WO2011160591A1 - Vdmos器件及其制作方法 - Google Patents
Vdmos器件及其制作方法 Download PDFInfo
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- WO2011160591A1 WO2011160591A1 PCT/CN2011/076175 CN2011076175W WO2011160591A1 WO 2011160591 A1 WO2011160591 A1 WO 2011160591A1 CN 2011076175 W CN2011076175 W CN 2011076175W WO 2011160591 A1 WO2011160591 A1 WO 2011160591A1
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- epitaxial layer
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- semiconductor substrate
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/64—Double-diffused metal-oxide semiconductor [DMOS] FETs
- H10D30/66—Vertical DMOS [VDMOS] FETs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
- H10D12/01—Manufacture or treatment
- H10D12/031—Manufacture or treatment of IGBTs
- H10D12/032—Manufacture or treatment of IGBTs of vertical IGBTs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
- H10D12/411—Insulated-gate bipolar transistors [IGBT]
- H10D12/441—Vertical IGBTs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/01—Manufacture or treatment
- H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
- H10D30/028—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs
- H10D30/0291—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs of vertical DMOS [VDMOS] FETs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/01—Manufacture or treatment
- H10D62/051—Forming charge compensation regions, e.g. superjunctions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/102—Constructional design considerations for preventing surface leakage or controlling electric field concentration
- H10D62/103—Constructional design considerations for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse-biased devices
- H10D62/105—Constructional design considerations for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse-biased devices by having particular doping profiles, shapes or arrangements of PN junctions; by having supplementary regions, e.g. junction termination extension [JTE]
- H10D62/109—Reduced surface field [RESURF] PN junction structures
- H10D62/111—Multiple RESURF structures, e.g. double RESURF or 3D-RESURF structures
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/17—Semiconductor regions connected to electrodes not carrying current to be rectified, amplified or switched, e.g. channel regions
- H10D62/393—Body regions of DMOS transistors or IGBTs
Definitions
- the present invention relates to power devices, and more particularly to a method of fabricating a VDMOS device using a selective epitaxial process and a structure of a VDMOS device. Background technique
- VDM0S Vertical double-diffused metal oxide semiconductor field effect transistors
- a method of fabricating a VDM0S device is disclosed in the Chinese Patent Application No. 200810057881.5, specifically to FIG. 1 to FIG.
- FIG. 1 first, an N-type semiconductor substrate 100 is provided, and an N-type epitaxial layer 101 is formed on the N-type semiconductor substrate 100; then, a gate oxide layer 111 is sequentially formed over the N-type epitaxial layer 101. And a polysilicon gate layer 108 over the gate oxide layer 111.
- the N-type epitaxial layer 101 is P-well implanted to form a P-well 107, and the P-well 107 is located in the poly gate layer.
- ion implantation is performed on the N-type epitaxial layer 101 under the P well 107 to form a P-type barrier layer 104; then, referring to FIG. 3, heavily doped ion implantation is performed, in the P well 107.
- a drain metal layer 112 is formed on the back surface of the semiconductor substrate 100, and the back surface refers to the opposite surface of the device growth surface on the semiconductor substrate 100.
- the gate metal layer 109 and the polysilicon gate layer 108 together form a gate G.
- the source metal layer 110 and the N-type heavily doped region 106 together form a source S, the drain metal layer 112 and the semiconductor village.
- the bottom 100 constitutes the drain D.
- the p-type barrier layer formed by the prior art has poor uniformity of doping impurities, which increases the on-voltage drop and channel resistance of the VDMOS device.
- the prior art performs multiple ion implantation on the N-type epitaxial layer 101.
- a P-type barrier layer is formed on both sides of the N-type epitaxial layer 101.
- multiple ion implantation and high temperature annealing steps have complicated processes, poor uniformity of ion implantation, and high manufacturing cost.
- the invention provides a manufacturing method of a VDM0S device, which can form a P-type barrier layer with better uniformity, and has a single process, is easy to control, and has low manufacturing cost.
- the present invention provides a method for fabricating a VDM0S device, including: providing a semiconductor substrate, wherein a first N-type epitaxial layer is formed on the semiconductor substrate; and forming over the first N-type epitaxial layer a hard mask layer having an opening;
- the material of the first N-type epitaxial layer is epitaxial single crystal silicon, and the thickness ranges from 5 to 20 meters, and the resistivity ranges from 30 to 60 ohms ⁇ cm.
- the material of the P-type barrier layer is epitaxial single crystal silicon, and the resistivity is 10 to 20 ohm ⁇ cm.
- the material of the second N-type epitaxial layer is epitaxial single crystal silicon, and has a thickness ranging from 3 to 5 meters and a resistivity of 30 to 60 ohms ⁇ cm.
- the forming method of the P-type barrier layer is a selective epitaxy method.
- the material of the hard mask layer is selected from the group consisting of silicon oxide, silicon nitride, and low temperature oxide.
- doping concentration and doping of the second N-type epitaxial layer and the first N-type epitaxial layer The same type.
- the present invention further provides a VDMOS device, comprising: a semiconductor substrate, a first N-type epitaxial layer located in a semiconductor substrate, further comprising: a first N-type epitaxy on both sides of the first N-type epitaxial layer a P-type barrier layer having the same layer thickness; a second N-type epitaxial layer above the first N-type epitaxial layer and the P-type barrier layer, a gate on the second N-type epitaxial layer, and a gate electrode
- the source in the second N-type epitaxial layer on the side is located at the drain of the back surface of the semiconductor substrate corresponding to the gate and the source.
- the material of the first N-type epitaxial layer is epitaxial single crystal silicon, and the thickness ranges from 5 to 20 meters, and the resistivity ranges from 30 to 60 ohms ⁇ cm.
- the material of the P-type barrier layer is epitaxial single crystal silicon, and the resistivity is 10-20 ohm ⁇ cm.
- the material of the second N-type epitaxial layer is epitaxial single crystal silicon, and has a thickness ranging from 3 to 5 meters and a resistivity of 30 to 60 ohms ⁇ cm.
- the present invention has the following advantages:
- the method does not require high-energy ion implantation, and does not require multiple ion implantation and high-temperature annealing, and is formed at one time.
- a better P-type barrier layer the method is simple, easy to control, and reduces the manufacturing cost of the VDMOS device.
- FIG. 4 are schematic cross-sectional structural views showing a method of fabricating a VDMOS device of the prior art
- FIG. 5 is a flow chart showing a method for fabricating a VDMOS device of the present invention
- 6 to 12 are schematic cross-sectional structural views showing a method of fabricating a VDMOS device of the present invention. detailed description
- the structure of the first feature described below "on" the second feature may include embodiments in which the first and second features are formed in direct contact, and may include additional features formed between the first feature and the second feature. The embodiment, such that the first and second features may not be in direct contact.
- the prior art increases the doping concentration of the first N-type epitaxial layer, and forms the same thickness on both sides of the first N-type epitaxial layer as the first N-type epitaxial layer. P-type barrier.
- the prior art is divided into a plurality of epitaxial steps to form a first N-type epitaxial layer, wherein each epitaxial step forms a sub-epitaxial layer having a thickness that is a portion of the thickness of the first N-type epitaxial layer.
- P-type ion implantation is performed on the sub-epitaxial layer at a certain oblique angle (for example, 45 degrees), and a sub-blocking layer is formed on both sides of the sub-epitaxial layer until a plurality of sub-epitaxial layers are formed.
- the first N-type epitaxial layer, the sub-barrier layer on both sides of the sub-epitaxial layer constitutes a P-type barrier layer.
- the prior art also requires a high temperature annealing step after P-type ion implantation.
- FIG. 5 is a schematic flow chart of a method for fabricating a VDMOS device according to the present invention. The method includes:
- Step S1 providing a semiconductor substrate, a first N-type epitaxial layer is formed on the semiconductor substrate; Step S2, forming a hard mask layer having an opening above the first N-type epitaxial layer; Step S3, along the Opening etches the first N-type epitaxial layer to expose the semiconductor substrate to form a P-type barrier pattern;
- Step S4 forming a P-type barrier layer in the P-type barrier pattern, which is the same thickness as the first N-type epitaxial layer;
- Step S5 removing the hard mask layer
- Step S6 forming a second N-type epitaxial layer on the first N-type epitaxial layer and the P-type barrier layer; Step S7, forming a gate above the second N-type epitaxial layer, on both sides of the gate A source is formed in the two N-type epitaxial layers, and a drain is formed on the back surface of the semiconductor substrate corresponding to the gate and the source.
- FIG. 6 to FIG. 12 are schematic cross-sectional structural views of the manufacturing method of the VDMOS device of the present invention.
- a semiconductor substrate 200 is provided.
- the conductivity type of the semiconductor substrate 200 is N-type.
- a first N-type epitaxial layer 201 is formed over the semiconductor substrate 200.
- the material of the first N-type epitaxial layer 201 is epitaxial single crystal silicon, and the resistivity ranges from 30 to 60 ohm ⁇ cm, the thickness ranges from 5 to 20 micrometers, the doping impurity is AS, and the impurity concentration range is lE13. ⁇ lE15cm- 2 .
- a hard mask layer 202 is deposited over the first N-type epitaxial layer 201.
- the material of the hard mask layer 202 is selected from silicon oxide or silicon nitride.
- the material of the hard mask layer 202 is selected from silicon oxide and has a thickness ranging from 300 to 500 angstroms.
- the formation method may be a thermal oxidation method and a low temperature oxidation method.
- the material of the hard mask layer 202 may be silicon nitride, and the thickness thereof ranges from 500 to 3500 angstroms, and the formation method may be a low pressure vapor deposition method; when the hard mask layer 202 In the case of silicon nitride, a buffer oxide layer having a thickness of 20 to 100 angstroms is further included between the hard mask layer 202 and the first N-type epitaxial layer 201 for buffering the hard mask layer 202 and the first N-type epitaxial layer. Stress between 202. Next, referring to FIG. 7, a photoresist pattern 203 is formed over the hard mask layer 202.
- the photoresist pattern 203 covers a portion of the hard mask layer 202, and the photoresist pattern 203 is used as a mask for dry etching. In the etching process, the hard mask layer 202 not protected by the photoresist pattern 203 is removed, and an opening d is formed in the hard mask layer 202. It should be noted that, as an illustration, only the hard mask layer 202 between the two openings d is shown in FIG.
- the photoresist pattern 203 is retained, and the same etching machine etching the hard mask layer 202 is used along the edge.
- the opening d is etched until the semiconductor substrate 200 is exposed to form a P-type barrier pattern 215, which can reduce the time for exposing the product to air and reduce particle contamination of the product.
- a wet etching process is performed to remove the photoresist pattern 203.
- a P-type barrier layer 204 is formed in the P-type barrier pattern 215, which is the same thickness as the first N-type epitaxial layer 201.
- the P-type barrier layer 204 is formed by a selective epitaxial process.
- the material of the P-type barrier layer 204 is epitaxial single crystal silicon, and the resistivity is 10-20 ohm ⁇ cm.
- a wet etching process may be performed to remove the photoresist pattern. Thereafter, dry etching is performed along the opening until the semiconductor substrate is exposed to form a P-type barrier pattern. Then, a P-type barrier layer is formed in the P-type barrier pattern.
- the material of the P-type barrier layer is epitaxial single crystal silicon, and the resistivity is 10-20 ohm ⁇ cm.
- an etching process is performed to remove the hard mask layer 202 to expose the remaining first N-type epitaxial layer 201; above the remaining first N-type epitaxial layer 201 and the P-type barrier layer 204.
- a second N-type epitaxial layer 205 is formed.
- the material of the second N-type epitaxial layer 205 is epitaxial single crystal silicon, and has a thickness ranging from 3 to 5 micrometers and a resistivity ranging from 10 to 20 ohms ⁇ cm.
- the second N-type epitaxial layer 205 and the first N-type epitaxial layer 201 are formed by the same epitaxial deposition parameter, thereby ensuring the resistivity and doping concentration, doping type and first N-type epitaxy of the second N-type epitaxial layer 205.
- Layer 201 is identical.
- a P-type barrier layer 204 having an opposite conductivity type is formed on both sides of the first N-type epitaxial layer 201, the thickness of the P-type barrier layer 204 and the first N-type epitaxial layer. 201 is the same.
- the resistivity of the P-type epitaxial layer 204 needs to be specifically set according to the doping concentration and resistivity of the P-type barrier layer of the prior art. Since only one process step is used to form a P-type barrier Compared with the prior art, the multi-epitaxial process, the multiple ion implantation and the high-temperature annealing process greatly reduce the process steps, reduce the process complexity, and reduce the manufacturing cost of the VDMOS device.
- an oxide layer is deposited on the second N-type epitaxial layer 205, and the oxide layer is etched to form a gate dielectric layer 211.
- the width of the gate dielectric layer 211 is greater than the width of the second N-type epitaxial layer 205 below it.
- the thickness of the gate dielectric layer 211 ranges from 30 to 1000 angstroms.
- Polysilicon is deposited on the gate dielectric layer 211 and etched to form a polysilicon gate layer 208 having a thickness in the range of 1000 to 4000 angstroms.
- P-well implantation is performed in the second N-type epitaxial layer 205 on both sides of the gate dielectric layer 211 and the polysilicon gate 208 to form a P well 207.
- the P well 207 is in contact with the P-type barrier layer 204, the first N-type epitaxial layer 205, and the width of the P-well 207 is greater than the width of the P-type barrier layer 204 below it.
- the P-well implanted element is ⁇ BF 2
- the energy range is
- the dose range is lE12 ⁇ lE13cm- 2 .
- N-type heavily doped ion implantation is performed in the P well 207 to form an N-type heavily doped region 206.
- the element of the N-type heavily doped ion implantation is P, As, the energy range is 50 ⁇ 130KEV, and the dose range is 1E15 ⁇ 2E16 cm- 2 .
- a metallization process is performed on the device, a source metal layer 210 is formed over the N-type heavily doped region 206, and a gate metal layer 209 is formed over the polysilicon gate layer 208;
- the substrate 200 is subjected to backside thinning and a back metal process, and a drain metal layer 212 is formed on the back surface of the semiconductor substrate 200 corresponding to the polysilicon gate layer 208 and the N-type heavily doped region 206.
- the back side of the present invention refers to the opposite side of the growth surface of the device on the semiconductor substrate 200.
- the polysilicon gate layer 208 and the gate metal layer 209 form the gate G of the VDMOS device.
- the N-type heavily doped region 206 and the source metal layer 210 together form the source S of the VDMOS device.
- the bottom 200 and the drain metal layer 212 together form the drain of the VDMOS.
- the present invention further provides a VDMOS device.
- the device includes: an N-type semiconductor substrate 200; a first N-type epitaxial layer 201 located above the semiconductor substrate 200, located at the first N a P-type barrier layer 204 having the same thickness as the first N-type epitaxial layer 201 on both sides of the epitaxial layer 201; a second N-type epitaxial layer 205 located above the first N-type epitaxial layer 201 and the P-type barrier layer 204, a source S of the VDMOS located above the second N-type epitaxial layer 205, a gate G located in the second N-type epitaxial layer 205 on both sides of the source S, under the gate S and the source G The drain D of the VDMOS on the back of the semiconductor substrate 200.
- the back side of the present invention refers to the opposite side of the growth surface of the device on the semiconductor substrate 200.
- the source S is composed of a P well 207 located above the P-type barrier layer 204, an N-type heavily doped region 206 located within the P-well 207, and a source metal 210 over the N-type heavily doped region 206.
- the gate G is composed of a polysilicon gate layer 208 over the second N-type epitaxial layer 205 and a gate metal layer 209 over the polysilicon gate layer 208.
- the drain D is composed of the semiconductor substrate 200 and a drain metal layer 212 on the back surface of the semiconductor substrate 200.
- the P well 207 is in contact with the first N-type epitaxial layer 201 and the P-type barrier layer 204, and the width of the P well 207 is greater than the width of the P-type barrier layer 204.
- the material of the first N-type epitaxial layer 201 is epitaxial single crystal silicon, and the thickness ranges from 5 to 20 micrometers, and the resistivity ranges from 30 to 60 ohm ⁇ cm.
- the material of the P-type barrier layer 204 is epitaxial single crystal silicon, and the resistivity is 10-20 ohm ⁇ cm.
- the material of the second N-type epitaxial layer 205 is epitaxial single crystal silicon, and has a thickness ranging from 3 to 5 micrometers and a resistivity of 30 to 60 ohm.cm.
- the method for fabricating a VDMOS device can also be used to fabricate an Insulated Gate Bipolar Transistor (IGBT).
- the method includes: providing a semiconductor substrate, a first N-type epitaxial layer is formed on the semiconductor substrate; forming a hard mask layer having an opening above the first N-type epitaxial layer; Opening-etching the first N-type epitaxial layer to expose the semiconductor substrate to form a P-type barrier pattern; forming a P-type barrier layer in the P-type barrier pattern, having the same thickness as the first N-type epitaxial layer; a hard mask layer; forming a second N-type epitaxial layer on the first N-type epitaxial layer and the P-type barrier layer; forming a gate above the second N-type epitaxial layer on both sides of the gate A source is formed in the second N-type epitaxial layer, and a drain is formed on the back surface of the semiconductor substrate corresponding to the gate and the source. Prior to fabrication of the drain,
- the present invention provides a VDMOS device and a method of fabricating the same, which form a P-type barrier layer directly on both sides of the first N-type epitaxial layer, which reduces the fabrication steps of the VDMOS device and reduces the fabrication cost of the VDMOS device.
- the method can also be used to fabricate an insulated gate bipolar transistor.
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- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013514546A JP2013532379A (ja) | 2010-06-25 | 2011-06-23 | Vdmos装置およびその製造方法 |
| US13/695,013 US20130037878A1 (en) | 2010-06-25 | 2011-06-23 | Vdmos device and method for fabricating the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102133404A CN102299073A (zh) | 2010-06-25 | 2010-06-25 | Vdmos器件及其制作方法 |
| CN201010213340.4 | 2010-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011160591A1 true WO2011160591A1 (zh) | 2011-12-29 |
Family
ID=45359393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2011/076175 Ceased WO2011160591A1 (zh) | 2010-06-25 | 2011-06-23 | Vdmos器件及其制作方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20130037878A1 (zh) |
| JP (1) | JP2013532379A (zh) |
| CN (1) | CN102299073A (zh) |
| WO (1) | WO2011160591A1 (zh) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170236930A1 (en) * | 2014-09-29 | 2017-08-17 | Wuxi China Resources Huajing Microelectronics Co | Vertical double-diffused metal-oxide semiconductor field-effect transistor and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ME03557B (me) | 2013-03-15 | 2020-07-20 | G1 Therapeutics Inc | Privremena zaštiтa normalnih ćelija током hemoterapije |
| CN103151268B (zh) | 2013-03-21 | 2016-02-03 | 矽力杰半导体技术(杭州)有限公司 | 一种垂直双扩散场效应管及其制造工艺 |
| CN104517832B (zh) * | 2013-09-27 | 2017-09-29 | 无锡华润上华半导体有限公司 | 功率二极管的制备方法 |
| CN104576359B (zh) * | 2013-10-23 | 2017-10-27 | 无锡华润上华科技有限公司 | 功率二极管的制备方法 |
| CN105576025A (zh) * | 2014-10-15 | 2016-05-11 | 无锡华润华晶微电子有限公司 | 一种浅沟槽半超结vdmos器件及其制造方法 |
| CN107871664A (zh) * | 2016-09-26 | 2018-04-03 | 北大方正集团有限公司 | 超结功率器件及其制造方法 |
| EP3748689A1 (en) * | 2019-06-06 | 2020-12-09 | Infineon Technologies Dresden GmbH & Co . KG | Semiconductor device and method of producing the same |
| CN116235302B (zh) * | 2020-08-24 | 2025-12-19 | 苏州晶湛半导体有限公司 | 半导体结构及其制备方法 |
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- 2010-06-25 CN CN2010102133404A patent/CN102299073A/zh active Pending
-
2011
- 2011-06-23 US US13/695,013 patent/US20130037878A1/en not_active Abandoned
- 2011-06-23 WO PCT/CN2011/076175 patent/WO2011160591A1/zh not_active Ceased
- 2011-06-23 JP JP2013514546A patent/JP2013532379A/ja active Pending
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| JP2009070849A (ja) * | 2007-09-10 | 2009-04-02 | Rohm Co Ltd | 半導体装置 |
| CN101515547A (zh) * | 2008-02-20 | 2009-08-26 | 中国科学院微电子研究所 | 制备超结vdmos器件的方法 |
| CN101692426A (zh) * | 2009-10-14 | 2010-04-07 | 上海宏力半导体制造有限公司 | 一种垂直双扩散mos晶体管的制备方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170236930A1 (en) * | 2014-09-29 | 2017-08-17 | Wuxi China Resources Huajing Microelectronics Co | Vertical double-diffused metal-oxide semiconductor field-effect transistor and manufacturing method therefor |
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| CN102299073A (zh) | 2011-12-28 |
| JP2013532379A (ja) | 2013-08-15 |
| US20130037878A1 (en) | 2013-02-14 |
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