DE102006055742A1 - Semiconductor component arrangement, has control electrodes controlled in operating condition in which transistor is blocked such that potentials of control electrodes gradually provide potential gradient in drift zone - Google Patents
Semiconductor component arrangement, has control electrodes controlled in operating condition in which transistor is blocked such that potentials of control electrodes gradually provide potential gradient in drift zone Download PDFInfo
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- DE102006055742A1 DE102006055742A1 DE200610055742 DE102006055742A DE102006055742A1 DE 102006055742 A1 DE102006055742 A1 DE 102006055742A1 DE 200610055742 DE200610055742 DE 200610055742 DE 102006055742 A DE102006055742 A DE 102006055742A DE 102006055742 A1 DE102006055742 A1 DE 102006055742A1
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- drift zone
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 125
- 230000000903 blocking effect Effects 0.000 claims description 20
- 230000000295 complement effect Effects 0.000 claims description 10
- 239000012530 fluid Substances 0.000 abstract 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000009825 accumulation Methods 0.000 description 18
- 239000000758 substrate Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002800 charge carrier Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000001994 activation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H—ELECTRICITY
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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
- H01L29/66—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
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- 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
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- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
- H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
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- 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]
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- H01L29/7817—Lateral DMOS transistors, i.e. LDMOS transistors structurally associated with at least one other device
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Abstract
Description
Die Erfindung betrifft eine Halbleiterbauelementanordnung, insbesondere eine Leistungshalbleiterbauelementanordnung.The The invention relates to a semiconductor device arrangement, in particular a power semiconductor device arrangement.
Ein Ziel bei der Entwicklung von Leistungshalbleiterbauelementen besteht darin, Bauelemente mit möglichst hoher Sperrspannung herzustellen, die dennoch einen niedrigen Einschaltwiderstand haben und die gleichzeitig möglichst geringe Schaltverluste aufweisen.One Goal in the development of power semiconductor devices consists in it, components with as possible produce high reverse voltage, yet a low on-resistance have and at the same time as possible have low switching losses.
Eine
Möglichkeit,
den Einschaltwiderstand eines Leistungshalbleiterbauelements bei
einer gegebenen Sperrfähigkeit
zu reduzieren, ist die Verwendung des Kompensationsprinzips, das
beispielsweise in
Eine
weitere Möglichkeit
zur Reduzierung des Einschaltwiderstandes eines Halbleiterbauelements
besteht im Vorsehen einer gegenüber
der Driftzone dielektrisch isolierten Feldelektrode. Derartige Bauelemente
sind in
Die Aufgabe der vorliegenden Erfindung besteht darin, eine Halbleiterbauelementanordnung mit einem MOS-Transistor, der einen niedrigen Einschaltwiderstand bei gleichzeitig hoher Sperrspannung aufweist, zur Verfügung zu stellen.The The object of the present invention is a semiconductor device arrangement with a MOS transistor, which has a low on-resistance at the same time having high reverse voltage available put.
Diese Aufgabe wird durch eine Halbleiterbauelementanordnung gemäß Patentanspruch 1 gelöst. Unterschiedliche Ausführungsformen und Weiterentwicklungen sind Gegenstand der Unteransprüche.These The object is achieved by a semiconductor device arrangement according to claim 1 solved. Different embodiments and further developments are the subject of the dependent claims.
Die erfindungsgemäße Halbleiterbauelementanordnung umfasst einen Halbleiterkörper und einen MOS-Transistor, der eine in dem Halbleiterkörper angeordnete Sourcezone eines ersten Leitungstyps, eine an die Sourcezone angrenzende Bodyzone eines zweiten Leitungstyps, eine in dem Halbleiterkörper angeordnete Drainzone, eine zwischen der Drainzone und der Bodyzone angeordnete Driftzone und eine Gateelektrode aufweist, die benachbart zu der Bodyzone angeordnet und von dieser durch ein erstes Dielektrikum getrennt ist. Des Weiteren umfasst die Halbleiterbauelementanordnung mindestens zwei Steuerelektroden, die benachbart zu der Driftzone entlang einer Oberfläche des Halbleiterkörpers angeordnet und von dieser durch ein zweites Dielektrikum getrennt sind.The inventive semiconductor device arrangement comprises a semiconductor body and a MOS transistor having one disposed in the semiconductor body Source zone of a first conductivity type, one adjacent to the source zone Bodyzone of a second conductivity type, one arranged in the semiconductor body Drain zone, a drift zone located between the drain zone and the body zone and a gate electrode adjacent to the body zone arranged and separated from this by a first dielectric is. Furthermore, the semiconductor device arrangement comprises at least two control electrodes adjacent to the drift zone along a surface of the semiconductor body arranged and separated from this by a second dielectric are.
Die Bauelementanordnung umfasst außerdem eine Ansteuerschaltung, die an die Gateelektrode, die Steuerelektroden und die Drainzone angeschlossen ist und die dazu ausgebildet ist, in einem ersten Betriebszustand, in dem der MOS-Transistor leitet, die wenigstens zwei Steuerelektroden derart anzusteuern, dass sich ein leitender Kanal entlang des zweiten Dielektrikums in der Driftzone ausbildet, und in einem zweiten Betriebszustand, in dem der MOS-Transistor sperrt, die Steuerelektroden derart anzusteuern, dass Potentiale der Steuerelektroden stufenweise dem Potentialverlauf in der Driftzone folgen.The Component arrangement also includes a drive circuit connected to the gate electrode, the control electrodes and the drain is connected and that is designed to in a first operating state in which the MOS transistor conducts, to control the at least two control electrodes such that a conductive channel along the second dielectric in the drift zone forms, and in a second operating state in which the MOS transistor blocks the control electrodes in such a way that potentials the control electrodes stepwise the potential profile in the drift zone consequences.
Die Ausbildung eines leitenden Kanals in der Driftzone gesteuert durch die benachbart zu der Driftzone angeordneten Steuerelektroden dient zur Reduktion des Einschaltwiderstandes im Vergleich zu MOS-Transistoren ohne solche Steuerelektroden. Die Anpassung der elektrischen Potentiale der Steuerelektroden im Sperrfall an das elektrische Potential in der Driftzone reduziert die Spannungsbelastung des zweiten Dielektrikums und ermöglicht damit, eine dünne Dielektrikumsschicht als zweites Dielektrikum vorzusehen, was wiederum im leitenden Zustand die Ausbildung des leitenden Kanals begüns tigt. Der leitende Kanal ist hierbei ein Akkumulationskanal, wenn die Driftzone vom gleichen Leitungstyp wie die Sourcezone ist und ein Inversionskanal, wenn die Driftzone komplementär zu der Sourcezone dotiert ist.The Formation of a conductive channel in the drift zone controlled by the control electrodes arranged adjacent to the drift zone serve to reduce the on-resistance in comparison to MOS transistors without such control electrodes. The adaptation of the electrical potentials the control electrodes in the case of blocking to the electrical potential in The drift zone reduces the stress load on the second dielectric and allows with it, a thin one Dielectric layer to provide as a second dielectric, which in turn in the conducting state, the formation of the conductive channel is favored. The conducting channel here is an accumulation channel, if the Drift zone of the same conductivity type as the source zone is and a Inversion channel when the drift zone doped complementary to the source zone is.
Bei sperrendem MOS-Transistor wird eine zwischen der Drainzone und der Sourcezone anliegende Sperrspannung hauptsächlich von der Driftzone aufgenommen, in der sich eine Raumladungszone ausbreitet. Ein elektrisches Potential in der Driftzone nimmt hierbei ausgehend von der Bodyzone in Richtung der Drainzone – je nach Leitungstyp der Driftzone – linear zu oder linear ab, sofern die Driftzone sehr niedrig dotiert ist.at blocking MOS transistor, one between the drain zone and the Sourcezone adjacent reverse voltage mainly absorbed by the drift zone, in which a space charge zone spreads. An electrical potential in the drift zone this starts in the direction of the body zone the drain zone - ever according to conductivity type of the drift zone - linear to or from linear if the drift zone is doped very low.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand von Figuren näher erläutert. Die Figuren dienen lediglich dazu, Ausführungsbeispiele der Erfindung zu erläutern, die in den Figuren dargestellten Strukturen sind daher nicht notwendigerweise maßstabsgerecht und nicht notwendigerweise skalierbar.embodiments The invention will be explained in more detail with reference to figures. The figures serve only to embodiments of the To explain the invention the structures shown in the figures are therefore not necessarily to scale and not necessarily scalable.
In den Figuren bezeichnen, sofern nicht anders angegeben, gleiche Bezugszeichen gleiche Komponenten mit gleicher Bedeutung.In denote the figures, unless otherwise indicated, like reference numerals same components with the same meaning.
Die
Bauelementanordnung umfasst außerdem
einen MOS-Transistor mit einer in dem Halbleiterkörper
Die
Sourcezone
Der
in
Die
Halbleiterbauelementanordnung umfasst weiterhin wenigstens zwei
Steuerelektroden
Zur
Ansteuerung der Steuerelektroden
Die
dargestellte Halbleiterbauelementanordnung kann zwei unterschiedliche
Betriebszustände annehmen,
einen ersten Betriebszustand, bei dem der MOS-Transistor leitend
angesteuert ist, und einen zweiten Betriebszustand, bei dem der MOS-Transistor sperrend
angesteuert ist. Der MOS-Transistor leitet bei anliegender Spannung
zwischen dem Source- und Drainanschluss, wenn an dessen Gateelektrode
Die
Spannungsfestigkeit des dargestellten Bauelements ist von der Dotierungskonzentration
in der Driftzone
Die
Ansteuerschaltung
Die
Ladungsträgerdichte
in einem sich in der Driftzone
Die
Dotierstoffladung in der Driftzone
Die
Ansteuerpotentiale der Steuerelektroden
Bei
gesperrtem MOS-Transistor und sich in der Driftzone ausbreitender
Raumladungszone steigt das elektrische Potential in der Driftzone
In
Die
Potentiale U91, ..., U9n der Steuerelektroden
Durch
die geringere Spannungsbelastung kann die Dicke des Dielektrikums
Die
Bei
dem in
Im
ersten Betriebszustand, in dem der MOS-Transistor leitend angesteuert
ist, ist – für den dargestellten
Fall eines n-Kanal
MOS-Transistors – das
Potential der Gateelektrode
Der
Akkumulationskanal bildet sich hierbei erst dann aus, wenn bereits
ein Inversionskanal in der Bodyzone
Im
zweiten Betriebszustand, in dem der MOS-Transistor sperrend angesteuert
ist, ist – für den dargestellten
Fall eines n-Kanal MOS-Transistors – das Potential der Drainzone
Bei
Verwendung von Dioden, die ein wenigstens annähernd identisches Kennlinienverhalten
besitzen, verteilt sich diese Spannung gleichmäßig auf die Dioden D1, ...,
Dn, d.h. über
den Dioden liegt jeweils ein gleicher Anteil der gesamten Span nung
an. Dieser Anteil beträgt
jeweils Udg/n, wobei Udg die Drain-Gate-Spannung und n die Anzahl
der Dioden D1, ..., Dn der Diodenkette bezeichnet. Die über den Dioden
anliegenden Spannung entspricht hierbei der Differenz der elektrischen
Potentiale zweier benachbarter Steuerelektroden bzw. der "Stufenhöhe". Die elektrischen
Potentiale der Steuerelektroden nehmen hierbei ausgehend von der
der Gateelektrode
Die
Anzahl der Steuerelektroden
Die
Dioden D1, D2, ..., Dn der Diodenkette und die weitere Diode D,
die in
Die
Struktur der in
In
der Halbleiterzone
Zwischen
der Anschlusszone
Bei
leitend angesteuertem MOS-Transistor liegt die Halbleiterzone
Bei
sperrend angesteuertem MOS-Transistor ist das Drainpotential D in
erläuterter
Weise höher als
das Gatepotential G. Das elektrische Potential in der Driftzone
nimmt hierbei ausgehend von der zweiten Anschlusszone in Richtung
der ersten Anschlusszone zu. Die Halbleiterzone
Die
Funktionsweise des Bauelements mit in Gräben angeordneten Gate- und
Steuerelektroden
Auch Kombinationen der zuvor erläuterten räumlichen Positionen der Gateelektrode und der Steuerelektroden sind anwendbar. So kann beispielsweise die Gateelektrode oberhalb des Halbleiterkörpers und die Steuerelektroden können in einem Graben angeordnet werden, und umgekehrt.Also Combinations of the previously explained spatial Positions of the gate electrode and the control electrodes are applicable. For example, the gate electrode above the semiconductor body and the control electrodes can be arranged in a trench, and vice versa.
Die
Die
in
Bei
dem in
Die
anhand der
Claims (17)
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US7880224B2 (en) | 2008-01-25 | 2011-02-01 | Infineon Technologies Austria Ag | Semiconductor component having discontinuous drift zone control dielectric arranged between drift zone and drift control zone and a method of making the same |
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