DE102022205957A1 - Power FinFET with variable trench width - Google Patents
Power FinFET with variable trench width Download PDFInfo
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- DE102022205957A1 DE102022205957A1 DE102022205957.3A DE102022205957A DE102022205957A1 DE 102022205957 A1 DE102022205957 A1 DE 102022205957A1 DE 102022205957 A DE102022205957 A DE 102022205957A DE 102022205957 A1 DE102022205957 A1 DE 102022205957A1
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- 239000004065 semiconductor Substances 0.000 claims description 10
- 239000002019 doping agent Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
- H01L29/0623—Buried supplementary region, e.g. buried guard ring
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/4238—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the surface lay-out
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
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- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/42376—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the length or the sectional shape
Abstract
Power-FinFET (100, 200) mit ersten Gräben (108, 208), die entlang der Querrichtung (103, 203) angeordnet sind, wobei die ersten Gräben (108, 208) erste Grabenseitenwände (110, 210) und zweite Grabenseitenwände (111, 211) aufweisen, wobei die ersten Grabenseitenwände (110, 210) eine erste Struktur mit einer Periode und die zweiten Grabenseitenwände (111, 211) eine zweite Struktur mit der Periode entlang der Längsrichtung (102, 202) aufweisen, wobei erste Gräben (108, 208), die entlang der Querrichtung (103, 203) aufeinander folgen, einen Phasenversatz von der halben Periode entlang der Längsrichtung (102, 202) aufweisen und die erste Struktur innerhalb der Periode entlang der Querrichtung (103, 203) mindestens ein erstes Maximum aufweist und die zweite Struktur innerhalb der Periode entlang der Querrichtung (103, 203) mindestens ein erstes Minimum aufweist, wobei sich das mindestens eine erste Maximum und das mindestens eine erste Minimum gegenüberliegen, wobei unterhalb der ersten Gräben (108, 208) Abschirmgebiete (112, 212) angeordnet sind, wobei die Abschirmgebiete (112, 212) im Bereich des mindestens einen ersten Maximums und des mindestens einen zweiten Maximums mit dem zweiten Anschlussbereich (107, 207) elektrisch leitend verbunden sind, und Finnen (113, 213) zwischen den ersten Gräben (108, 208) angeordnet sind, die eine Finnenbreite kleiner als 500 nm aufweisen.Power FinFET (100, 200) with first trenches (108, 208) which are arranged along the transverse direction (103, 203), the first trenches (108, 208) having first trench side walls (110, 210) and second trench side walls (111 , 211), wherein the first trench side walls (110, 210) have a first structure with a period and the second trench side walls (111, 211) have a second structure with the period along the longitudinal direction (102, 202), wherein first trenches (108 , 208), which follow one another along the transverse direction (103, 203), have a phase offset of half the period along the longitudinal direction (102, 202) and the first structure within the period along the transverse direction (103, 203) has at least a first maximum and the second structure has at least one first minimum within the period along the transverse direction (103, 203), the at least one first maximum and the at least one first minimum being opposite one another, with shielding regions (112) below the first trenches (108, 208). , 212), the shielding regions (112, 212) being electrically conductively connected to the second connection region (107, 207) in the region of the at least one first maximum and the at least one second maximum, and fins (113, 213) between the first trenches (108, 208) are arranged, which have a fin width of less than 500 nm.
Description
Die Erfindung betrifft einen Power-FinFET mit variabler Grabenbreite.The invention relates to a power FinFET with variable trench width.
Stand der TechnikState of the art
In der Leistungselektronik finden Halbleiter mit großem Bandabstand wie SiC oder GaN Anwendung. Dabei werden typischerweise Leistungs-MOSFETs mit vertikalem Kanalgebiet eingesetzt.Semiconductors with a large band gap such as SiC or GaN are used in power electronics. Power MOSFETs with a vertical channel area are typically used.
Um die Durchbruchspannung solcher Leistungs-MOSFETs zu erhöhen, werden Abschirmgebiete unterhalb der Gräben angeordnet. Da diese Abschirmgebiete mit den Source-Bereichen verbunden sind, ist es notwendig zweigeteilte Steuerelektroden innerhalb der Gräben anzuordnen, wie in der Schrift
Nachteilig ist hierbei, dass die Gräben sehr breit angelegt werden müssen, sodass das Pitch-Maß und der Einschaltwiderstand des Leistungs-MOSFETs groß sind.The disadvantage here is that the trenches have to be very wide, so that the pitch dimension and the on-resistance of the power MOSFET are large.
Zwischen den üblicherweise p-dotierten Abschirmgebieten bildet sich ein sogenannter JFET aus, der dazu dient den Strom durch das Kanalgebiet im Kurzschlussfall zu begrenzen. Dazu werden p-dotierte Abschirmgebiete unter zuhilfenahme einer lithographisch strukturierten Maske implantiert.A so-called JFET is formed between the usually p-doped shielding regions, which serves to limit the current through the channel region in the event of a short circuit. For this purpose, p-doped shielding regions are implanted using a lithographically structured mask.
Nachteilig ist hierbei, dass dadurch die Abstände zwischen zwei p-dotierten Abschirmgebieten Prozessschwankungen ausgesetzt sind, die die Begrenzung des Kurzschlussstroms beeinflussen.The disadvantage here is that the distances between two p-doped shielding regions are exposed to process fluctuations that influence the limitation of the short-circuit current.
Die Aufgabe der Erfindung ist es, diese Nachteile zu überwinden.The object of the invention is to overcome these disadvantages.
Offenbarung der ErfindungDisclosure of the invention
Der Power-FinFET umfasst einen Halbleiterkörper, der eine Längsrichtung und eine Querrichtung aufweist, wobei die Längsrichtung senkrecht zur Querrichtung angeordnet ist. Der Halbleiterkörper umfasst einen ersten Anschlussbereich, eine Driftschicht, einen Kanalbereich und einen zweiten Anschlussbereich. Der zweite Anschlussbereich ist auf dem Kanalbereich, der Kanalbereich auf der Driftschicht und die Driftschicht auf dem ersten Anschlussbereich angeordnet. Erste Gräben reichen vom zweiten Anschlussbereich bis in die Driftschicht. Erfindungsgemäß sind erste Gräben entlang der Querrichtung angeordnet, wobei die ersten Gräben erste Grabenseitenwände und zweite Grabenseitenwände aufweisen, wobei die ersten Grabenseitenwände eine erste Struktur mit einer Periode und die zweiten Grabenseitenwände eine zweite Struktur mit der Periode entlang der Längsrichtung aufweisen, wobei erste Gräben, die entlang der Querrichtung aufeinander folgen, einen Phasenversatz von der halben Periode entlang der Längsrichtung aufweisen. Die erste Struktur weist innerhalb der Periode entlang der Querrichtung mindestens ein erstes Maximum auf und die zweite Struktur weist innerhalb der Periode entlang der Querrichtung mindestens ein erstes Minimum auf, wobei sich das mindestens eine erste Maximum und das mindestens eine erste Minimum gegenüberliegen. Unterhalb der ersten Gräben sind Abschirmgebiete angeordnet, wobei die Abschirmgebiete im Bereich des mindestens einen ersten Maximums und des mindestens einen ersten Minimums mit dem zweiten Anschlussbereich elektrisch leitend verbunden sind. Finnen sind zwischen den ersten Gräben angeordnet, die eine Finnenbreite kleiner als 500 nm aufweisen.The Power FinFET includes a semiconductor body that has a longitudinal direction and a transverse direction, the longitudinal direction being arranged perpendicular to the transverse direction. The semiconductor body includes a first connection region, a drift layer, a channel region and a second connection region. The second connection region is arranged on the channel region, the channel region on the drift layer and the drift layer on the first connection region. The first trenches extend from the second connection area into the drift layer. According to the invention, first trenches are arranged along the transverse direction, the first trenches having first trench side walls and second trench side walls, the first trench side walls having a first structure with a period and the second trench side walls having a second structure with the period along the longitudinal direction, wherein first trenches which follow each other along the transverse direction, have a phase offset of half the period along the longitudinal direction. The first structure has at least one first maximum within the period along the transverse direction and the second structure has at least one first minimum within the period along the transverse direction, the at least one first maximum and the at least one first minimum being opposite one another. Shielding regions are arranged below the first trenches, the shielding regions being electrically conductively connected to the second connection region in the region of the at least one first maximum and the at least one first minimum. Fins are arranged between the first trenches, which have a fin width of less than 500 nm.
Der Vorteil ist hierbei, dass der Pitch der Gesamtstruktur minimal ist.The advantage here is that the pitch of the overall structure is minimal.
In einer Weiterbildung sind die erste Struktur und die zweite Struktur wellenförmig.In a further development, the first structure and the second structure are wave-shaped.
Vorteilhaft ist hierbei, dass die zwischen den Gräben befindlichen Finnen überall die selbe Breite aufweisen und somit keine Feldüberhöhungen durch scharfe Kanten auftreten.The advantage here is that the fins located between the trenches have the same width everywhere and therefore no field elevations due to sharp edges occur.
In einer weiteren Ausgestaltung sind die erste Struktur und die zweite Struktur rechteckförmig.In a further embodiment, the first structure and the second structure are rectangular.
Der Vorteil ist hierbei, dass die Grabenseitenwände kostengünstig hergestellt werden können.The advantage here is that the trench side walls can be manufactured inexpensively.
In einer weiteren Ausgestaltung sind die erste Struktur und die zweite Struktur dreieckförmig.In a further embodiment, the first structure and the second structure are triangular.
Vorteilhaft ist hierbei, dass die Grabenseitenwände gezielt an Kristallachsen entlang laufen können.The advantage here is that the trench side walls can run specifically along crystal axes.
In einer weiteren Ausgestaltung sind die erste Struktur und die zweite Struktur sinusförmig.In a further embodiment, the first structure and the second structure are sinusoidal.
Der Vorteil ist hierbei, dass eine gleichmäßige Verrundung der Seitenwand auftritt.The advantage here is that the side wall is rounded evenly.
In einer Weiterbildung reichen zweite Gräben ausgehend vom zweiten Anschlussbereich bis in die Driftschicht, wobei die zweiten Gräben zwischen den ersten Gräben angeordnet sind und die zweiten Gräben äquidistant beabstandet zu den ersten Gräben angeordnet sind.In a further development, second trenches extend from the second connection area into the drift layer, the second trenches being arranged between the first trenches and the second trenches being arranged equidistantly from the first trenches.
Vorteilhaft ist hierbei, dass die kurzschlussstrombegrenzende Wirkung zwischen den Abschirmgebieten und den Seitenwänden der zweiten Gräben entsteht. Dadurch werden Prozessschwankungen toleriert.The advantage here is that the short-circuit current-limiting effect arises between the shielding areas and the side walls of the second trenches. This means that process fluctuations are tolerated.
In einer weiteren Ausgestaltung umfasst der Halbleiterkörper SiC oder GaN.In a further embodiment, the semiconductor body comprises SiC or GaN.
In einer Weiterbildung weisen die Abschirmgebiete eine Dotierstoffkonzentration von mindestens 1E18/cm3 auf.In a further development, the shielding regions have a dopant concentration of at least 1E18/cm 3 .
Vorteilhaft ist hierbei, dass hohe Implantationsdosen kostengünstig unterhalb der Grabenböden eingebracht werden können.The advantage here is that high implantation doses can be introduced cost-effectively below the trench bottoms.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die vorliegende Erfindung wird nachfolgend anhand bevorzugter Ausführungsformen und beigefügter Zeichnungen erläutert. Es zeigen:
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1a einen Power-FinFET mit variabler Grabenbreite, -
1b eine Draufsicht auf den Power-FinFET mit variabler Grabenbreite, -
2a einen weiteren Power-FinFET mit variabler Grabenbreite, und -
2b eine Draufsicht auf den weiteren Power-FinFET mit variabler Grabenbreite.
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1a a power FinFET with variable trench width, -
1b a top view of the power FinFET with variable trench width, -
2a another power FinFET with variable trench width, and -
2 B a top view of the additional power FinFET with variable trench width.
In einem Ausführungsbeispiel sind die erste Struktur und die zweite Struktur wellenförmig. Das bedeutet sie weisen innerhalb der Periode eine positive und eine negative Halbwelle auf.In one embodiment, the first structure and the second structure are wave-shaped. This means that they have a positive and a negative half-wave within the period.
In einem weiteren Ausführungsbeispiel sind die erste Struktur und die zweite Struktur rechteckförmig. Alternativ sind die erste Struktur und die zweite Struktur dreieckförmig oder sinusförmig.In a further exemplary embodiment, the first structure and the second structure are rectangular. Alternatively, the first structure and the second structure are triangular or sinusoidal.
Der Halbleiterkörper 101 und 201 umfasst SiC oder GaN.The
Die Abschirmgebiete 112 und 212 weisen eine Dotierstoffkonzentration von mindestens 1E18/cm3 auf.The shielding
Der Power-FinFET 100 und 200 findet Anwendung in DC/DC-Wandlern und Invertern eines elektrischen Antriebststrangs elektischer oder hybrider Fahrzeuge, sowie in Fahrzeugladegeräten.The Power-
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 10224201 B4 [0003]DE 10224201 B4 [0003]
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Citations (8)
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WO2005048352A1 (en) | 2003-11-12 | 2005-05-26 | Toyota Jidosha Kabushiki Kaisha | Trench gate field effect devices |
DE102007048982A1 (en) | 2006-12-27 | 2008-07-03 | Dongbu Hitek Co., Ltd. | Semiconductor component comprises semiconductor substrate with conductivity, and base region of another conductivity in semiconductor substrate |
DE10224201B4 (en) | 2002-05-31 | 2010-11-25 | Infineon Technologies Ag | Semiconductor device with breakdown current path and manufacturing method thereof |
US20140203300A1 (en) | 2011-08-26 | 2014-07-24 | National University Corp Nara Institute Of Science And Technology | SiC SEMICONDUCTOR ELEMENT AND MANUFACTURING METHOD THEREOF |
DE102014114832A1 (en) | 2014-10-13 | 2016-04-14 | Infineon Technologies Austria Ag | Semiconductor device and method of manufacturing a semiconductor device |
DE102015121563A1 (en) | 2015-12-10 | 2017-06-14 | Infineon Technologies Ag | Semiconductor devices and a method of forming a semiconductor device |
US11152503B1 (en) | 2019-11-05 | 2021-10-19 | Semiq Incorporated | Silicon carbide MOSFET with wave-shaped channel regions |
US20220130998A1 (en) | 2020-10-28 | 2022-04-28 | Cree, Inc. | Power semiconductor devices including angled gate trenches |
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2022
- 2022-06-13 DE DE102022205957.3A patent/DE102022205957A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10224201B4 (en) | 2002-05-31 | 2010-11-25 | Infineon Technologies Ag | Semiconductor device with breakdown current path and manufacturing method thereof |
WO2005048352A1 (en) | 2003-11-12 | 2005-05-26 | Toyota Jidosha Kabushiki Kaisha | Trench gate field effect devices |
DE102007048982A1 (en) | 2006-12-27 | 2008-07-03 | Dongbu Hitek Co., Ltd. | Semiconductor component comprises semiconductor substrate with conductivity, and base region of another conductivity in semiconductor substrate |
US20140203300A1 (en) | 2011-08-26 | 2014-07-24 | National University Corp Nara Institute Of Science And Technology | SiC SEMICONDUCTOR ELEMENT AND MANUFACTURING METHOD THEREOF |
DE102014114832A1 (en) | 2014-10-13 | 2016-04-14 | Infineon Technologies Austria Ag | Semiconductor device and method of manufacturing a semiconductor device |
DE102015121563A1 (en) | 2015-12-10 | 2017-06-14 | Infineon Technologies Ag | Semiconductor devices and a method of forming a semiconductor device |
US11152503B1 (en) | 2019-11-05 | 2021-10-19 | Semiq Incorporated | Silicon carbide MOSFET with wave-shaped channel regions |
US20220130998A1 (en) | 2020-10-28 | 2022-04-28 | Cree, Inc. | Power semiconductor devices including angled gate trenches |
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