CN102709294B - Non-volatile memory for improving data storage time and method for producing non-volatile memory - Google Patents
Non-volatile memory for improving data storage time and method for producing non-volatile memory Download PDFInfo
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Abstract
The invention relates to a non-volatile memory for improving the data storage time and a method for producing the non-volatile memory, wherein a memory cell is arranged at the inner upper part of a semiconductor baseplate of the non-volatile memory; the memory cell comprises a P-channel metal oxide semiconductor (PMOS) access transistor, a control capacitance and a programmable capacitance; a plurality of isolation grooves are arranged at the inner upper part of the semiconductor baseplate, and isolation dielectric is filled in the isolation grooves for forming domain dielectric areas; the PMOS access transistor, the control capacitance and the programmable capacitance which are arranged in the memory cell are isolated from each other through the domain dielectric areas; a gate dielectric layer is deposited on a first primary side of the semiconductor baseplate, and covers the openings of the isolation grooves and the first primary side of the semiconductor baseplate; and P plus floating gate electrodes are arranged at the two sides of the PMOS access transistor and the programmable capacitance, are positioned on the gate dielectric layer and correspond to the vertical angles of the corresponding isolation grooves. The non-volatile memory can be compatible to a complementary metal oxide semiconductors (CMOS) logic technology, the data retention time is prolonged, and the use reliability of the non-volatile memory is improved.
Description
Technical field
The present invention relates to a kind of non-volatility memory and preparation method thereof, especially a kind of non-volatility memory improving time data memory and preparation method thereof, belongs to the technical field of integrated circuit.
Background technology
For SOC (system on a chip) (SoC) application, it is that many functional blocks are integrated in an integrated circuit.The most frequently used SOC (system on a chip) comprises the logical block of a microprocessor or microcontroller, static RAM (SRAM) module, non-volatility memory and various specific function.But the process in traditional non-volatility memory, this uses folded grid or splitting bar memory cell usually, incompatible with traditional logic process.
Non-volatility memory (NVM) technique and traditional logic process are different.Non-volatility memory (NVM) technique and traditional logic process are combined, and become make technique into a more complicated and expensive combination; The typical usage of nonvolatile memory due to SoC application is little at the chip size being related to entirety, and therefore this way is worthless.Meanwhile, the operation principle due to existing non-volatility memory makes write data easily lose, the reliability that impact uses.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of non-volatility memory improving time data memory and preparation method thereof is provided, its compact conformation, can be compatible with CMOS logic process, improve data retention time, reduce use cost, improve the dependability of non-volatility memory.
According to technical scheme provided by the invention, the non-volatility memory of described raising time data memory, comprises semiconductor substrate, and the top in described semiconductor substrate is provided with some memory body cells for storing; Described memory body cell comprises PMOS access transistor, control capacitance and programming electric capacity; Top in described semiconductor substrate is provided with some isolated grooves, is provided with spacer medium to form field areas of dielectric in described isolated groove; Memory body intracellular PMOS access transistor, control capacitance and programming electric capacity are mutually isolated by field areas of dielectric; First interarea of semiconductor substrate is deposited with gate dielectric layer, and described gate dielectric layer covers the notch of isolated groove and covers the first interarea of semiconductor substrate; All arrange P+ floating gate electrode directly over the drift angle of PMOS access transistor, programming electric capacity both sides isolated groove, described P+ floating gate electrode is positioned on gate dielectric layer, and corresponding with the drift angle of corresponding isolated groove.
Described P+ floating gate electrode is the conductive polycrystalline silicon of P conduction type.
Arrange P+ floating gate electrode directly over the drift angle of described control capacitance both sides isolated groove, described P+ floating gate electrode is corresponding with the drift angle of control capacitance both sides isolated groove.
The material of described semiconductor substrate comprises silicon, and semiconductor substrate is P conduction type substrate or N conduction type substrate; When described semiconductor substrate is P conduction type substrate, described PMOS access transistor, control capacitance and programming electric capacity by the 3rd N-type region territory of the second N-type region territory in P-type conduction type of substrate and the second N-type overlying regions and P-type conduction type of substrate isolated.
Described gate dielectric layer is provided with floating gate electrode, described floating gate electrode covers and runs through gate dielectric layer corresponding above PMOS access transistor, control capacitance and programming electric capacity, the both sides of floating gate electrode are deposited with lateral protection layer, and lateral protection layer covers the sidewall of floating gate electrode; PMOS access transistor comprises the first N-type region territory and is positioned at P type source area and the P type drain region of described first N-type region territory internal upper part, and control capacitance comprises the second territory, p type island region and is positioned at a P type doped region and the 2nd P type doped region of described second territory, p type island region internal upper part; Programming electric capacity comprises the 3rd territory, p type island region and is positioned at the 5th P type doped region and the 6th P type doped region of described 3rd territory, p type island region internal upper part; One P type doped region, the 2nd P type doped region, the 5th P type doped region, the 6th P type doped region, P type source area and P type drain region are corresponding with the floating gate electrode of top, and contact with corresponding gate dielectric layer and field areas of dielectric respectively.
The material of described gate dielectric layer comprises silicon dioxide; Described lateral protection layer is silicon nitride or silicon dioxide.
The material of described floating gate electrode comprises the conductive polycrystalline silicon of N conduction type.
Improve a non-volatility memory preparation method for time data memory, the preparation method of described non-volatility memory comprises the steps:
A, provide semiconductor substrate, described semiconductor substrate comprises the first interarea and the second interarea;
B, on the first interarea of semiconductor substrate, carry out required barrier layer deposition, barrier etch and autoregistration ion implantation, to form the first required N-type region territory, the 3rd N-type region territory, the second territory, p type island region and the 3rd territory, p type island region in semiconductor substrate, first N-type region territory is positioned between the second territory, p type island region and the 3rd territory, p type island region, and the 3rd N-type region territory is positioned at the outside in the second territory, p type island region and the 3rd territory, p type island region;
C, in above-mentioned semiconductor substrate, carry out etching groove, to form required isolated groove in semiconductor substrate, and spacer medium is set in isolated groove, to form field areas of dielectric in semiconductor substrate, described field areas of dielectric from the first interarea to downward-extension, and make the 3rd N-type region territory, the second territory, p type island region, the first N-type region territory and the 3rd territory, p type island region top mutually isolated;
D, on the first interarea that above-mentioned semiconductor substrate is corresponding deposit gate dielectric layer, described gate dielectric layer covers the first interarea of semiconductor substrate;
E, on the first interarea of above-mentioned semiconductor substrate deposit floating gate electrode, described floating gate electrode to be covered on gate dielectric layer and to run through on gate dielectric layer corresponding above the second territory, p type island region, the first N-type region territory and the 3rd territory, p type island region;
F, on above-mentioned gate dielectric layer deposit the 4th barrier layer, and optionally shelter and etch the 4th barrier layer, to remove corresponding the 4th barrier layer covering floating gate electrode above the first N-type region territory, the second territory, p type island region and the 3rd territory, p type island region;
G, above above-mentioned 4th barrier layer autoregistration implanting p-type foreign ion, top in the second territory, p type island region obtains a P type lightly doped region and the 2nd P type lightly doped region, top in the first N-type region territory obtains the 3rd P type lightly doped region and the 4th P type lightly doped region, and the top in the 3rd territory, p type island region obtains the 5th P type lightly doped region and the 6th P type lightly doped region;
H, remove above-mentioned 4th barrier layer, and on the first interarea deposit lateral protection material, to form lateral protection layer in the both sides of floating gate electrode;
I, on above-mentioned first interarea deposit the 5th barrier layer, and optionally shelter and etch the 5th barrier layer, to remove the 5th barrier layer that above the second territory, p type island region, the first N-type region territory and the 3rd territory, p type island region, corresponding deposit covers;
J, above above-mentioned 5th barrier layer the foreign ion of autoregistration implanting p-type again, top in the second territory, p type island region obtains a P type heavily doped region and the 2nd P type heavily doped region, top in the first N-type region territory obtains the 3rd P type heavily doped region and the 4th P type heavily doped region, and the top in the 3rd P type heavily doped region obtains the 5th P type heavily doped region and the 6th P type heavily doped region;
K, the 5th barrier layer of removing on the first interarea;
L, above the first interarea of semiconductor substrate deposit P+ floating gate electrode material, and optionally shelter and etch P+ floating gate electrode material, all to form P+ floating gate electrode directly over the drift angle of PMOS access transistor, programming electric capacity both sides isolated groove.
When in described step a, when semiconductor substrate is P conduction type substrate, described step b comprises
B1, on the first interarea of P conduction type substrate deposit first barrier layer, and optionally shelter and etch described first barrier layer, above the first barrier layer, autoregistration injects N-type impurity ion, to obtain the second N-type region territory in semiconductor substrate;
B2, first barrier layer of removing on corresponding first interarea of above-mentioned P conduction type substrate, and on the first interarea deposit second barrier layer;
B3, optionally shelter and etch the second barrier layer, and N-type impurity ion is injected in autoregistration above the second barrier layer, to form the first N-type region territory and the 3rd N-type region territory in semiconductor substrate, the first N-type region territory and the 3rd N-type region territory are all positioned at the top in the second N-type region territory;
B4, second barrier layer of removing on corresponding first interarea of above-mentioned P conduction type substrate, and on the first interarea deposit the 3rd barrier layer;
B5, optionally shelter and etch the 3rd barrier layer, and above the 3rd barrier layer autoregistration implanting p-type foreign ion, to form the second territory, p type island region and the 3rd territory, p type island region at the second N-type overlying regions, by the first N-type region domain separation between the second territory, p type island region and the 3rd territory, p type island region.
When in described step a, when semiconductor substrate is N conduction type substrate, described step b comprises
S1, on the first interarea deposit second barrier layer, and optionally shelter and etch the second barrier layer;
S2, above above-mentioned second barrier layer autoregistration inject N-type impurity ion, obtain the first required N-type region territory and the second N-type region territory with the top in N conduction type substrate;
S3, second barrier layer of removing on the first interarea, and on the first interarea deposit the 3rd barrier layer;
S4, optionally shelter and etch the 3rd barrier layer, and above the 3rd barrier layer autoregistration implanting p-type foreign ion, to obtain the second territory, p type island region and the 3rd territory, p type island region in N conduction type substrate.
Advantage of the present invention: the top in semiconductor substrate is provided with some isolated grooves, be provided with spacer medium in described isolated groove to form field areas of dielectric, memory body intracellular PMOS access transistor, control capacitance and programming electric capacity are mutually isolated by field areas of dielectric, P+ floating gate electrode is provided with directly over the drift angle of isolated groove, described P+ floating gate electrode is positioned on gate dielectric layer, and distribution corresponding with the drift angle of isolated groove, the width of P+ floating gate electrode can block the thinner oxide layer in drift angle place completely, P+ floating gate electrode is the conductive polycrystalline silicon of P conduction type, electronics on P+ floating gate electrode is few son, like this when non-volatility memory store electrons, due to the existence of P+ floating gate electrode, electronics is difficult to be leaked electricity by the oxide layer at drift angle place again, thus improve the time data memory of non-volatility memory, compact conformation, can be compatible with CMOS logic process, reduce use cost, improve the dependability of non-volatility memory.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the embodiment of the present invention 2.
Fig. 3 ~ Figure 14 is the concrete implementing process cutaway view of the embodiment of the present invention 1, wherein:
Fig. 3 is the cutaway view that the present invention adopts P conduction type substrate.
Fig. 4 is the cutaway view after the present invention obtains the second N-type region territory.
Fig. 5 is the cutaway view after the present invention obtains the first N-type region territory and the 3rd N-type region territory.
Fig. 6 is the cutaway view after the present invention obtains the second territory, p type island region and the 3rd territory, p type island region.
Fig. 7 is the cutaway view after the present invention obtains field areas of dielectric.
Fig. 8 is the cutaway view after the present invention obtains gate dielectric layer.
Fig. 9 is the cutaway view after the present invention obtains floating gate electrode.
Figure 10 is the cutaway view after autoregistration of the present invention injection P foreign ion obtains lightly doped region.
Figure 11 is the cutaway view after the present invention obtains lateral protection layer.
Figure 12 is the cutaway view after autoregistration of the present invention injection P foreign ion obtains heavily doped region.
Figure 13 is the cutaway view after the present invention removes the 5th barrier layer.
Figure 14 is the cutaway view after the present invention obtains P+ floating gate electrode.
Figure 15 ~ Figure 25 is the concrete implementing process cutaway view of the embodiment of the present invention 2, wherein:
Figure 15 is the cutaway view of the N conduction type substrate that the present invention adopts.
Figure 16 is the cutaway view after the present invention obtains the first N-type region territory and the second N-type region territory.
Figure 17 is the cutaway view after the present invention obtains the second territory, p type island region and the 3rd territory, p type island region.
Figure 18 is the cutaway view after the present invention obtains field areas of dielectric.
Figure 19 is the cutaway view after the present invention obtains gate dielectric layer.
Figure 20 is the cutaway view after the present invention obtains floating gate electrode.
Figure 21 is the cutaway view after autoregistration of the present invention injection P foreign ion obtains lightly doped region.
Figure 22 is the cutaway view after the present invention obtains lateral protection layer.
Figure 23 is the cutaway view after autoregistration of the present invention injection P foreign ion obtains heavily doped region.
Figure 24 is the cutaway view after the present invention removes the 5th barrier layer.
Figure 25 is the cutaway view after the present invention obtains P+ floating gate electrode.
Description of reference numerals: 1-P conduction type substrate, 2-first N-type region territory, 3-second N-type region territory, 4-the 3rd N-type region territory, territory, 5-second p type island region, 6-the one P type doped region, 7-the one P type heavily doped region, 8-the one P type lightly doped region, 9-the 2nd P type doped region, 10-isolated groove, 11-the 2nd P type lightly doped region, 12-the 2nd P type heavily doped region, 13-P type source area, 14-field areas of dielectric, 15-gate dielectric layer, 16-floating gate electrode, 17-lateral protection layer, 18-the 3rd P type lightly doped region, 19-the 3rd P type heavily doped region, 20-P+ floating gate electrode, 21-P type drain region, 22-the 4th P type lightly doped region, 23-the 4th P type heavily doped region, 24-the 5th P type doped region, 25-the 5th P type heavily doped region, 26-the 5th P type lightly doped region, 27-the 6th P type doped region, 28-the 6th P type lightly doped region, 29-the 6th P type heavily doped region, 30-drift angle, 31-the 3rd territory, p type island region, 32-first interarea, 33-second interarea, 34-first barrier layer, 35-second barrier layer, 36-the 3rd barrier layer, 37-the 4th barrier layer, 38-the 5th barrier layer, 39-N conduction type substrate, 100-memory body cell, 110-PMOS access transistor, 120-control capacitance and 130-programming electric capacity.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Usually, non-volatility memory comprises semiconductor substrate, top in described semiconductor substrate is provided with some memory body cells 100 for storing, described memory body cell 100 comprises PMOS access transistor 110, control capacitance 120 and programming electric capacity 130, and described PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 are by the field areas of dielectric isolation 14 on semiconductor substrate top.In CMOS logic process, in order to the size of non-volatility memory can be reduced, when forming field areas of dielectric 14, generally first by etching groove, then in groove, grow oxide layer.When etching formation groove, groove has drift angle 30, and from the cross section of non-volatility memory, drift angle 30 is positioned at the edge of groove notch, and drift angle 30 generally has certain gradient.When growing oxide layer in groove, due to the existence of drift angle 30, the oxidated layer thickness at drift angle 30 place of groove is all thinner than the oxide layer of other positions of groove; When being carried out data by non-volatility memory and storing, due to the oxide layer that drift angle 30 place is thinner, electronic energy in non-volatility memory is leaked electricity through thinner oxide layer, namely make the requirement that the data retention time of non-volatility memory can not reach required, reduce the reliability that non-volatility memory stores data.Store the retention time of data to improve non-volatility memory, below by embodiment 1 and embodiment 2, the present invention will be described.
Embodiment 1
As shown in Fig. 1 with Figure 13: in order to non-volatility memory can be made mutually compatible with CMOS logic process, non-volatility memory can be made can to store the longer time simultaneously, the material that non-volatility memory comprises P conduction type substrate 1, P conduction type substrate 1 is silicon.Top in P conduction type substrate 1 is provided with at least one memory body cell 100, described memory body cell 100 comprises PMOS access transistor 110, control capacitance 120 and programming electric capacity 130, on the surface of P conduction type substrate 1, deposit is coated with gate dielectric layer 15, described gate dielectric layer 15 covers the corresponding surface forming memory body cell 100, mutually isolated by the field areas of dielectric 14 in P conduction type substrate 1 between PMOS access transistor 110, control capacitance 120 and programming electric capacity 130.Field areas of dielectric 14 is positioned at the isolated groove 10 of P conduction type substrate 1, described isolated groove 10 is positioned at the top of P conduction type substrate 1, from the first interarea 32 of P conduction type substrate 1 to downward-extension, obtain field areas of dielectric 14 by growing gate oxide in isolated groove 10, the material of described field areas of dielectric 14 is generally silicon dioxide.As the above analysis, the oxidated layer thickness at drift angle 30 place of isolated groove 10 is thinner than the oxidated layer thickness of other positions of isolated groove 10.
In order to improve the data retention time of non-volatility memory in the present invention, directly over the drift angle 30 of PMOS access transistor 110, programming electric capacity 130 both sides isolated groove 10, P+ floating gate electrode 20 is all set, described P+ floating gate electrode 20 is positioned on gate dielectric layer 15, and the distribution corresponding with drift angle 30 of the width of P+ floating gate electrode 20, specifically namely the width of P+ floating gate electrode 20 can block the thinner oxide layer in drift angle 30 place completely.P+ floating gate electrode 20 is the conductive polycrystalline silicon of P conduction type, electronics on P+ floating gate electrode 20 is few son, like this when non-volatility memory store electrons, due to the existence of P+ floating gate electrode 20, electronics is difficult to be leaked electricity by the oxide layer at drift angle 30 place again, thus improves the time data memory of non-volatility memory.
In embodiments of the present invention, in order to the time data memory of non-volatility memory can be improved further, directly over the drift angle 30 of control capacitance 120 both sides isolated groove 10, P+ floating gate electrode 20 is all set, described P+ floating gate electrode 20 is corresponding with the drift angle 30 of control capacitance 120 both sides isolated groove 10, to cover corresponding drift angle 30.In the embodiment of the present invention, in the cross section of non-volatility memory of the present invention, the drift angle 30 of described PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 both sides isolated groove 10 refers to drift angle 30 region of floating gate electrode 16 both sides.Simultaneously, on the cross section of non-volatility memory of the present invention, outside memory body cell 100 isolated groove 10 drift angle 30 directly over also P+ floating gate electrode 20 can be set, in embodiment of the present invention accompanying drawing, the P+ floating gate electrode 20 in the outside of memory body cell 100 refers to the P+ floating gate electrode 20 at two ends, left and right; After above-mentioned setting, all to arrange P+ floating gate electrode 20 directly over the drift angle 30 being formed in each isolated groove 20, the data retention time of non-volatility memory can be improved further.
Gate dielectric layer 15 is deposited with floating gate electrode 16, described floating gate electrode 16 is covered on gate dielectric layer 15, and run through the gate dielectric layer 15 covering PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 correspondence, thus PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 are interconnected cooperation.The both sides of floating gate electrode 16 are coated with lateral protection layer 17, and described lateral protection layer 17 covers the outer wall surface of floating gate electrode 16 correspondence.In the top plan view of the non-volatility memory of the embodiment of the present invention, P+ floating gate electrode 20 contacts with floating gate electrode 16.
Described PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 are by the P conductivity regions domain separation in the 3rd N-type region territory 4 in outside and the second N-type region territory 3 of below and P conduction type substrate 1, and the P conductive region in P conduction type substrate 1 forms the first territory, p type island region.The material of floating gate electrode 16 comprises conductive polycrystalline silicon, and gate dielectric layer 15 is silicon dioxide, and lateral protection layer 17 is silicon dioxide or silicon nitride; Field areas of dielectric 14 is silicon dioxide.
Described PMOS access transistor 110 comprises the first N-type region territory 2, top in described first N-type region territory 2 is provided with symmetrical P type source area 13 and P type drain region 21, and described P type source area 13, P type drain region 21 contact with the gate dielectric layer 15 of corresponding field areas of dielectric 14 and top.P type source area 13 comprises the 3rd P type lightly doped region 18 and the 3rd P type heavily doped region 19, and the doping content of described 3rd P type heavily doped region 19 is greater than the doping content of the 3rd P type lightly doped region 18.P type drain region 21 comprises the 4th P type lightly doped region 22 and the 4th P type heavily doped region 23, and the doping content of described 4th P type heavily doped region 23 is greater than the doping content of the 4th P type lightly doped region 22.3rd P type lightly doped region 18 and the 4th P type lightly doped region 22 are same fabrication layer, and the 3rd P type heavily doped region 19 and the 4th P type heavily doped region 23 are same fabrication layer.3rd P type lightly doped region 18 contacts with the 3rd P type heavily doped region 19, and contacted with field areas of dielectric 14 by the 3rd P type heavily doped region 19, the width that the 3rd P type lightly doped region 18 extends in the first N-type region territory 2 is consistent with the thickness of lateral protection layer 17; Meanwhile, the setting of the 4th P type lightly doped region 22 arranges identical with the distribution of the 3rd P type lightly doped region 18.
Control capacitance 120 comprises the second territory, p type island region 5, and the top in described second territory, p type island region 5 is provided with P type doped region 6 and a 2nd P type doped region 9; A described P type doped region 6 and the 2nd P type doped region 9 are symmetrically distributed in the second territory, p type island region 5.One P type doped region 9, P type doped region the 6, the 2nd contacts with corresponding field areas of dielectric 14 and gate dielectric layer 15.One P type doped region 6 comprises P type lightly doped region 8 and a P type heavily doped region 7; one P type lightly doped region 8 is contacted with field areas of dielectric 14 by a P type heavily doped region 7, and the extended distance of a P type lightly doped region 8 in the second territory, p type island region 5 is consistent with the thickness of lateral protection layer 17.2nd P type doped region 9 comprises the 2nd P type lightly doped region 11 and the 2nd P type heavily doped region 12, described 2nd P type lightly doped region 11 is contacted with field areas of dielectric 14 by the 2nd P type heavily doped region 12, and the 2nd P type lightly doped region 11 arranges consistent with the distribution of a P type lightly doped region 8.Capacitance structure is formed, i.e. control capacitance 120 between the second territory, p type island region 5 below floating gate electrode 16 and gate dielectric layer 15 and gate dielectric layer 15.In like manner, also capacitance structure is formed, electric capacity 130 of namely programming between the 3rd territory, p type island region 31 below floating gate electrode 16 and gate dielectric layer 15 and gate dielectric layer 15.
Programming electric capacity 130 comprises the 3rd territory, p type island region 31, and the top in described 3rd territory, p type island region 31 is provided with the 5th P type doped region 24 and the 6th P type doped region 27, and described 5th P type doped region 24 and the 6th P type doped region 27 are symmetrically distributed in the 3rd territory, p type island region 31.5th P type doped region 24 comprises the 5th P type lightly doped region 26 and the 5th P type heavily doped region 25; the doping content of the 5th P type heavily doped region 25 is greater than the doping content of the 5th P type lightly doped region 26; 5th P type lightly doped region 26 is contacted with field areas of dielectric 14 by the 5th P type heavily doped region 25, and the extended distance of the 5th P type lightly doped region 26 in the 3rd territory, p type island region 31 is consistent with the thickness of lateral protection layer 17.6th P type doped region 27 comprises the 6th P type lightly doped region 28 and the 6th P type heavily doped region 29,6th P type lightly doped region 28 is contacted with field areas of dielectric 14 by the 4th N-type lightly doped region 29, and the 6th P type lightly doped region 28 arranges consistent with the distribution of the 5th P type lightly doped region 26.5th P type lightly doped region 26 and the 6th P type lightly doped region 28 are same fabrication layer, and the 5th P type heavily doped region 25 and the 6th P type heavily doped region 29 are same fabrication layer.
Write data can be carried out to memory body cell 100 by programming electric capacity 130, or by the data erase in memory body cell 100; The storing data state in memory body cell 100 can be read by PMOS access transistor 110, magnitude of voltage can be passed on floating gate electrode 16 by control capacitance 120, realize magnitude of voltage between floating gate electrode 16 and programming electric capacity 130, data write, erasing and read operation can be realized according to corresponding magnitude of voltage.
As shown in Fig. 3 ~ Figure 13: the non-volatility memory of said structure can be realized by following processing step, particularly:
A, provide P conduction type substrate 1, described P conduction type substrate 1 comprises the first interarea 32 and the second interarea 33; As shown in Figure 3: described P conduction type substrate 1 and stand CMOS are prepared and required compatible consistent mutually, and the material of P conduction type substrate 1 can select conventional silicon, and the first interarea 32 is corresponding with the second interarea 33;
B, on the first interarea 32 of P conduction type substrate 1, carry out required barrier layer deposition, barrier etch and autoregistration ion implantation, with the first N-type region territory 2 in P conduction type substrate 1 needed for formation, the 3rd territory, p type island region 5, N-type region territory 4, second and the 3rd territory, p type island region 31, first N-type region territory 2 is positioned between the second territory, p type island region 5 and the 3rd territory, p type island region 31, and the 3rd N-type region territory 4 is positioned at the outside in the second territory, p type island region 5 and the 3rd territory, p type island region 31;
As shown in Fig. 4 ~ Fig. 6, forming process is particularly:
B1, on the first interarea 32 of P conduction type substrate 1 deposit first barrier layer 34, and optionally shelter and etch described first barrier layer 34, above the first barrier layer 34, autoregistration injects N-type impurity ion, to obtain the second N-type region territory 3 in P conduction type substrate 1; As shown in Figure 4, described first barrier layer 34 is silicon dioxide or silicon nitride; When behind deposit first barrier layer 34 on the first interarea 32, by etching the first barrier layer 34 of central area, after N-type impurity ion is injected in autoregistration, the second N-type region territory 3 can be obtained in P conduction type substrate 1; Described N-type impurity ion is foreign ion conventional in semiconductor technology, by controlling dosage and the energy of N-type impurity ion implantation, can form the second required N-type region territory 3;
B2, first barrier layer 34 of removing on corresponding first interarea 32 of above-mentioned P conduction type substrate 1, and on the first interarea 32 deposit second barrier layer 35;
B3, optionally shelter and etch the second barrier layer 35, and N-type impurity ion is injected in autoregistration above the second barrier layer 35, to form the top that the first N-type region territory 2 and the 3rd N-type region territory 2, N-type region territory 4, first and the 3rd N-type region territory 4 are all positioned at the second N-type region territory 3 in semiconductor substrate 1; As shown in Figure 5: after optionally sheltering and etch the second barrier layer 35, etch away needing the second barrier layer 35 corresponding above formation first N-type region territory 2 and the 3rd N-type region territory 4, when after injection N-type impurity ion, the outside in the first N-type region territory 2 and the 3rd N-type region territory, N-type region territory the 4, three 4 and the first N-type region territory 2 can be formed;
B4, second barrier layer 35 of removing on corresponding first interarea 32 of above-mentioned P conduction type substrate 1, and on the first interarea 32 deposit the 3rd barrier layer 36;
B5, optionally shelter and etch the 3rd barrier layer 36, and above the 3rd barrier layer 36 autoregistration implanting p-type foreign ion, to form the second territory, p type island region 5 and isolated by the first N-type region territory 2 between the 3rd territory, p type island region 5, territory, p type island region 31, second and the 3rd territory, p type island region 31 above the second N-type region territory 3;
As shown in Figure 6: during etching the 3rd barrier layer 36, the 3rd barrier layer 36 corresponding above the second territory, p type island region 5 and the 3rd territory, p type island region 31 is removed, when after autoregistration implanting p-type foreign ion, the second territory, p type island region 5 and the 3rd territory, p type island region 31 can be formed;
C, in above-mentioned semiconductor substrate, carry out etching groove, to form required isolated groove 10 in semiconductor substrate, and spacer medium is set in isolated groove 10, to form field areas of dielectric 14 in semiconductor substrate, described field areas of dielectric 14 from the first interarea 32 to downward-extension, and makes the top in the 3rd N-type region territory 2, territory, p type island region 5, first, N-type region territory 4, second and the 3rd territory, p type island region 31 mutually isolated;
As shown in Figure 7: field areas of dielectric 14 is silicon dioxide, can be obtained in the growth of isolated groove 10 internal heating oxidation by conventional;
D, on the first interarea 32 of above-mentioned P conduction type substrate 1 correspondence deposit gate dielectric layer 15, described gate dielectric layer 15 covers the first interarea 32 of semiconductor substrate 1; As shown in Figure 8: described gate dielectric layer 15 is silicon dioxide, and gate dielectric layer 15 is covered in the surface of field areas of dielectric 14 and semiconductor substrate 1 correspondence;
E, on the first interarea 32 of above-mentioned P conduction type substrate 1 deposit floating gate electrode 16, described floating gate electrode 16 to be covered on gate dielectric layer 15 and to run through on gate dielectric layer 15 corresponding above the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31; As shown in Figure 9: floating gate electrode 16 corresponding above the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31 in figure is same fabrication layer, and is interconnected integral; Herein in order to structure of the present invention can be shown, the interval method of analysing and observe is adopted to obtain cutaway view of the present invention; Floating gate electrode 16 is in T shape on gate dielectric layer 15;
F, on above-mentioned gate dielectric layer 15 deposit the 4th barrier layer 37, and optionally shelter and etch the 4th barrier layer 37, remove corresponding the 4th barrier layer 37 covering floating gate electrode 16 above the first territory, p type island region 5, N-type region territory 2, second and the 3rd territory, p type island region 31;
G, above above-mentioned 4th barrier layer 37 autoregistration implanting p-type foreign ion, top in the second territory, p type island region 5 obtains P type lightly doped region 8 and a 2nd P type lightly doped region 11, top in the first N-type region territory 2 obtains the 3rd P type lightly doped region 18 and the 4th P type lightly doped region 22, and the top in the 3rd territory, p type island region 31 obtains the 5th P type lightly doped region 26 and the 6th P type lightly doped region 28; As shown in Figure 10: the 4th barrier layer 37 is silicon dioxide or silicon nitride; After optionally sheltering and etch the 4th barrier layer 37, make corresponding region except the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31 all can stop in p type impurity ion implantation P-type conduction type of substrate 1; Adopt conventional autoregistration implanting p-type foreign ion, required P type lightly doped region can be obtained simultaneously;
H, remove above-mentioned 4th barrier layer 37, and on the first interarea 32 deposit lateral protection material, to form lateral protection layer 17 in the both sides of floating gate electrode 16; As shown in figure 11: the material of described lateral protection layer 17 is silica or silicon dioxide, can at the heavily doped region needed for being formed by lateral protection layer 17, can make simultaneously corresponding lightly doped region and lateral protection layer 17 corresponding to the same;
I, on above-mentioned first interarea 32 deposit the 5th barrier layer 38, and optionally shelter and etch the 5th barrier layer 38, to remove the 5th barrier layer 38 that above the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31, corresponding deposit covers; Deposit is also optionally sheltered and etches the 5th barrier layer 38, mainly avoids when forming heavily doped region, avoids in ion implantation P-type conduction type of substrate 1 other regions interior; 5th barrier layer 38 is silicon dioxide or silicon nitride;
J, above above-mentioned 5th barrier layer 38 foreign ion of autoregistration implanting p-type again, top in the second territory, p type island region 5 obtains P type heavily doped region 7 and a 2nd P type heavily doped region 12, top in the first N-type region territory 2 obtains the 3rd P type heavily doped region 19 and the 4th P type heavily doped region 23, and the top in the 3rd P type heavily doped region 31 obtains the 5th P type heavily doped region 25 and the 6th P type heavily doped region 29; As shown in figure 12: the concentration of described autoregistration implanting p-type foreign ion is greater than the ion concentration of step g, owing to there being the stop on the 5th barrier layer 38 and lateral protection layer 17, can make to form heavily doped region in the position of corresponding formation lightly doped region, and the lightly doped region retained can be consistent with lateral protection layer 17, thus obtain required single polycrystalline architecture;
K, the 5th barrier layer 38 of removing on the first interarea 32.As shown in figure 13: remove the 5th barrier layer 38, obtain required non-volatility memory.
L, on above-mentioned gate dielectric layer 15 deposit P+ floating gate electrode material, and optionally shelter and etch P+ floating gate electrode material, all to form P+ floating gate electrode 20 as shown in figure 14 directly over the drift angle 30 of PMOS access transistor 110, programming electric capacity 130 both sides isolated groove 10.
Embodiment 2
As shown in Fig. 2 and Figure 25: in the present embodiment, semiconductor substrate is N conduction type substrate 39, when after employing N conduction type substrate 39, the second N-type region territory 3 need not be formed in N conduction type substrate 39, namely the second territory, p type island region 5 and the 3rd territory, p type island region 31 directly contact with N-type conduction type substrate 39, meanwhile, the first N-type region territory 2 and the 3rd N-type region territory 4 also directly contact with N conduction type substrate 39.Adopt all the other structures after N conduction type substrate 39 all identical with arranging of embodiment 1.
As shown in Figure 15 ~ Figure 25: the non-volatility memory of said structure can be realized by following processing step, particularly:
A, provide N conduction type substrate 39, described N conduction type substrate 39 comprises the first interarea 32 and the second interarea 33; As shown in figure 15, the material of N conduction type substrate 39 can be silicon;
B, on the first interarea 32 of semiconductor substrate, carry out required barrier layer deposition, barrier etch and autoregistration ion implantation, to form the first required N-type region territory 2, the 3rd territory, p type island region 5, N-type region territory 4, second and the 3rd territory, p type island region 31 in semiconductor substrate, first N-type region territory 2 is positioned between the second territory, p type island region 5 and the 3rd territory, p type island region 31, and the 3rd N-type region territory 4 is positioned at the outside in the second territory, p type island region 5 and the 3rd territory, p type island region 31;
The forming process of step b can be divided into:
S1, on the first interarea 32 deposit second barrier layer 35, and optionally shelter and etch the second barrier layer 35;
S2, above above-mentioned second barrier layer 35 autoregistration inject N-type impurity ion, obtain the first required N-type region territory 2 and the second N-type region territory 4 with the top in N conduction type substrate 39, as shown in figure 16;
S3, second barrier layer 35 of removing on the first interarea 32, and on the first interarea 32 deposit the 3rd barrier layer 36;
S4, optionally shelter and etch the 3rd barrier layer 36, and above the 3rd barrier layer 36 autoregistration implanting p-type foreign ion, to obtain the second territory, p type island region 5 and the 3rd territory, p type island region 31 in N conduction type substrate 39, as shown in figure 17;
C, in above-mentioned semiconductor substrate, carry out etching groove, to form required isolated groove 10 in semiconductor substrate, and spacer medium is set in isolated groove 10, to form field areas of dielectric 14 in semiconductor substrate, described field areas of dielectric 14 from the first interarea 32 to downward-extension, and makes the top in the 3rd N-type region territory 2, territory, p type island region 5, first, N-type region territory 4, second and the 3rd territory, p type island region 31 mutually isolated; As shown in figure 18;
D, on the first interarea 32 that above-mentioned semiconductor substrate is corresponding deposit gate dielectric layer 15, described gate dielectric layer 15 covers the first interarea 32 of semiconductor substrate 1, as shown in figure 19;
E, on the first interarea 32 of above-mentioned semiconductor substrate deposit floating gate electrode 16, described floating gate electrode 16 to be covered on gate dielectric layer 15 and to run through on gate dielectric layer 15 corresponding above the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31, as shown in figure 20;
F, on above-mentioned gate dielectric layer 15 deposit the 4th barrier layer 37, and optionally shelter and etch the 4th barrier layer 37, remove corresponding the 4th barrier layer 37 covering floating gate electrode 16 above the first territory, p type island region 5, N-type region territory 2, second and the 3rd territory, p type island region 31;
G, above above-mentioned 4th barrier layer 37 autoregistration implanting p-type foreign ion, top in the second territory, p type island region 5 obtains P type lightly doped region 8 and a 2nd P type lightly doped region 11, top in the first N-type region territory 2 obtains the 3rd P type lightly doped region 18 and the 4th P type lightly doped region 22, and the top in the 3rd territory, p type island region 31 obtains the 5th P type lightly doped region 26 and the 6th P type lightly doped region 28, as shown in figure 21;
H, remove above-mentioned 4th barrier layer 37, and on the first interarea 32 deposit lateral protection material, to form lateral protection layer 17 in the both sides of floating gate electrode 16, as shown in figure 22;
I, on above-mentioned first interarea 32 deposit the 5th barrier layer 38, and optionally shelter and etch the 5th barrier layer 38, to remove the 5th barrier layer 38 that above the second N-type region territory 2, territory, p type island region 5, first and the 3rd territory, p type island region 31, corresponding deposit covers;
J, above above-mentioned 5th barrier layer 38 foreign ion of autoregistration implanting p-type again, top in the second territory, p type island region 5 obtains P type heavily doped region 7 and a 2nd P type heavily doped region 12, top in the first N-type region territory 2 obtains the 3rd P type heavily doped region 19 and the 4th P type heavily doped region 23, and the top in the 3rd P type heavily doped region 31 obtains the 5th P type heavily doped region 25 and the 6th P type heavily doped region 29, as shown in figure 23;
K, the 5th barrier layer 38 of removing on the first interarea 32, as shown in figure 24.
L, on above-mentioned gate dielectric layer 15 deposit P+ floating gate electrode material, and optionally shelter and etch P+ floating gate electrode material, all to form P+ floating gate electrode 20 directly over the drift angle 30 of PMOS access transistor 110, programming electric capacity 130 both sides isolated groove 10, as shown in figure 25.
In foregoing description, the embodiment of the present invention all comprises PMOS access transistor 110 with memory body cell 100, the structure of control capacitance 120 and programming electric capacity 130, PMOS access transistor 110, control capacitance 110 and programming electric capacity 120 all mutually isolated by field areas of dielectric 14, the art personnel are known, when in the process preparing memory body cell 100, in isolated groove 10 during the areas of dielectric 14 of formation field, all P+ floating gate electrode 20 can be set at the drift angle 30 of isolated groove 10, namely except the structure of the memory body cell 100 of the present invention's description, the method that the memory body cell 100 of all the other structures also can utilize the present invention to arrange P+ floating gate electrode 20 improves data retention time.Memory body cell 100 structure of all the other structures is known by the art personnel, and the structure that memory body cell 100 structure of all the other structures utilizes the present invention to arrange P+ floating gate electrode 20 formation will not enumerate description herein.
Meanwhile, during foregoing description non-volatility memory, all comprise the structure of PMOS access transistor 110, control capacitance 120 and programming electric capacity 130 to describe complete preparation process with memory body cell 100.When the memory body cell 100 of non-volatility memory adopts other structures, adopt the implementation step with CMOS logic process compatibility, as long as prepare on a semiconductor substrate in memory body cell processes and form isolated groove 10, and in isolated groove 10, grow spacer medium formation field areas of dielectric 14, isolated the transistor AND gate electric capacity in memory body cell 100 by field areas of dielectric 14, memory body cell 100 preparation process of all the other structures no longer describes in detail herein.
As shown in Fig. 1 and Figure 14: for single memory body cell 100, it can realize the write of single binary data, reading and erasing.Below by single memory body cell 100 is write, reads and erase process so that the working mechanism of nonvolatile memory of the present invention to be described.When needs write input according to time, territory, p type island region voltage in P conduction type substrate 1 is set to 0 current potential all the time, first N-type region territory 3, N-type region territory 2, second and the 3rd N-type region territory 4 all set 5 current potentials, second territory, p type island region 5 is set 0 current potential also, the voltage of the 3rd territory, p type island region 31 is-5V, programming the 5th P type doped region 24 of electric capacity 130 and the equal set of the voltage-5V of the 6th P type doped region 27, P type doped region 6 and the 2nd equal set 5V in P type doped region 9 of control capacitance 120; Due to the transmission effect of control capacitance 120, can the magnitude of voltage of 5V be delivered on floating gate electrode 16, floating gate electrode 16 produces the magnitude of voltage of 4 ~ 5V, magnitude of voltage now between floating gate electrode 16 and the 3rd territory, p type island region 31 is 9 ~ 10V, field emission characteristic will be reached also referred to as FN(Fowler-Nordheim) electric field needed for tunnel effect, electronics will be arrived in floating gate electrode 16 by gate dielectric layer 15, realizes the write of data.Owing to being completely cut off by gate dielectric layer 15 below floating gate electrode 16, side is completely cut off by lateral protection layer 17, and therefore electronic energy can retain for a long time in floating gate electrode 16.
When needing to wipe the data in memory body cell 100, territory, p type island region voltage in P conduction type substrate 1 is set to 0 current potential all the time, first N-type region territory 2, the voltage equal set 5V voltage in the second N-type region territory 3 and the 3rd N-type region territory 4, voltage set-the 5V of the second territory, p type island region 5, one P type doped region 6, the equal set of the voltage-5V of the 2nd P type doped region 9, the voltage set 5V of the 3rd territory, p type island region 31, 5th P type doped region 24 and the 6th equal set 5V voltage in P type doped region 27, under control capacitance 120 acts on, the voltage producing-4V ~-5V in floating gate electrode 16 can be made, magnitude of voltage now between floating gate electrode 16 and the 3rd territory, p type island region 31 is-9 ~-10V, field emission characteristic will be reached also referred to as FN(Fowler-Nordheim) electric field needed for tunnel effect, electrons enters in the 3rd territory, p type island region 31 by gate dielectric layer 15, thus realize data erase in floating gate electrode 16.
When needing to read the data in memory body cell 100, territory, p type island region voltage in P conduction type substrate 1 is set to 0 current potential all the time, the voltage equal set 5V voltage in the first N-type region territory 3, N-type region territory 2, second and the 3rd N-type region territory 4, second territory, p type island region 5 set-1V, one P type doped region 6 and the 2nd equal set-1V in P type doped region 9, PMOS access transistor source area 13 and the equal set 0.5V in PMOS access transistor drain region 21,3rd territory, p type island region 31 set 5V voltage, the 5th P type doped region 24 and the 6th equal set 5V voltage in P type doped region 27.When after the above-mentioned magnitude of voltage of loading, when writing data in memory body cell 100, have a large amount of electronics in floating gate electrode 16, when in memory body cell 100, data are wiped free of, electronics flows out in floating gate electrode 16; When there being electronics in floating gate electrode 16, larger by the electric current of PMOS access transistor source area 13, when electronics flows out in floating gate electrode 16, less by the electric current of PMOS access transistor source area 13, thus according to the size of phase induced current, can know that memory body cell 100 is write data modes or is in data erase state.
Because in corresponding P+ region in a P type doped region 9, P type doped region the 6, the 2nd, P type source area 13, P type doped region, P type drain region the 21, the 5th 24 and the 6th P type doped region 27, transportable anion (electronics) is few son, more of a specified duration when what the data sucked were managed like this, store when using more safe and reliable.
Simultaneously, directly over the drift angle 30 of isolated groove 10, P+ floating gate electrode 20 is set, P+ floating gate electrode 20 is the conductive polycrystalline silicon of P conduction type, electronics on P+ floating gate electrode 20 is few son, like this when non-volatility memory store electrons, due to the existence of P+ floating gate electrode 20, electronics is difficult to be leaked electricity by the oxide layer at drift angle 30 place again, thus further increases the time data memory of non-volatility memory.
As shown in Fig. 2 and Figure 23: the non-volatility memory of the single polycrystalline architecture adopting N conduction type substrate 39 correspondence to be formed, when needing write, the erasing carried out and read, need corresponding on-load voltage, to realize corresponding write, erasing and read operation.Particularly, when corresponding write, erasing and the voltage-drop loading read operate with the non-volatility memory of the corresponding single polycrystalline architecture formed of employing P conduction type substrate 1, voltage is consistent, no longer describes in detail herein.
Top in semiconductor substrate of the present invention is provided with some isolated grooves 10, be provided with spacer medium in described isolated groove 10 to form field areas of dielectric 14, the PMOS access transistor 110 in memory body cell 100, control capacitance 120 and programming electric capacity 130 are mutually isolated by field areas of dielectric 14, P+ floating gate electrode 20 is provided with directly over the drift angle 30 of isolated groove 10, described P+ floating gate electrode 20 is positioned on gate dielectric layer 15, and with the corresponding distribution of drift angle 30 of isolated groove 10, the width of P+ floating gate electrode 20 can block the thinner oxide layer in drift angle 30 place completely, P+ floating gate electrode 20 is the conductive polycrystalline silicon of P conduction type, electronics on P+ floating gate electrode 20 is few son, like this when non-volatility memory store electrons, due to the existence of P+ floating gate electrode 20, electronics is difficult to be leaked electricity by the oxide layer at drift angle 30 place again, thus improve the time data memory of non-volatility memory.
Claims (2)
1. improve a non-volatility memory for time data memory, comprise semiconductor substrate, the top in described semiconductor substrate is provided with some memory body cells (100) for storing; Described memory body cell (100) comprises PMOS access transistor (110), control capacitance (120) and programming electric capacity (130); It is characterized in that: the top in described semiconductor substrate is provided with some isolated grooves (10), be provided with spacer medium in described isolated groove (10) to form field areas of dielectric (14); PMOS access transistor (110) in memory body cell (100), control capacitance (120) and programming electric capacity (130) are mutually isolated by field areas of dielectric (14); First interarea (32) of semiconductor substrate is deposited with gate dielectric layer (15), and described gate dielectric layer (15) covers the notch of isolated groove (10) and covers first interarea (32) of semiconductor substrate; Directly over the drift angle (30) of PMOS access transistor (110), programming electric capacity (130) both sides isolated groove (10), P+ floating gate electrode (20) is all set, described P+ floating gate electrode (20) is positioned on gate dielectric layer (15), and corresponding with the drift angle (30) of corresponding isolated groove (10);
The conductive polycrystalline silicon that described P+ floating gate electrode (20) is P conduction type;
Arrange P+ floating gate electrode (20) directly over the drift angle (30) of described control capacitance (120) both sides isolated groove (10), described P+ floating gate electrode (20) is corresponding with the drift angle (30) of control capacitance (120) both sides isolated groove (10);
The material of described semiconductor substrate comprises silicon, and semiconductor substrate is P conduction type substrate (1) or N conduction type substrate (39); When described semiconductor substrate is P conduction type substrate (1), described PMOS access transistor (110), control capacitance (120) and programming electric capacity (130) are isolated with P-type conduction type of substrate (1) by the 3rd N-type region territory (4) of the second N-type region territory (3) in P-type conduction type of substrate (1) and top, the second N-type region territory (3);
Described gate dielectric layer (15) is provided with floating gate electrode (16), described floating gate electrode (16) covers and runs through gate dielectric layer (15) corresponding to PMOS access transistor (110), control capacitance (120) and programming electric capacity (130) top, the both sides of floating gate electrode (16) are deposited with lateral protection layer (17), and lateral protection layer (17) covers the sidewall of floating gate electrode (16); PMOS access transistor (110) comprises the first N-type region territory (2) and is positioned at the P type source area (13) of described first N-type region territory (2) internal upper part and P type drain region (21), and control capacitance (120) comprises the second territory, p type island region (5) and is positioned at a P type doped region (6) of described second territory, p type island region (5) internal upper part and the 2nd P type doped region (9); Programming electric capacity (130) comprises the 3rd territory, p type island region (31) and is positioned at the 5th P type doped region (24) of described 3rd territory, p type island region (31) internal upper part and the 6th P type doped region (27); One P type doped region (6), the 2nd P type doped region (9), the 5th P type doped region (24), the 6th P type doped region (27), P type source area (13) and P type drain region (21) are corresponding with the floating gate electrode (16) of top, and contact with corresponding gate dielectric layer (15) and field areas of dielectric (14) respectively;
The material of described gate dielectric layer (15) comprises silicon dioxide; Described lateral protection layer (17) is silicon nitride or silicon dioxide;
The material of described floating gate electrode (16) comprises the conductive polycrystalline silicon of N conduction type.
2. improve a non-volatility memory preparation method for time data memory, it is characterized in that, the preparation method of described non-volatility memory comprises the steps:
(a), semiconductor substrate is provided, described semiconductor substrate comprises the first interarea (32) and the second interarea (33);
(b), on first interarea (32) of semiconductor substrate, carry out required barrier layer deposition, barrier etch and autoregistration ion implantation, to form the first required N-type region territory (2), the 3rd N-type region territory (4), the second territory, p type island region (5) and the 3rd territory, p type island region (31) in semiconductor substrate, first N-type region territory (2) is positioned between the second territory, p type island region (5) and the 3rd territory, p type island region (31), and the 3rd N-type region territory (4) is positioned at the outside in the second territory, p type island region (5) and the 3rd territory, p type island region (31);
(c), in above-mentioned semiconductor substrate, carry out etching groove, to form required isolated groove (10) in semiconductor substrate, and spacer medium is set in isolated groove (10), to form field areas of dielectric (14) in semiconductor substrate, described field areas of dielectric (14) from the first interarea (32) to downward-extension, and make the 3rd N-type region territory (4), the second territory, p type island region (5), the first N-type region territory (2) and the 3rd territory, p type island region (31) top mutually isolated;
(d), at the upper deposit gate dielectric layer (15) of the first interarea (32) corresponding to above-mentioned semiconductor substrate, described gate dielectric layer (15) covers first interarea (32) of semiconductor substrate (1);
(e), at the upper deposit floating gate electrode (16) of first interarea (32) of above-mentioned semiconductor substrate, described floating gate electrode (16) is covered in gate dielectric layer (15) and go up and runs through on the gate dielectric layer (15) of the second territory, p type island region (5), the first N-type region territory (2) and top, the 3rd territory, p type island region (31) correspondence;
(f), deposit the 4th barrier layer (37) on above-mentioned gate dielectric layer (15), and optionally shelter and etch the 4th barrier layer (37), to remove the first N-type region territory (2), corresponding the 4th barrier layer (37) covering floating gate electrode (16) in the second territory, p type island region (5) and top, the 3rd territory, p type island region (31);
(g), at above-mentioned 4th top, barrier layer (37) autoregistration implanting p-type foreign ion, top in the second territory, p type island region (5) obtains a P type lightly doped region (8) and the 2nd P type lightly doped region (11), top in the first N-type region territory (2) obtains the 3rd P type lightly doped region (18) and the 4th P type lightly doped region (22), and the top in the 3rd territory, p type island region (31) obtains the 5th P type lightly doped region (26) and the 6th P type lightly doped region (28);
(h), remove above-mentioned 4th barrier layer (37), and at the upper deposit lateral protection material of the first interarea (32), to form lateral protection layer (17) in the both sides of floating gate electrode (16);
(i), in the upper deposit the 5th barrier layer (38) of above-mentioned first interarea (32), and optionally shelter and etch the 5th barrier layer (38), to remove the 5th barrier layer (38) that the second territory, p type island region (5), the first N-type region territory (2) and the corresponding deposit in top, the 3rd territory, p type island region (31) cover;
(j), at above-mentioned 5th top, barrier layer (38) autoregistration implanting p-type again foreign ion, top in the second territory, p type island region (5) obtains a P type heavily doped region (7) and the 2nd P type heavily doped region (12), top in the first N-type region territory (2) obtains the 3rd P type heavily doped region (19) and the 4th P type heavily doped region (23), and the top in the 3rd P type heavily doped region (31) obtains the 5th P type heavily doped region (25) and the 6th P type heavily doped region (29);
(k), the 5th barrier layer (38) of removing on the first interarea (32);
(l), above the first interarea of semiconductor substrate deposit P+ floating gate electrode material, and optionally shelter and etch P+ floating gate electrode material, all to form P+ floating gate electrode (20) directly over the drift angle (30) of PMOS access transistor (110), programming electric capacity (130) both sides isolated groove (10);
When in described step (a), when semiconductor substrate is P conduction type substrate (1), described step (b) comprises
(b1), on upper deposit first barrier layer (34) of first interarea (32) of P conduction type substrate (1), and optionally shelter and etch described first barrier layer (34), in the first barrier layer (34), N-type impurity ion is injected in top autoregistration, to obtain the second N-type region territory (3) in semiconductor substrate (1);
(b2), first barrier layer (34) of removing on corresponding first interarea (32) of above-mentioned P conduction type substrate (1), and on upper deposit second barrier layer (35) of the first interarea (32);
(b3), optionally shelter and etch the second barrier layer (35), and inject N-type impurity ion in the second barrier layer (35) top autoregistration, to form the first N-type region territory (2) and the 3rd N-type region territory (4) in semiconductor substrate (1), the first N-type region territory (2) and the 3rd N-type region territory (4) are all positioned at the top in the second N-type region territory (3);
(b4), second barrier layer (35) of removing on corresponding first interarea (32) of above-mentioned P conduction type substrate (1), and in the upper deposit the 3rd barrier layer (36) of the first interarea (32);
(b5), optionally shelter and etch the 3rd barrier layer (36), and at the 3rd barrier layer (36) top autoregistration implanting p-type foreign ion, to form the second territory, p type island region (5) and the 3rd territory, p type island region (31) in the second top, N-type region territory (3), isolated by the first N-type region territory (2) between the second territory, p type island region (5) and the 3rd territory, p type island region (31);
When in described step (a), when semiconductor substrate is N conduction type substrate (39), described step (b) comprises
(s1), on upper deposit second barrier layer (35) of the first interarea (32), and optionally shelter and etch the second barrier layer (35);
(s2), in the top autoregistration of above-mentioned second barrier layer (35) inject N-type impurity ion, obtain the first required N-type region territory (2) and the second N-type region territory (4) with the top in N conduction type substrate (39);
(s3), second barrier layer (35) of removing on the first interarea (32), and in the upper deposit the 3rd barrier layer (36) of the first interarea (32);
(s4), optionally shelter and etch the 3rd barrier layer (36), and at the 3rd barrier layer (36) top autoregistration implanting p-type foreign ion, to obtain the second territory, p type island region (5) and the 3rd territory, p type island region (31) in N conduction type substrate (39).
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| CN1414625A (en) * | 2001-10-25 | 2003-04-30 | 旺宏电子股份有限公司 | Manufacturing method and structure of flash memory with split floating gate |
| CN1909211A (en) * | 2005-08-04 | 2007-02-07 | 三星电子株式会社 | Nonvolatile memory devices and methods of fabricating the same |
| CN102544122A (en) * | 2012-02-21 | 2012-07-04 | 无锡来燕微电子有限公司 | Non-volatile memory with P+ single polycrystalline architecture and preparation method for non-volatile memory |
| CN102544074A (en) * | 2012-02-21 | 2012-07-04 | 无锡来燕微电子有限公司 | Non-volatile memory compatible with complementary metal oxide semiconductor (CMOS) logical process and preparation method for non-volatile memory |
| CN202712187U (en) * | 2012-07-11 | 2013-01-30 | 无锡来燕微电子有限公司 | Non-volatile memory for improving data storage time |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414625A (en) * | 2001-10-25 | 2003-04-30 | 旺宏电子股份有限公司 | Manufacturing method and structure of flash memory with split floating gate |
| CN1909211A (en) * | 2005-08-04 | 2007-02-07 | 三星电子株式会社 | Nonvolatile memory devices and methods of fabricating the same |
| CN102544122A (en) * | 2012-02-21 | 2012-07-04 | 无锡来燕微电子有限公司 | Non-volatile memory with P+ single polycrystalline architecture and preparation method for non-volatile memory |
| CN102544074A (en) * | 2012-02-21 | 2012-07-04 | 无锡来燕微电子有限公司 | Non-volatile memory compatible with complementary metal oxide semiconductor (CMOS) logical process and preparation method for non-volatile memory |
| CN202712187U (en) * | 2012-07-11 | 2013-01-30 | 无锡来燕微电子有限公司 | Non-volatile memory for improving data storage time |
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