DE10319515B4 - Trench IGBT - Google Patents
Trench IGBT Download PDFInfo
- Publication number
- DE10319515B4 DE10319515B4 DE2003119515 DE10319515A DE10319515B4 DE 10319515 B4 DE10319515 B4 DE 10319515B4 DE 2003119515 DE2003119515 DE 2003119515 DE 10319515 A DE10319515 A DE 10319515A DE 10319515 B4 DE10319515 B4 DE 10319515B4
- Authority
- DE
- Germany
- Prior art keywords
- trench
- conductivity type
- area
- igbt according
- insulating layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 210000000746 body region Anatomy 0.000 claims abstract description 6
- 238000001465 metallisation Methods 0.000 claims description 16
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910021332 silicide Inorganic materials 0.000 claims description 4
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 238000005468 ion implantation Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 230000036470 plasma concentration Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000002800 charge carrier Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/06—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
- H01L29/10—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 with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1095—Body region, i.e. base region, of DMOS transistors or IGBTs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41741—Source or drain electrodes for field effect devices for vertical or pseudo-vertical devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Trench-IGBT aus wenigstens einer eine Emitterzone (3) eines ersten Leitungstyps, einen Bodybereich (2) eines zweiten, zum ersten Leitungstyp entgegengesetzten Leitungstyps, einen Bereich (1) des ersten Leitungstyps und einen Kollektorbereich (4) aufweisenden Zelle, bei welchem im Wesentlichen in jeder Zelle eine Gateelektrode (9, 10) wenigstens teilweise in einen Trench (6, 7) eingebracht ist und eine Emitterelektrode (12) in einem weiteren Trench (11), der in seinem unteren Gebiet wenigstens teilweise mit einer Isolierschicht (14) versehen ist, die Emitterzone (3) durchsetzt und bis in den Bodybereich (2) hinein reicht, dadurch gekennzeichnet, dass der weitere Trench (11) bis in die Nähe des Bereiches (1) des ersten Leitungstyps reicht und im Bodybereich endet.Trench IGBT at least one of an emitter zone (3) of a first conductivity type, a body region (2) of a second, opposite to the first conductivity type Conductivity type, a region (1) of the first conductivity type and a Collector region (4) having cells, in which substantially in each cell, a gate electrode (9, 10) at least partially in a trench (6, 7) is inserted and an emitter electrode (12) in another trench (11), which in its lower region at least partially provided with an insulating layer (14), the emitter zone (3) interspersed and reaches into the body area (2) into it characterized in that the further trench (11) is close to the area (1) of the first conductivity type and ends in the body area.
Description
Die vorliegende Erfindung betrifft einen Trench-(Graben-)IGBT (Bipolartransistor mit isoliertem Gate) aus wenigstens einer eine Emitterzone eines ersten Leitungstyps, einen Bodybereich eines zweiten, zum ersten Leitungstyp entgegengesetzten Leitungstyps, einen Bereich des ersten Leitungstyps und einen Kollektorbereich aufweisenden Zelle, bei welchem im Wesentlichen in jeder Zelle eine Gateelektrode wenigstens teilweise in einen Trench eingebracht ist und eine Emitterelektrode in einem weiteren Trench, der in seinem unteren Gebiet wenigstens teilweise mit einer Isolierschicht versehen ist, die Emitterzone durchsetzt und bis in den Bodybereich hineinreicht.The The present invention relates to a trench (trench) IGBT (bipolar transistor insulated gate) of at least one emitter zone of one first conductivity type, a body region of a second, the first Line type of opposite conductivity type, one area of the first Type of line and a collector region having cell, in which essentially a gate electrode at least partially in each cell is introduced into a trench and an emitter electrode in one another trench, at least partially in its lower part is provided with an insulating layer, passes through the emitter zone and reaches into the body area.
In
der
In
der
Weiterhin
ist aus der
Damit soll ein Einschalten eines parasitären Bipolartransistors weitgehend vermieden werden.In order to should a switching on a parasitic bipolar transistor largely be avoided.
Schließlich ist
aus der
Sourceelektrode kontaktiert. Zur Erhöhung der Durchbruchsfestigkeit sind im Halbleiterkörper zwischen den unteren Enden der Trenches der einzelnen Zellen Isolierschichten vergraben.source electrode contacted. To increase the Breakthrough resistance is in the semiconductor body between the lower ends the trenches of individual cells buried insulating layers.
Für gute Eigenschaften und insbesondere eine hohe Durchbruchsfestigkeit ist es bei Trench-IGBTs von Bedeutung, dass im gesamten Drainbereich eine möglichst konstante Ladungsträger- bzw. Plasmakonzentration vorliegt. Um diese zu erhalten, sollten bei einem n-leitenden Halbleiterkörper in diesen der Elektronen-Einlass und der Löcher-Auslass möglichst in einem engen Querschnitt erfolgen.For good properties and in particular a high breakdown strength is in trench IGBTs important that in the entire drain area as possible constant charge carrier or plasma concentration is present. To get these, should in an n-type semiconductor body in these the electron inlet and the hole outlet preferably done in a narrow cross-section.
Es hat sich auch gezeigt, dass eine große Kurzschlussfestigkeit bei einem Trench-IGBT dann erreicht werden kann, wenn das Kontaktloch für die Sourceelektrode bis tief in den Bodybereich hineinreicht. Dies bewirkt nämlich, dass dann die Löcher schnell in der Kontakt-Metallschicht der Emitterelektrode verschwinden und so ein relativ langer MOSFET mit guter Steuerbarkeit vorliegt, wodurch das Kurzschlussverhalten drastisch verbessert wird.It has also been shown to provide great short circuit strength a trench IGBT can then be achieved when the contact hole for the source electrode reaches deep into the body area. This causes that then the holes fast disappear in the contact metal layer of the emitter electrode and such a relatively long MOSFET is present with good controllability, which the short-circuit behavior is drastically improved.
Es ist nun Aufgabe der vorliegenden Erfindung, einen Trench-IGBT zu schaffen, der sich durch eine große Kurzschlussfestigkeit auszeichnet.It It is an object of the present invention to provide a trench IGBT, which is characterized by a large Short circuit strength distinguishes.
Diese Aufgabe wird bei einem Trench-IGBT der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass der weitere Trench bis in die Nähe des Bereiches des ersten Leitungstyps reicht und im Bodybereich endet.These Task is in a trench IGBT of the type mentioned in the present invention solved, that the further trench up to near the area of the first Type of line is sufficient and ends in the body area.
Dabei reicht der weitere Trench bis weit in den Bodybereich hinein und durchsetzt diesen nahezu, um kurz vor dem pn-Übergang zwischen dem Bodybereich und dem Bereich des ersten Leitungstyps zu enden. Der weitere Trench bildet so für die Sourceelektrode ein tiefes Kontaktloch, welches einen "Isolatorboden" hat. Dieser Isolatorboden bewirkt, dass die Ladungsträger- bzw. Plasmakonzentration an dem pn-Übergang zwischen dem Bodybereich und dem Bereich des einen Leitungstyps, also vorzugsweise an der Grenze der epitaktischen Schichten, homogen und hoch ist.there the further trench reaches far into the body area and almost penetrates this, just before the pn junction between the body area and the area of the first conductivity type to end. The further trench thus forms a deep one for the source electrode Contact hole having an "insulator floor". This insulator floor causes the charge carrier or plasma concentration at the pn junction between the body area and the region of the one conductivity type, that is preferably at the Limit of epitaxial layers, is homogeneous and high.
Die durch einen MOSFET gebildete Steuerstrecke des IGBTs hat so einen langen Kanal, so dass die Löcher schnell hinter dem Isolatorboden im Metall der Sourceelektrode verschwinden können.The a control path of the IGBT formed by a MOSFET has such a long channel, leaving the holes quickly disappear behind the insulator floor in the metal of the source electrode can.
Nachfolgend wird die Erfindung anhand der Zeichnungen näher erläutert. Es zeigen:following The invention will be explained in more detail with reference to the drawings. Show it:
In den Figuren werden für einander entsprechende Teile jeweils die gleichen Bezugszeichen verwendet. Außerdem sei angemerkt, dass die angegebenen Leitfähigkeitstypen auch umgekehrt sein können. Das heißt, anstelle von p-Leitfähigkeit kann n-Leitfähigkeit und anstelle von n-Leitfähigkeit kann p-Leitfähigkeit gegeben sein. Als Halbleitermaterial sind Silizium, Siliziumcarbid, Verbindungshalbleiter usw. geeignet.In the figures are entspre for each other the same parts are used. It should also be noted that the indicated conductivity types can also be reversed. That is, n-type conductivity may be used instead of p-type conductivity, and p-type conductivity may be given instead of n-type conductivity. As a semiconductor material, silicon, silicon carbide, compound semiconductors, etc. are suitable.
In
Durch
die Schichten
Im
Bereich zwischen den beiden Trenches
Auf
der der Metallisierung
Der
Boden des Trenches
Bei
angelegten Spannungen +UG bzw. +UD bzw. Bezugspotential an die Füllungen
Das
Ausführungsbeispiel
von
Gegebenenfalls
kann noch eine p+-dotierte Zone
Die
Ausführungsbeispiele
der
Die
Isolierschicht
- 11
- HalbleiterkörperSemiconductor body
- 22
- BodybereichBody area
- 33
- Emitterzoneemitter region
- 44
- p+-leitende Schichtp + -conducting layer
- 55
- n-leitende Schichtn-type layer
- 66
- Trenchtrench
- 77
- Trenchtrench
- 88th
- Isolierschichtinsulating
- 99
- Trench-FüllungTrench filling
- 1010
- Trench-FüllungTrench filling
- 1111
- weiterer TrenchAnother trench
- 1212
- Metallisierungmetallization
- 1313
- Drain-MetallisierungDrain metallization
- 1414
- Isolierschichtinsulating
- 1515
- Trench-FüllungTrench filling
- 1616
- Silizidschichtsilicide
- 1717
- Metallisierungmetallization
- 1818
- p+-leitende Zonep + -type zone
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003119515 DE10319515B4 (en) | 2003-04-30 | 2003-04-30 | Trench IGBT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003119515 DE10319515B4 (en) | 2003-04-30 | 2003-04-30 | Trench IGBT |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10319515A1 DE10319515A1 (en) | 2004-11-25 |
DE10319515B4 true DE10319515B4 (en) | 2005-06-23 |
Family
ID=33394021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2003119515 Expired - Fee Related DE10319515B4 (en) | 2003-04-30 | 2003-04-30 | Trench IGBT |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10319515B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007029121B3 (en) * | 2007-06-25 | 2008-11-20 | Infineon Technologies Austria Ag | Method for producing a semiconductor component, and semiconductor component |
DE102014113557B4 (en) * | 2014-09-19 | 2020-06-10 | Infineon Technologies Ag | SEMICONDUCTOR DEVICE WITH VARIABLE RESISTIVE ELEMENT |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5623152A (en) * | 1995-02-09 | 1997-04-22 | Mitsubishi Denki Kabushiki Kaisha | Insulated gate semiconductor device |
DE4435458C2 (en) * | 1994-10-04 | 1998-07-02 | Siemens Ag | Semiconductor component controllable by field effect |
US5894149A (en) * | 1996-04-11 | 1999-04-13 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device having high breakdown voltage and method of manufacturing the same |
EP1089343A2 (en) * | 1999-09-30 | 2001-04-04 | Kabushiki Kaisha Toshiba | Semiconductor device with trench gate |
-
2003
- 2003-04-30 DE DE2003119515 patent/DE10319515B4/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4435458C2 (en) * | 1994-10-04 | 1998-07-02 | Siemens Ag | Semiconductor component controllable by field effect |
US5623152A (en) * | 1995-02-09 | 1997-04-22 | Mitsubishi Denki Kabushiki Kaisha | Insulated gate semiconductor device |
US5894149A (en) * | 1996-04-11 | 1999-04-13 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device having high breakdown voltage and method of manufacturing the same |
EP1089343A2 (en) * | 1999-09-30 | 2001-04-04 | Kabushiki Kaisha Toshiba | Semiconductor device with trench gate |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007029121B3 (en) * | 2007-06-25 | 2008-11-20 | Infineon Technologies Austria Ag | Method for producing a semiconductor component, and semiconductor component |
US8304305B2 (en) | 2007-06-25 | 2012-11-06 | Infineon Technologies Austria Ag | Semiconductor component |
DE102014113557B4 (en) * | 2014-09-19 | 2020-06-10 | Infineon Technologies Ag | SEMICONDUCTOR DEVICE WITH VARIABLE RESISTIVE ELEMENT |
Also Published As
Publication number | Publication date |
---|---|
DE10319515A1 (en) | 2004-11-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8364 | No opposition during term of opposition | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |