WO2014134925A1 - 多晶硅薄膜晶体管及其制备方法、阵列基板 - Google Patents
多晶硅薄膜晶体管及其制备方法、阵列基板 Download PDFInfo
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- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02532—Silicon, silicon germanium, germanium
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26506—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors
- H01L21/26513—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors of electrically active species
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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- H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
- H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
- H10D30/0312—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes
- H10D30/0314—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes of lateral top-gate TFTs comprising only a single gate
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- H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
- H10D30/0321—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] comprising silicon, e.g. amorphous silicon or polysilicon
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- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6704—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device
- H10D30/6713—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes
- H10D30/6715—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes characterised by the doping profiles, e.g. having lightly-doped source or drain extensions
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/674—Thin-film transistors [TFT] characterised by the active materials
- H10D30/6741—Group IV materials, e.g. germanium or silicon carbide
- H10D30/6743—Silicon
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- H10D86/01—Manufacture or treatment
- H10D86/021—Manufacture or treatment of multiple TFTs
- H10D86/0221—Manufacture or treatment of multiple TFTs comprising manufacture, treatment or patterning of TFT semiconductor bodies
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- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/421—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs having a particular composition, shape or crystalline structure of the active layer
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6704—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device
- H10D30/6713—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes
- H10D30/6715—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes characterised by the doping profiles, e.g. having lightly-doped source or drain extensions
- H10D30/6721—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device characterised by the properties of the source or drain regions, e.g. compositions or sectional shapes characterised by the doping profiles, e.g. having lightly-doped source or drain extensions having lightly-doped extensions consisting of multiple lightly doped zones or having non-homogeneous dopant distributions, e.g. graded LDD
Definitions
- Embodiments of the present invention relate to a polysilicon thin film transistor, a method of fabricating the same, and an array substrate. Background technique
- the liquid crystal display using the low temperature polysilicon film field effect transistor has the advantages of high resolution, fast response speed, high brightness, and high aperture ratio. Due to the characteristics of LTPS, LTPS-TFT has high electron mobility.
- the peripheral driver circuit can be fabricated on the glass substrate of the LCD simultaneously with the pixel array to achieve system integration, save space, and reduce the cost of the driver IC, which can also reduce product defect rate.
- LTPS-TFT With the trend toward miniaturization, LTPS-TFT is gradually getting smaller and smaller. However, since the supply voltage and operating voltage of the LTPS-TFT are not correspondingly greatly reduced, the working electric field strength is increased, which leads to an increase in the rate of electron motion. In this case, when the energy of the electrons is sufficiently high, the electrons leave the substrate and tunnel into the gate oxide, which is called the hot carrier effect.
- This effect increases the threshold voltage of the N-type metal oxide semiconductor (NMOS) or reduces the threshold voltage of the P-type metal oxide semiconductor (PMOS), thereby affecting the characteristic parameters of the MOS, such as the threshold voltage V T , transconductance.
- g m subthreshold slope S t , saturation current I dsat , etc., cause degradation of MOS characteristics and cause long-term reliability problems.
- a preparation method includes, for example, the following steps.
- Step S101 as shown in FIG. 1, forming a polysilicon layer on the substrate 10, and forming an active layer by one patterning process, the active layer including a channel region 200 and a first pattern on both sides of the channel region And a third pattern located on a side of the first pattern 201 opposite to the channel region 200 5102.
- a gate insulating layer 30 is formed on the substrate 10, and a first photoresist pattern 401 corresponding to the channel region 200 and the first pattern 201 is formed.
- a first ion implantation is performed, a heavily doped region 2031 is formed at the third pattern 203, and then the first photoresist pattern 401 is removed.
- a protective layer 60, a source electrode 701 and a drain electrode 702, and a pixel electrode 801 electrically connected to the drain electrode 702 are formed.
- Embodiments of the present invention provide a polysilicon thin film transistor and a method of fabricating the same, and an array substrate, thereby repairing interface defects and defect states in polysilicon, and improving hot carrier effects, thereby making the characteristics of the TFT more stable.
- One aspect of the present invention provides a polysilicon thin film transistor including a gate electrode, a source electrode, a drain electrode, and an active layer, the active layer including at least a channel region, a first doping region, a second doping region, and a heavily doped region, the first doped region is disposed on two sides of the channel region, and the second doped region is disposed on a side of the first doped region opposite to the channel region; The heavily doped region is disposed on a side of the second doped region opposite to the first doped region; a dose of ions in the heavily doped region is between the first doped region and the Between the second doped regions.
- a further aspect of the present invention provides an array substrate comprising the above polysilicon thin film transistor.
- a further aspect of the present invention provides a method of fabricating a polysilicon thin film transistor, comprising: forming a gate electrode, a source electrode, a drain electrode, and an active layer on a substrate, the active layer including at least a channel region, located at the a first pattern on both sides of the channel region, a second pattern on a side of the first pattern facing away from the channel region, and a third pattern on a side of the second pattern facing away from the first pattern Forming a heavily doped region at the third pattern by a doping process, forming a passivation doped region or a lightly doped region at the second pattern, forming the light doping at the first pattern a dummy region or the passivation doped region; the first pattern and the second pattern are respectively one of the passivation doped region and the lightly doped region;
- the passivation doping region includes a passivation dopant ion that forms
- the passivation doped region includes a passivation dopant ion that forms a stable covalent bond with the silicon atom
- the passivation doping The passivation dopant ions in the region can repair the interface defects and the defect states in the polysilicon; on the other hand, after the high concentration of the passivation dopant ions diffuse, the diffusion rate of ions in the other two regions can be suppressed, thereby effectively improving the heat.
- the carrier effect which in turn makes the characteristics of the TFT more stable.
- FIG. 1 is a schematic diagram showing a first to fifth schematic diagrams of a conventionally provided array substrate
- FIG. 6 is a schematic structural view of a polysilicon thin film transistor according to an embodiment of the present invention
- FIG. 8 is a schematic structural diagram of a polysilicon thin film transistor according to an embodiment of the present invention
- FIG. 9 is a schematic structural diagram of an array substrate according to an embodiment of the present invention
- FIG. 10 is a schematic structural diagram of another array substrate according to an embodiment of the present disclosure.
- FIG. 11 is a schematic structural diagram of still another array substrate according to an embodiment of the present disclosure.
- FIG. 12 is a schematic structural diagram of still another array substrate according to an embodiment of the present invention.
- FIGS. 13 to 19 are schematic diagrams showing processes for preparing a polysilicon thin film transistor according to an embodiment of the present invention.
- Embodiments of the present invention provide a polysilicon thin film transistor, as shown in FIG. 6, including a gate electrode
- the active layer 21 includes at least a channel region 200, a first doping region 201a, a second doping region 202a, and a heavily doped region 2031.
- Channel region 200 provides a channel for carriers when the polysilicon thin film transistor is in operation.
- the first doped region 201a is disposed on two sides of the channel region 200, and the second doped region 202a is also disposed on both sides of the channel region 200, and in the first doped region 201a is opposite to one side of the channel region 200, and thus the first doping region 201a is sandwiched between the channel region 200 and the second doping region 202a.
- the heavily doped region 2031 is also disposed on both sides of the channel region 200, and on a side of the second doping region 202a facing away from the first doping region 201a, and thus the second doping region 202a is The heavily doped region 2031 is between the first doped region 201a.
- a dose of implanted ions in the heavily doped region 2031 is between a dose of ions implanted in the first doped region 201a and the second doped region 202a.
- the polysilicon TFT shown in Fig. 6 includes a lightly doped region in order to improve leakage current.
- one of the first doping region 201a and the second doping region 202a as described above may be a lightly doped region.
- the heavily doped region 2031 may be a P-type heavily doped region, or an N-type heavily doped region.
- the ions implanted in the heavily doped region 2031 may be, for example, boron ions, and when it is N-type, The ions implanted in the heavily doped region 2031 may be, for example, phosphorus ions.
- Embodiments of the present invention provide a polysilicon thin film transistor including a gate electrode 50, a source electrode 701, a drain electrode 702, and an active layer 21.
- the active layer 21 includes at least a channel region 200, a first doping region 201a, a second doping region 202a, and a heavily doped region 2031.
- the first doping region 201a is disposed on two sides of the channel region 200
- the second doping region 202a is disposed on both sides of the channel region 200 and facing away from the first doping region 201a.
- One side of the channel region 200; the heavily doped region 2031 is disposed on both sides of the channel region 200, and on a side of the second doping region 202a facing away from the first doping region 201a.
- the dose of implanted ions in the heavily doped region 2031 is between the doses of implanted ions in the first doped region 201a and the second doped region 202a.
- One of the first doped region 201a or the second doped region 202a is a passivation doped region, and the passivated doped region includes a passivation dopant ion that forms a stable covalent bond with the silicon atom.
- the passivation dopant ions in the passivation doping region can repair the interface defects and the defect states in the polysilicon; on the other hand, after the high concentration of the passivation dopant ions diffuse, the other two regions can be suppressed.
- the diffusion rate of the ions is effective to improve the hot carrier effect, thereby making the characteristics of the TFT more stable.
- the first doping region 201a is a passivation doping region 2021
- the second doping region 202a is a lightly doped region 2011
- the ions in the passivation doping region 2021 The implantation depth is smaller than the implantation depth of ions in the heavily doped region 2031 and the lightly doped region 2011, and the dose of implanted ions is greater than the dose of implanted ions in the heavily doped region 2031.
- the passivation doped region 2021 includes a passivation dopant ion that forms a stable covalent bond with a silicon atom, such as a nitrogen ion (N + ) or a nitrogen ion ( ⁇ 2 + ), which can form Si with Si. N bond, thereby repairing interface defects and defect states in polysilicon.
- a passivation dopant ion that forms a stable covalent bond with a silicon atom, such as a nitrogen ion (N + ) or a nitrogen ion ( ⁇ 2 + ), which can form Si with Si. N bond, thereby repairing interface defects and defect states in polysilicon.
- injection depth refers to the distance into the interior of the doped layer with reference to the upper surface of the doped pattern (doped layer); “It is defined with respect to the underlying substrate, that is, the surface on the opposite side of the substrate from the substrate is the upper surface, and the other opposite surface from the substrate is the lower surface.
- the doping ion concentration of the lightly doped region 2011 is smaller than the doping ion concentration of the heavily doped region 2031.
- the first doped region 201a is a lightly doped region 2011, and the second doped region 202a is a passivated doped region 2021; the passivation doped region
- the implantation depth of ions in 2021 is smaller than the implantation depth of ions in the heavily doped region 2031 and the lightly doped region 2011, and The dose of implanted ions is greater than the dose of implanted ions in the heavily doped region 2031.
- the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of the ions in the heavily doped region 2031 and the lightly doped region 2011, and the ions in the two regions can be suppressed ( For example, boron ions or phosphorus ions diffuse and escape toward the gate insulating layer, making the characteristics of the TFT more stable.
- Embodiments of the present invention provide a polysilicon thin film transistor including a gate electrode 50, a source electrode 701, a drain electrode 702, and an active layer, the active layer including at least a channel region 200, a first doping region 201a, and a second a doped region 202a and a heavily doped region 2031, the first doped region 201a is disposed on two sides of the channel region 200, and the second doped region 202a is disposed on both sides of the channel region 200 And at a side of the first doped region 201a facing away from the channel region 200; the heavily doped region 2031 is disposed on both sides of the channel region 200 and in the second doped region 202a a side opposite to the first doping region 201a; a dose of implanted ions in the heavily doped region 2031 is implanted between the first doped region 201a and the second doped region 202a dose.
- the passivation doping region 2021 includes passivation forming a stable covalent bond with the silicon atom.
- the passivation dopant ions in the passivation doped region 2021 can repair the interface defects and the defect states in the polysilicon; on the other hand, after the high concentration of the passivation dopant ions diffuse, the other can be suppressed
- the diffusion rate of ions in the two regions is effective to improve the hot carrier effect, thereby making the characteristics of the TFT more stable.
- the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of the ions in the heavily doped region 2031 and the lightly doped region 2011, ions in the two regions ( For example, boron ions or phosphorus ions are diffused and escaped toward the gate insulating layer, and the characteristics of the TFT become more stable.
- An embodiment of the present invention provides an array substrate, which includes the above-described polysilicon film transistor and pixel electrode 801 as shown in FIGS. 9 to 12.
- the array substrate of the embodiment of the present invention includes, for example, a plurality of gate lines and a plurality of data lines, the gate lines and the data lines crossing each other thereby defining pixel units arranged in a matrix, each of the pixel units including a thin film transistor as a switching element and A pixel electrode for controlling the arrangement of liquid crystals.
- the gate of the thin film transistor of each pixel is electrically connected or integrally formed with the corresponding gate line
- the source is electrically connected or integrally formed with the corresponding data line
- the drain is electrically connected or integrally formed with the corresponding pixel electrode.
- Each pixel unit may further include a common electrode for forming a liquid crystal with the pixel electrode according to the type of the array substrate To drive the deflection of the liquid crystal; the common electrode may be formed on a different layer or on the same layer as the pixel electrode.
- the buffer layer 90 may be formed on the substrate 10 first.
- the buffer layer 90 may be a material such as silicon nitride or silicon oxynitride.
- the array substrate provided by the embodiment of the invention can be used for a liquid crystal display device of the ADS, IPS, TN or the like. Therefore, as shown in FIG. 11 or FIG. 12, the array substrate may further include a common electrode 802 when used in an ADS or IPS type LCD; and for a TN type LCD, a common electrode is formed on an opposite substrate disposed opposite to the array substrate. (for example, a color film substrate).
- Embodiments of the present invention provide an array substrate including the above polysilicon thin film transistor.
- the passivation doped region includes a passivation dopant ion that forms a stable covalent bond with the silicon atom
- passivation The passivation dopant ions in the doped region can repair the interface defects and the defect states in the polysilicon; on the other hand, after the high concentration of the passivation dopant ions diffuse, the diffusion rate of ions in the other two regions can be suppressed, thereby The carrier effect is effectively improved, and the characteristics of the TFT become more stable.
- Embodiments of the present invention provide a method for fabricating a polysilicon thin film transistor, including forming a gate electrode 50, a source electrode 701, a drain electrode 702, and an active layer on a substrate, the active layer including at least a channel region 200, located at a first pattern 201 on both sides of the channel region, a second pattern 202 on a side of the first pattern facing away from the channel region, and a side on the side of the second pattern facing away from the first pattern The third pattern 203.
- Forming a heavily doped region 2031 at the third pattern 203 by a doping process forming a passivation doped region 2021 or a lightly doped region 2011 at the second pattern 202, correspondingly in the first pattern
- a lightly doped region 2011 or a passivated doped region 2021 is formed at 201.
- the first pattern 201 and the second pattern 202 are one of a passivation doping region 2021 and a lightly doped region 2011, respectively.
- the passivation doping region 2021 includes a passivation dopant ion that forms a stable covalent bond with the silicon atom, and the passivation dopant ion in the passivation doping region 2021 has a implantation depth less than the re-doping The implantation depth of ions in the impurity region and the lightly doped region is greater than the dose of implanted ions in the heavily doped region.
- the first pattern 201 and the second pattern 202 are one of the passivation doping region 2021 and the lightly doped region 2011, respectively, when the first pattern 201 is passivated and doped.
- the second pattern 202 is a lightly doped region 2011; when the first pattern 201 is a lightly doped region In 2011, the second pattern is a passivation doped region 2021.
- the second heavily doped region 2031 can be a P-type heavily doped region, or an N-type heavily doped region.
- the implanted ions may be, for example, boron ions
- the implanted ions may be, for example, phosphorus ions.
- passivation dopant ions capable of forming stable covalent bonds with silicon atoms are, for example, nitrogen ions (N + ) or nitrogen ions ( ⁇ 2 + ), which can form Si-N bonds with Si.
- injection depth is the distance from the upper surface of the doped pattern (the doped layer) to the inside of the doped layer, and the so-called “upper surface” is the substrate below.
- the surface opposite to the substrate of the pattern is defined as the upper surface, and the other opposite surface closer to the substrate is the lower surface.
- the light doping zone 2011 has a lower ion concentration than the heavily doped region 2031.
- Embodiments of the present invention provide a method of fabricating an array substrate, the method comprising forming a gate electrode 50, a source electrode 701, a drain electrode 702, and an active layer on a substrate, the active layer including at least a channel region 200, a first pattern 201 on both sides of the channel region, a second pattern 202 on a side of the first pattern facing away from the channel region, and a side of the second pattern facing away from the first pattern a third pattern 203, a heavily doped region 2031 is formed at the third pattern 203 by a doping process, and a passivation doped region 2021 or a lightly doped region 2011 is formed at the second pattern 202.
- a lightly doped region 2011 or a passivated doped region 2021 is formed at the first pattern 201; a depth of implantation of the passivated dopant ions in the passivation doped region 2021 is smaller than the heavily doped region 2031 and the The implantation depth of ions in the lightly doped region 2011 is greater than the dose of ions in the heavily doped region 2031.
- the passivation dopant ions in the passivation doped region 2021 include a passivation dopant capable of forming a stable covalent bond with the silicon atom, the interface defects and the defect state in the polysilicon can be repaired; on the other hand, the high concentration of the passivation doping After the ions are diffused, the diffusion rate of ions in the heavily doped region 2031 and the lightly doped region 2011 can be suppressed, thereby effectively improving the hot carrier effect, thereby making the characteristics of the TFT more stable.
- the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of the ions in the heavily doped region 2031 and the lightly doped region 2011, this can be suppressed in the two regions.
- the ions for example, boron ions or phosphorus ions
- Forming an active layer on the substrate including a channel region 200, a first pattern 201 on both sides of the channel region, and a first pixel on a side opposite to the channel region a second pattern 202, a third pattern 203 located on a side of the second pattern opposite the first pattern
- the step of An example includes: forming a polysilicon layer on a substrate, and performing a patterning process to form a channel region 200, a first pattern 201 on either side of the channel region, and the first pattern facing away from the channel a second pattern 202 on one side of the region, and a third pattern 203 on a side of the second pattern opposite the first pattern.
- forming a polysilicon layer on the substrate may be: depositing an amorphous silicon layer on the substrate by plasma enhanced chemical vapor deposition (PECVD), and then performing a dehydrogenation process on the amorphous silicon layer by using a high temperature oven. Prevents hydrogen explosion during crystallization and reduces the density of defects in the film after crystallization.
- PECVD plasma enhanced chemical vapor deposition
- the low-temperature polysilicon formation process can be performed, and the amorphous silicon layer can be crystallized by a laser annealing process (ELA), a metal induced crystallization process (MIC), a solid phase crystallization process (SPC), or the like. , forming a polysilicon layer on the substrate.
- the doping process includes an ion implantation process and a diffusion process.
- Ion implantation has the advantages of incorporating various impurities into different semiconductors at a lower temperature, precisely controlling the concentration distribution and implantation depth of the doped ions, and achieving uniform doping over a large area. Therefore, in this embodiment, the doping process is preferably an ion implantation process.
- examples of the method may include the following steps:
- Step 1 An active layer on a substrate, the active layer including a channel region 200, a first pattern 201 on both sides of the channel region, and a side of the first pattern facing away from the channel region a second pattern 202, a third pattern 203 located on a side of the second pattern opposite the first pattern.
- Step 2 forming a gate insulating layer 30 on the basis of the foregoing steps, and forming a first photoresist completely corresponding to the channel region 200 and the first pattern 201 and the second pattern 202 on the gate insulating layer Pattern 401.
- the first photoresist pattern 401 completely corresponds to the channel region 200 and the first pattern 201 and the second pattern 202, which means that the first photoresist pattern 401 covers the channel completely.
- the thickness of the gate insulating layer 30 is usually between 800 and 1000.
- Step 3 Form a heavily doped region 2031 at the third pattern 203 by one ion implantation.
- the first ion implantation is performed using the first photoresist pattern 401 as a mask.
- the heavily doped region 2031 is P-type or N-type; when it is P-type, the implanted ions may be, for example, boron ions, and when it is N-type, the implanted ions may be, for example, phosphorus ions.
- the first ion injection is between 10 and 50 KeV, and the dose of implanted ions is between lE14 and 5E15/cm 3 .
- Step 4 after removing the photoresist at the first photoresist pattern 401, sequentially forming a metal layer and a photoresist on the substrate, exposing and developing the photoresist, and etching the metal layer. Forming the gate electrode 50 and the second photoresist pattern 402 over the gate electrode 50, and the second photoresist pattern 402 completely corresponds to the channel region 200 and the first pattern 201 .
- the second photoresist pattern 402 completely corresponds to the channel region 200 and the first pattern 201, and the same means that the second photoresist pattern 402 completely covers the channel region 200. And the first pattern 201.
- the etching method used herein is wet etching, that is, after etching, the gap between the edge of the gate electrode 50 and the edge of the second photoresist pattern 402 corresponds to the first pattern 201. .
- Step 5 forming a passivation doped region 2021 or a lightly doped region 2011 at the second pattern 202 by one ion implantation; the passivation doped region 2021 includes a blunt bond forming a stable covalent bond with a silicon atom.
- Doping ions, and the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of ions in the heavily doped region 2031, and the dose of implanted ions is greater than the heavily doped region The dose of implanted ions in 2031.
- the second ion implantation is performed by using the second photoresist pattern 402 as a mask. If the passivation doping region 2021 is formed at the second pattern 202 after the second ion implantation, the second ion is formed.
- the implantable selectable acceleration voltage is between 10 and 50 KeV, and the implant dose is between 1 E 14 and 5E 15 /cm 3 ; if the second ion is implanted, the lightly doped region 2011 is formed at the second pattern 202,
- the second ion implantation can select an accelerating voltage between 10 and 50 KeV, and the implantation dose is between lE14 and 5E15/cm 3 .
- the passivation dopant ion capable of forming a stable covalent bond with a silicon atom is, for example, a nitrogen ion (N+) or a nitrogen ion (N 2 + ).
- nitrogen ions or nitrogen ions can form Si-N bonds with Si to repair interface defects and defect states in polysilicon;
- high concentration of passivation dopant ions can inhibit heavily doped regions and The diffusion rate of ions in the lightly doped region is effective to improve the hot carrier effect, thereby making the characteristics of the TFT more stable.
- the implantation depth of the passivation dopant ions in the passivation doping region is smaller than the implantation depth of ions in the heavily doped region and the lightly doped region, ions in the two regions (eg, boron ions or phosphorus may be suppressed) The ions diffuse and escape toward the gate insulating layer.
- Step 6 after removing the photoresist at the second photoresist pattern 402, forming a lightly doped region 2011 or a passivation doped region 2021 at the first pattern 201 by one ion implantation;
- a pattern 201 and the second pattern 202 are respectively one of a passivation doping region 2021 and a lightly doped region 2011, and an implantation depth of ions in the lightly doped region 2011 is greater than that in the passivation doping region 2021 The passivation depth of the passivated ions.
- the third ion implantation is performed by using the gate electrode 50 as a mask. If the passivation doping region 2021 is formed at the second pattern 202 after the second ion implantation in the step 5, the step is performed at this step. In FIG. 6, after the third ion implantation, the lightly doped region 2011 is formed at the first pattern 201. If the lightly doped region 2011 is formed at the second pattern 202 after the second ion implantation, in this step 6, after the third ion implantation, the passivation doping region 2021 is formed at the first pattern 201.
- the implantation depth of the ions is related to the energy (kinetic energy) of the ions, and the energy is proportional to the acceleration voltage, for example, in the first ion implantation, if the implanted ions are boron ions, the energy of the boron ions About 40KeV, the dose is about lE15/cm 3 , if the implanted ions are phosphorus ions, the energy of the phosphorus ions is about 60 KeV, and the dose is about lE15/cm 3 .
- the implanted passivation dopant is, for example, a nitrogen ion or a nitrogen ion (N + or ⁇ 2 + )
- the energy of the nitrogen ion or the nitrogen ion is about 50 KeV
- the implantation dose is about 2E15/cm 3 .
- Step 7 After completing the foregoing steps and performing annealing treatment, a protective layer 60, and a source electrode 701 and a drain electrode 702 are formed on the substrate.
- the semiconductor parameters such as mobility and lifetime are affected, and most of the ions are not located at the replacement position when being implanted.
- the semiconductor is typically annealed at the appropriate time and temperature.
- the annealing method can be either high temperature furnace tube or rapid thermal annealing (RTA). If the high temperature furnace tube method is adopted, the temperature range is between 400 and 550 ° C, and the baking time is 1 to 4 hours. When the implanted ions are boron ions, the temperature can be selected for baking at 450 ° C for 4 hours. When the ions are riding ions, it is possible to bake at 550 ° C for 4 hours. If RTA is used, the temperature range is between 550 and 600 °C, and the treatment time is 20 to 200 seconds. Regardless of whether the implanted ions are boron ions or phosphorus ions, it can be treated at 600 °C for 60 seconds.
- RTA rapid thermal annealing
- the formation of the passivation doped region 2021 or the lightly doped region 2011 at the second pattern 202 is: Forming a passivation doping region 2021 at the second pattern 202; correspondingly, forming the lightly doped region 2011 or the passivation doping region 2021 at the first pattern 201 is: in the first pattern Forming light at 201 Doped area 2011.
- Embodiments of the present invention provide a method for fabricating a polysilicon thin film transistor, including the following steps:
- the photoresist 40 is formed on the polysilicon layer, for example, by coating, deposition, or the like.
- a layer of amorphous silicon may be deposited on the substrate by PECVD, and the amorphous silicon layer may be subjected to a dehydrogenation process using a high temperature oven.
- the LTPS preparation process is performed, and the amorphous silicon layer is crystallized by a crystallization method such as a laser annealing process, a metal induced crystallization process, or a solid phase crystallization process, and a polysilicon layer 20 is formed on the substrate.
- a layer of photoresist 40 is then applied over the polysilicon layer.
- the active layer 21 includes: a channel region 200, a first pattern 201 on both sides of the channel region, a second pattern 202 on a side of the first pattern facing away from the channel region, and a location The second pattern is opposite to the third pattern 203 on one side of the first pattern.
- a gate insulating layer 30 is formed on the basis of the foregoing steps, and a complete correspondence with the channel region 200 and the first pattern 201 and the second pattern 202 is formed on the gate insulating layer 30.
- the thickness of the gate insulating layer 30 affects the amount of energy required for subsequent ion implantation. Therefore, in this step, the thickness of the gate insulating layer 30 may be between 800 and 1000.
- the heavily doped region 2031 may be P-type or N-type; when it is P-type, the implanted ions may be, for example, boron ions, and when it is N-type, the implanted ions may be, for example, phosphorus ions.
- the energy of the boron ions can be, for example, 40 KeV, and the dose can be selected as 1E15/cm 3 ;
- the ion is a phosphorus ion, and the energy of the phosphorus ion can be, for example, 60 KeV, and the dose is about 1E15/cm 3 .
- a metal layer and a photoresist are sequentially formed on the substrate, the photoresist is exposed, developed, and then the metal layer is etched. Shape a gate electrode 50 as shown in FIG. 17, and a second photoresist pattern 402 over the gate electrode, and the second photoresist pattern 402 and the channel region 200 and the first pattern 201 corresponds exactly.
- the etching here is a wet etching. After etching, the gap between the edge of the gate electrode 50 and the edge of the second photoresist pattern 402 corresponds exactly to the first pattern 201.
- the passivation doping region 2021 includes passivation forming a stable covalent bond with a silicon atom.
- Doping ions, and the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of ions in the heavily doped region 2031, and the dose is greater than the ions in the heavily doped region 2031 dose.
- the passivation dopant ion capable of forming a stable covalent bond with a silicon atom is, for example, a nitrogen ion (N + ) or a nitrogen ion (N 2 + ).
- the energy thereof can be, for example, 50 KeV, and the implantation dose can be selected to be 2E 15/cm 3 .
- nitrogen ions or nitrogen ions can form Si-N bonds with Si, thereby repairing interface defects and defect states in polysilicon; on the other hand, after diffusion of high concentration passivation ions, Suppressing the diffusion rate of ions in the heavily doped region 2031; on the other hand, since the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of ions in the heavily doped region 2031, it can be suppressed Ions (for example, boron ions or phosphorus ions) in the heavily doped region 2031 diffuse and escape toward the gate insulating layer.
- Ions for example, boron ions or phosphorus ions
- the implantation depth is a distance referenced by one side of the polysilicon layer 20 away from the substrate 10, that is, a distance referenced by the contact surface of the polysilicon layer 20 and the gate insulating layer 30. If it is close to the reference surface, the depth is shallow; if it is far from the reference source, the depth is deep.
- the implantation dose of ions in 2011 is smaller than the implantation dose of ions in the heavily doped region 2031, which is not limited herein.
- a lightly doped region 2011 is formed which can suppress leakage current.
- the passivation doping region 2021 due to the action of the passivation doping region 2021, it can suppress the diffusion rate of ions in the lightly doped region 2011; the implantation depth of the passivation dopant ions in the passivation doping region 2021 is less than the light doping District 2011 It is known that the implantation depth of the sub-particles can also improve the diffusion and escape of ions (for example, boron ions or phosphorus ions) in the light-doped region 2011 toward the gate insulating layer 30, thereby making the characteristics of the TFT more stable.
- ions for example, boron ions or phosphorus ions
- the damage of the crystal lattice during ion implantation can be repaired, and the parameters such as mobility can be restored, and the implanted ions can be placed at the replacement position in the crystal lattice.
- the annealing method can be RTA, the temperature range is 550 ⁇ 600 °C, and the processing time is 20 ⁇ 200 seconds; here, whether it is boron ion or phosphorus ion, it can be treated at 600 ° C for 60 seconds.
- Embodiments of the present invention provide a method of fabricating a polysilicon thin film transistor, the method comprising: forming a channel region 200 on a substrate, a first pattern 201 on both sides of the channel region, and the first pattern facing away from the first pattern a second pattern 202 on one side of the channel region, a third pattern 203 on a side of the second pattern facing away from the first pattern, and forming a weight at the third pattern 203 by a doping process a doped region 2031, a passivation doped region 2021 or a lightly doped region 2011 is formed at the second pattern 202, and a lightly doped region 2011 or a passivated doped region 2021 is formed at the first pattern 201, respectively.
- the implantation depth of the passivation dopant ions in the passivation doping region 2021 is smaller than the implantation depth of ions in the heavily doped region 2031 and the lightly doped region 2011, and the dose of implanted ions is greater than the weight The dose of ions implanted in the doped region 2031.
- the passivation dopant ions in the passivation doped region 2021 include a passivation dopant capable of forming a stable covalent bond with the silicon atom, the interface defects and the defect state in the polysilicon can be repaired; on the other hand, the high concentration of the passivation doping After the ions are diffused, the diffusion rate of the ions in the heavily doped region 2031 and the lightly doped region 2011 can be suppressed, thereby effectively improving the hot carrier effect, thereby making the characteristics of the TFT more stable; and, in addition, the passivation doping region
- the implantation depth of the passivation dopant ions is smaller than the implantation depth of ions in the heavily doped region and the lightly doped region, and the ions (for example, boron ions or phosphorus ions) in the two regions can be inhibited from being applied to the gate insulating layer.
- the ions for example, boron ions or phosphorus ions
- the method further includes: forming on the substrate as shown in FIG. 9 and The pixel electrode 801 to which the drain electrode is electrically connected.
- a gate line electrically connected to the gate electrode, a gate line lead, a data line electrically connected to the source electrode, a data line lead, and the like are simultaneously formed, and details are not described herein.
- the channel region 200 is formed on the substrate, the first pattern 201 on both sides of the channel region, and the second pattern on the side of the first pattern facing away from the channel region 202, and before the third pattern 203 of the second pattern facing away from the side of the first pattern, the method for fabricating the array substrate further comprises: forming a buffer layer 90 as shown in FIG. 10 on the substrate. This prevents the influence of harmful substances (such as alkali metal ions) on the performance of the polysilicon layer in the glass substrate.
- harmful substances such as alkali metal ions
- the array substrate prepared by the method provided by the embodiments of the present invention can be applied to an Advanced Super Dimension Switch (ADS), In-Plane Switching (IPS), and Organic Electron Laser Display (Organic). Production of liquid crystal display devices such as Electroluminesence Display, OELD).
- ADS Advanced Super Dimension Switch
- IPS In-Plane Switching
- Organic Electron Laser Display Organic Electron Laser Display
- the working principle of the ADS type LCD is: forming a multi-dimensional electric field by the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer, so that the slit electrode between the liquid crystal cell and the electrode are directly above All oriented liquid crystal molecules are capable of rotating, thereby improving liquid crystal working efficiency and increasing light transmission efficiency.
- ADS technology can improve the picture quality of thin film field effect transistor liquid crystal display (TFT-LCD) products with high resolution, high transmittance, low power consumption, wide viewing angle, high aperture ratio, low chromatic aberration, and no squeeze water ripple ( Push Mura) and other advantages.
- OELD has self-illuminating properties, and it has a large viewing angle and significant power saving.
- the method of fabricating the array substrate further includes: forming a common electrode 802 as shown in FIG. 11 or FIG.
- a common electrode may also be formed under the pixel electrode 801.
- the method of fabricating the array substrate further includes: forming a common electrode while forming the pixel electrode 801 electrically connected to the drain electrode 702.
- an organic light emitting diode is continuously formed on the formed pixel electrode 801, the pixel electrode 801 can serve as a cathode or an anode of the organic light emitting diode, and the organic light emitting diode includes an organic light emitting layer.
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CN103151388A (zh) | 2013-06-12 |
US9530799B2 (en) | 2016-12-27 |
US10211229B2 (en) | 2019-02-19 |
CN103151388B (zh) | 2015-11-11 |
US20150206905A1 (en) | 2015-07-23 |
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