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CN101488526A - N type SOI lateral double-diffused metal-oxide semiconductor transistor - Google Patents

N type SOI lateral double-diffused metal-oxide semiconductor transistor Download PDF

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Publication number
CN101488526A
CN101488526A CNA2009100249634A CN200910024963A CN101488526A CN 101488526 A CN101488526 A CN 101488526A CN A2009100249634 A CNA2009100249634 A CN A2009100249634A CN 200910024963 A CN200910024963 A CN 200910024963A CN 101488526 A CN101488526 A CN 101488526A
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oxide layer
type
region
floating
oxide
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钱钦松
高怀
吴虹
李海松
孙伟锋
陆生礼
时龙兴
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Southeast University
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Southeast University
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00Field-effect transistors [FET]
    • H10D30/60Insulated-gate field-effect transistors [IGFET]
    • H10D30/64Double-diffused metal-oxide semiconductor [DMOS] FETs
    • H10D30/65Lateral DMOS [LDMOS] FETs
    • H10D30/657Lateral DMOS [LDMOS] FETs having substrates comprising insulating layers, e.g. SOI-LDMOS transistors
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
    • H10D62/113Isolations within a component, i.e. internal isolations
    • H10D62/115Dielectric isolations, e.g. air gaps
    • H10D62/116Dielectric isolations, e.g. air gaps adjoining the input or output regions of field-effect devices, e.g. adjoining source or drain regions
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D64/00Electrodes of devices having potential barriers
    • H10D64/20Electrodes characterised by their shapes, relative sizes or dispositions 
    • H10D64/27Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
    • H10D64/311Gate electrodes for field-effect devices
    • H10D64/411Gate electrodes for field-effect devices for FETs
    • H10D64/511Gate electrodes for field-effect devices for FETs for IGFETs
    • H10D64/514Gate electrodes for field-effect devices for FETs for IGFETs characterised by the insulating layers
    • H10D64/516Gate electrodes for field-effect devices for FETs for IGFETs characterised by the insulating layers the thicknesses being non-uniform

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Abstract

一种N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,包括:半导体衬底,在半导体衬底上面设置有埋置氧化层,埋置氧化层上面是N型的掺杂半导体漂移区,P阱区设置在N型的掺杂半导体漂移区上方,而场氧化层,金属层,栅氧化层,多晶硅栅以及氧化层设置在所述器件的上表面,N型源区和P型接触区设置在P阱中,其特征是:该器件还包括至少一层浮置氧化层结构,它位于漏区与埋置氧化层结构之间的N型掺杂半导体漂移区内,而且,允许有多层浮置氧化层结构,以进一步优化漏区纵向电场的分布,从而提高器件整体的击穿电压。

Figure 200910024963

An N-type silicon-on-insulator lateral double-diffused metal oxide semiconductor transistor, comprising: a semiconductor substrate, a buried oxide layer is arranged on the semiconductor substrate, and an N-type doped semiconductor drift region is placed on the buried oxide layer, The P well region is arranged above the N-type doped semiconductor drift region, and the field oxide layer, metal layer, gate oxide layer, polysilicon gate and oxide layer are arranged on the upper surface of the device, the N-type source region and the P-type contact region Set in the P well, the feature is: the device also includes at least one layer of floating oxide layer structure, which is located in the N-type doped semiconductor drift region between the drain region and the buried oxide layer structure, and allows multiple Layer floating oxide layer structure to further optimize the distribution of the vertical electric field in the drain region, thereby improving the overall breakdown voltage of the device.

Figure 200910024963

Description

The lateral double-diffused metal-oxide-semiconductor transistor of N type silicon-on-insulator
Technical field
The present invention relates to the power semiconductor field, in particular, is the new construction that is applicable to the lateral double-diffused metal-oxide-semiconductor transistor (SOI LDMOS) of the silicon-on-insulator of high-voltage applications about a kind of.
Background technology
Because the device that adopts silicon-on-insulator material to make can be realized full dielectric isolation, its parasitic capacitance and leakage current are little, and drive current is big, so be well suited for making power IC device and circuit.For making SOI device that better effect be arranged, the puncture voltage that improves SOI device is an important research project.As everyone knows, withstand voltage its laterally withstand voltage and vertical withstand voltage reckling that depends on of silicon-on-insulator power device, the horizontal withstand voltage of device can be adopted field plate techniques, falls a layer technology, and the knot terminal technology of body silicon such as RESURF technology solves.But, become a difficult point in the research of silicon-on-insulator lateral power device because how the restriction of technology and structure improves the vertically withstand voltage of device.
Vertical puncture voltage of conventional soi structure is mainly born jointly by insulating barrier and active semiconductor layer, and the vertically withstand voltage V that is is arranged B=E (3D 1+ 0.5D 2), wherein E is the critical breakdown electric field of semiconductor layer, D 1And D 2Be respectively the thickness of insulation material layer and silicon epitaxial layers, obviously vertically withstand voltage with D 1And D 2Increase and improve.But if insulation material layer do too thick, one side process implementing difficulty is big and be unfavorable for that device dispels the heat, can cause the silicon warp distortion on the other hand, integrity problem appears in the high accuracy photoetching, if it is too thick that silicon epitaxial layers is done, then similar with the body silicon device, bring difficulty for simultaneously follow-up dielectric isolation technology.
Abroad the someone proposes to insert one deck N between insulation material layer and silicon epitaxial layers +Withstand voltage layer, the electric field that it can the shielding insulation material layer, the electric field of device silicon epitaxial layers subcritical breakdown electric field still when making electric field on insulation material layer reach very high, thus avoided device to cross as far back as Si/SiO 2Puncture on the interface, but on technology to N +When heat-treating, Withstand voltage layer has serious anti-expansion phenomenon.
The domestic people of having proposes the channel insulation structure of voltage-sustaining layer in a kind of silicon-on-insulator power device, it can introduce interface charge on the interface of silicon epitaxial layers and insulation material layer, full continuity according to electric displacement increases substantially the insulating barrier internal electric field, thereby it is vertically withstand voltage to improve device.But it makes most of zone of insulation material layer have bigger thickness, is unfavorable for the heat radiation of device, has also reduced bond strength, and the etching of required big measuring tank has also been brought the complexity of whole manufacture craft in addition.
Summary of the invention
The invention provides and a kind ofly can effectively improve vertically withstand voltagely, and help improving the lateral double-diffused metal-oxide-semiconductor transistor of N type silicon-on-insulator of the heat dispersion of power device.
The present invention adopts following technical scheme:
A kind of lateral double-diffused metal-oxide-semiconductor transistor of N type silicon-on-insulator, comprise: Semiconductor substrate, on Semiconductor substrate, be provided with and bury oxide layer, be provided with N type doped semiconductor area on the oxide layer burying, on N type doped semiconductor area, be provided with P trap and N type drain region, on the P trap, be provided with N type source region and P type contact zone, be provided with gate oxide and gate oxide on the surface of P trap and extend to N type doped semiconductor area from the P trap, N type source region on P trap surface, the N type drain region with exterior domain and N type doped semiconductor area surface of P type contact zone and gate oxide is provided with field oxide with exterior domain, be provided with the surface that polysilicon gate and polysilicon gate extend to field oxide on the surface of gate oxide, at field oxide, P type contact zone, N type source region, the surface in polysilicon gate and N type drain region is provided with oxide layer, in N type source region, P type contact zone, be connected with metal level respectively on polysilicon gate and the N type drain region, in N type doped semiconductor area, be provided with first oxide layer of floating, and first oxide layer of floating is positioned at the below in N type drain region.
Compared with prior art, the present invention has following advantage:
(1) structure of the present invention has the first oxide layer structure 121 of floating below drain region 10, the horizontal withstand voltage employing RESURF technical optimization of device is handled, only need to consider vertical pressure drop, reduce gradually and device is vertically anti-from drain terminal to the source end, first of the face that the leaks down oxide layer 121 of floating can be born higher field intensity, thus improve the whole withstand voltage of device.With reference to accompanying drawing 4, to float after the oxide layer structure 121 having added first, the electric field strength that oxide layer 8 is buried in the below, drain region obviously reduces, and first float and shared part electric field strength on the oxide layer 121, the area that curve enclosed is also bigger, and with reference to accompanying drawing 5, puncture voltage has improved greatly as can be seen.
(2) in the structure of the present invention, the first oxide layer structure 121 of floating is arranged under the drain terminal, reduced charge carrier ionization integration lengths, make disruptive critical voltage increase in silicon and the silicon dioxide, thereby can reduce to bury the thickness of oxide layer 8 greatly, certainly also reduce the technology difficulty that cutting in the silicon epitaxial layers and dielectric isolation realize.
(3) structure of the present invention only need be carried out the injection of window oxygen on the lateral double-diffused metal-oxide-semiconductor transistor surface of N type silicon-on-insulator, and do not need its lower zone is done any processing, this has just been avoided making buried structure or the special photoetching contraposition problem that can occur when burying oxide structure, has highly also kept heat dispersion preferably in withstand voltage bearing.
(4) structure of the present invention is except that window oxygen injects, and other processing step is compatible mutually with complementary bilateral diffusion metal oxide transistor (CDMOS) technology of standard, does not therefore need to revise intrinsic technological process.
Description of drawings
Fig. 1 is the lateral double-diffused metal-oxide-semiconductor transistor structural representation of high voltage N type SOI that does not add the conventional structure of the oxide layer structure of floating.
Fig. 2 has added the first lateral double-diffused metal-oxide-semiconductor transistor structural representation of high voltage N type SOI of oxide layer structure 121 of floating among the present invention.
Fig. 3 is the lateral double-diffused metal-oxide-semiconductor transistor structural representation that has added the high voltage N type SOI of two-layer float oxide layer 121 and 122 among the present invention.(allowing more multi-layered)
Fig. 4 does not add to have added first below, the drain region longitudinal electric field distribution comparison diagram of lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of oxide layer 121 of floating among the lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of conventional structure of the oxide layer of floating and the present invention, interpreting blueprints for convenience, the part of below, device drain region is placed the left side of longitudinal electric field distribution comparison diagram among the figure, the ordinate and the device lengthwise position of longitudinal electric field distribution comparison diagram are one to one.
Fig. 5 does not float to have added first the float puncture voltage of lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of oxide layer 121 and the analog result figure of epitaxial silicon layer thickness relation among the lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of conventional structure of oxide layer and the present invention.
Embodiment
With reference to Fig. 2, a kind of lateral double-diffused metal-oxide-semiconductor transistor of N type silicon-on-insulator, comprise: Semiconductor substrate 9, on Semiconductor substrate 9, be provided with and bury oxide layer 8, be provided with N type doped semiconductor area 7 on the oxide layer 8 burying, on N type doped semiconductor area 7, be provided with P trap 6 and N type drain region 10, on P trap 6, be provided with N type source region 11 and P type contact zone 13, be provided with gate oxide 3 and gate oxide 3 on the surface of P trap 6 and extend to N type doped semiconductor area 7 from P trap 6, N type source region 11 on P trap 6 surfaces, the N type drain region 10 with exterior domain and N type doped semiconductor area 7 surfaces of P type contact zone 13 and gate oxide 3 is provided with field oxide 1 with exterior domain, be provided with the surface that polysilicon gate 4 and polysilicon gate 4 extend to field oxide 1 on the surface of gate oxide 3, at field oxide 1, P type contact zone 13, N type source region 11, the surface in polysilicon gate 4 and N type drain region 10 is provided with oxide layer 5, in N type source region 11, P type contact zone 13, be connected with metal level 2 respectively on polysilicon gate 4 and the N type drain region 10, in N type doped semiconductor area 7, be provided with first float oxide layer 121 and first float oxide layer 121 be positioned at N type drain region 10 below.
Present embodiment also adopts following technical measures further to improve performance of the present invention:
With reference to Fig. 3, in N type doped semiconductor area 7, be provided with second oxide layer 122 of floating, and second oxide layer 122 of floating is positioned at first below of floating oxide layer 121.
First float the upper surface of oxide layer 121 apart from the lower surface in N type drain region 10 between 0.5 micron to 1 micron.
First floats oxide layer 121 thickness between 0.2 micron to 0.5 micron.
Second oxide layer 122 and first distance of floating between the oxide layer 121 of floating is no more than 0.5 micron.
First length of floating oxide layer 121 is 1 to 1.5 times of drain region 10 width.
Though present embodiment has adopted the two-layer oxide layer of floating, in the reality, allow below the drain region, to be provided with the multilayer oxide layer of floating, make the longitudinal electric field in device drain region further optimize, thereby further improve device electric breakdown strength.
The present invention adopts following method to prepare:
1, make needed silicon-on-insulator SOI substrate, it can adopt and annotate the oxygen partition method, other methods such as wafer bonding method (following is example to annotate the oxygen isolation method).Can adopt the special-purpose oxonium ion implanter of big line that oxonium ion is injected in the Silicon Wafer, implantation dosage is about 1E18/cm 2, in inert gas, carried out 〉=1300 ℃ of high annealings then 3 to 5 hours, thereby form thickness silicon epitaxial layers and insulation material layer as thin as a wafer uniformly at the Silicon Wafer top.
2, make buried oxide layer, it need cover the part that does not need to carry out the oxygen atom injection with a mask, adopts the high concentration oxygen atom to inject with the energy of counting million-electron-volt again.For one deck lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of oxide layer structure of floating only is set, only need carry out an oxygen atom and inject (1Mev is to 2Mev), in inert gas, carried out 〉=1300 ℃ of high annealings then 3 to 5 hours, thereby form continuous oxide layer in vivo, and for the two-layer or multilayer lateral double-diffused metal-oxide-semiconductor transistor of high voltage N type SOI of oxide layer of floating is set, then need to carry out twice or the injection of oxygen atom repeatedly, note twice or repeatedly inject the difference (3Mev is to 4Mev for the first time, and 1Mev is to 2Mev for the second time) of energy.Then carry out high annealing,, polish, make it the thickness that reaches required then with wafer thinning.
3, be the making of the lateral double-diffused metal-oxide-semiconductor transistor of routine, it comprises that P type trap injects, the preparation of field oxygen, the growth of grid oxygen, etching, the deposit of polysilicon, etching are exactly that leakage injection region, high concentration source contacts the injection region preparation with substrate then, be fairlead at last, the preparation of aluminum lead and Passivation Treatment.

Claims (6)

1、一种N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,包括:半导体衬底(9),在半导体衬底(9)上面设置有埋氧化层(8),在埋氧化层(8)上设有N型掺杂半导体区(7),在N型掺杂半导体区(7)上设有P阱(6)和N型漏区(10),在P阱(6)上设有N型源区(11)和P型接触区(13),在P阱(6)的表面设有栅氧化层(3)且栅氧化层(3)自P阱(6)延伸至N型掺杂半导体区(7),在P阱(6)表面的N型源区(11)、P型接触区(13)和栅氧化层(3)的以外区域及N型掺杂半导体区(7)表面的N型漏区(10)以外区域设有场氧化层(1),在栅氧化层(3)的表面设有多晶硅栅(4)且多晶硅栅(4)延伸至场氧化层(1)的表面,在场氧化层(1)、P型接触区(13)、N型源区(11)、多晶硅栅(4)及N型漏区(10)的表面设有氧化层(5),在N型源区(11)、P型接触区(13)、多晶硅栅(4)和N型漏区(10)上分别连接有金属层(2),其特征在于在N型掺杂半导体区(7)内设有第一浮置氧化层(121)且第一浮置氧化层(121)位于N型漏区(10)的下方。1. A lateral double-diffused metal oxide semiconductor transistor of N-type silicon on insulator, comprising: a semiconductor substrate (9), a buried oxide layer (8) is arranged on the semiconductor substrate (9), and a buried oxide layer ( 8) is provided with an N-type doped semiconductor region (7), is provided with a P well (6) and an N-type drain region (10) on the N-type doped semiconductor region (7), and is provided with a P well (6) There is an N-type source region (11) and a P-type contact region (13), and a gate oxide layer (3) is provided on the surface of the P well (6), and the gate oxide layer (3) extends from the P well (6) to the N-type The doped semiconductor region (7), the N-type source region (11), the P-type contact region (13) and the area outside the gate oxide layer (3) and the N-type doped semiconductor region (7) on the surface of the P well (6) ) on the surface of the N-type drain region (10) is provided with a field oxide layer (1), on the surface of the gate oxide layer (3) is provided with a polysilicon gate (4) and the polysilicon gate (4) extends to the field oxide layer (1 ), an oxide layer (5) is provided on the surface of the field oxide layer (1), the P-type contact region (13), the N-type source region (11), the polysilicon gate (4) and the N-type drain region (10), A metal layer (2) is respectively connected to the N-type source region (11), the P-type contact region (13), the polysilicon gate (4) and the N-type drain region (10), which is characterized in that the N-type doped semiconductor region (7) The first floating oxide layer (121) is arranged inside and the first floating oxide layer (121) is located under the N-type drain region (10). 2.根据权利要求1所述的N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,其特征在于在N型掺杂半导体区(7)内设有第二浮置氧化层(122)且第二浮置氧化层(122)位于第一浮置氧化层(121)的下方。2. The lateral double-diffused metal oxide semiconductor transistor of N-type silicon-on-insulator according to claim 1, characterized in that a second floating oxide layer (122) is provided in the N-type doped semiconductor region (7) and The second floating oxide layer (122) is located under the first floating oxide layer (121). 3.根据权利要求1或2所述的N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,其特征在于第一浮置氧化层(121)的上表面距离N型漏区(10)的下表面在0.5微米到1微米之间。3. The lateral double-diffused metal-oxide-semiconductor transistor of N-type silicon-on-insulator according to claim 1 or 2, characterized in that the upper surface of the first floating oxide layer (121) is at a distance from the N-type drain region (10) The lower surface is between 0.5 micron and 1 micron. 4.根据权利要求3所述的N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,其特征在于第一浮置氧化层(121)厚度在0.2微米到0.5微米之间。4. The N-type silicon-on-insulator lateral double-diffused metal-oxide-semiconductor transistor according to claim 3, characterized in that the thickness of the first floating oxide layer (121) is between 0.2 microns and 0.5 microns. 5.根据权利要求3所述的N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,其特征在于第二浮置氧化层(122)与第一浮置氧化层(121)之间距离不超过0.5微米。5. The lateral double-diffused metal oxide semiconductor transistor of N-type silicon-on-insulator according to claim 3, characterized in that the distance between the second floating oxide layer (122) and the first floating oxide layer (121) is not more than 0.5 microns. 6.根据权利要求3所述的N型绝缘体上硅的横向双扩散金属氧化物半导体晶体管,其特征在于第一浮置氧化层(121)的长度为漏区(10)宽度的1到1.5倍。6. The N-type silicon-on-insulator lateral double-diffused metal oxide semiconductor transistor according to claim 3, characterized in that the length of the first floating oxide layer (121) is 1 to 1.5 times the width of the drain region (10) .
CNA2009100249634A 2009-02-27 2009-02-27 N type SOI lateral double-diffused metal-oxide semiconductor transistor Pending CN101488526A (en)

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CN102082169A (en) * 2010-12-08 2011-06-01 四川长虹电器股份有限公司 Partial SOI (silicon on insulator) traverse double-diffused device
CN102088031A (en) * 2009-12-03 2011-06-08 无锡华润上华半导体有限公司 N-type laterally diffused metal oxide semiconductor (NLDMOS) device and manufacturing method thereof
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CN102088031A (en) * 2009-12-03 2011-06-08 无锡华润上华半导体有限公司 N-type laterally diffused metal oxide semiconductor (NLDMOS) device and manufacturing method thereof
WO2011066802A1 (en) * 2009-12-03 2011-06-09 Csmc Technologies Fab1 Co., Ltd. N type lateral double diffused metal oxide semiconductor device and manufacturing method thereof
CN102082169B (en) * 2010-12-08 2012-07-25 四川长虹电器股份有限公司 Partial SOI (silicon on insulator) traverse double-diffusion device
CN102082169A (en) * 2010-12-08 2011-06-01 四川长虹电器股份有限公司 Partial SOI (silicon on insulator) traverse double-diffused device
CN102637736A (en) * 2011-02-10 2012-08-15 上海宏力半导体制造有限公司 High-voltage LDMOS (high-voltage-lateral diffused metal oxide semiconductor) component
CN102637736B (en) * 2011-02-10 2014-06-25 上海华虹宏力半导体制造有限公司 High-voltage LDMOS (high-voltage-lateral diffused metal oxide semiconductor) component
CN102176469A (en) * 2011-03-10 2011-09-07 杭州电子科技大学 SOI (Silicon on Insulator) nLDMOS (n-Channel Lateral Diffused Metal Oxide Semiconductor) device unit with p buried layer
CN102280472A (en) * 2011-08-07 2011-12-14 东南大学 N-type electrostatic protection semiconductor device with high maintaining voltage
CN102412162B (en) * 2011-11-23 2014-04-16 上海华虹宏力半导体制造有限公司 Method for improving breakdown voltage of N-groove laterally diffused metal oxide semiconductor (LDMOS)
CN102412162A (en) * 2011-11-23 2012-04-11 上海华虹Nec电子有限公司 The Method of Improving the Breakdown Voltage of NLDMOS
CN103296063B (en) * 2012-03-01 2016-05-25 台湾积体电路制造股份有限公司 For the apparatus and method of high voltage MOS transistor
CN103296063A (en) * 2012-03-01 2013-09-11 台湾积体电路制造股份有限公司 Apparatus and method for high voltage MOS transistor
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CN103325835B (en) * 2013-05-28 2015-10-21 电子科技大学 A kind of SOI power LDMOS device with junction type field plate
CN103268890A (en) * 2013-05-28 2013-08-28 电子科技大学 A Power LDMOS Device with Junction Field Plate
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CN107123681B (en) * 2016-02-25 2022-03-01 瑞萨电子株式会社 Semiconductor device and method of manufacturing the same
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CN105870189B (en) * 2016-04-21 2019-07-19 西安电子科技大学 A Lateral Superjunction Double Diffused Metal Oxide Semiconductor Field Effect Transistor with Bulk Electric Field Modulation Effect
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