DE102004047073B3 - Production of edge passivation on silicon carbide-based semiconductors uses amorphous, semi-insulating layer of material with larger bandgap than silicon carbide - Google Patents
Production of edge passivation on silicon carbide-based semiconductors uses amorphous, semi-insulating layer of material with larger bandgap than silicon carbide Download PDFInfo
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- DE102004047073B3 DE102004047073B3 DE200410047073 DE102004047073A DE102004047073B3 DE 102004047073 B3 DE102004047073 B3 DE 102004047073B3 DE 200410047073 DE200410047073 DE 200410047073 DE 102004047073 A DE102004047073 A DE 102004047073A DE 102004047073 B3 DE102004047073 B3 DE 102004047073B3
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 42
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000002161 passivation Methods 0.000 title claims abstract description 15
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims description 7
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 42
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- 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
- H01L29/0603—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
- 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]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- 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
- H01L29/1608—Silicon carbide
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung einer Randpassivierung bei einem Halbleiterbauelement gemäß dem Oberbegriff des Patentanspruches 1. Daneben bezieht sich die Erfindung auch auf das zugehörige Halbleiterbauelement.The The invention relates to a method for producing edge passivation in a semiconductor device according to the preamble of claim 1. In addition, the invention also relates to the associated semiconductor device.
Die elektrische Abschirmung von elektrischen Siliziumkarbid(SiC)-Bauelementen gegenüber äußeren Ladungen und Feldern ist eine wesentliche prozesstechnische Maßnahme, um ein stabiles Langzeitverhalten des Bauelementes zu garantieren. Da im aktiven Bereich des SiC-Bauelementes eine etwa 10fach höhere elektrische Feldstärke als in Silizium(Si)-Bauelementen auftritt, müssen die internen elektrischen Felder durch geeignete Randstrukturen im aktiven Halbleiterbereich und insbesondere an der Oberfläche vergleichsweise stärker reduziert werden als bei Si-Bauelementen.The electrical shielding of silicon carbide (SiC) electrical components towards external charges and fields is an essential procedural measure, to guarantee a stable long-term behavior of the component. There in the active region of the SiC component, an approximately 10 times higher electrical field strength As occurs in silicon (Si) devices, the internal electrical Fields by suitable edge structures in the active semiconductor region and especially on the surface comparatively stronger be reduced than Si components.
Letzteres
ist im Einzelnen beispielsweise in der
Üblicherweise werden als Passivierungsschichten anorganische Schichten – wie Oxide, Nitride – oder aber organische Schichten – wie Polyimide, Silikonkautschuke o. dgl. – verwendet. Solche Materialien bilden jeweils isolierende, dielektrische Deckschichten auf den Bauelementen.Usually are passivation layers inorganic layers - such as oxides, Nitrides - or but organic layers - like Polyimides, silicone rubbers or the like - used. Such materials each form insulating, dielectric cover layers on the Components.
Es sind auch alternative Vorschläge – beispielsweise so genannte SIPOS(= Semiisolierende Polysilizium)-Schichten – bekannt, wie durch Herstellung einer spezifischen Widerstands schicht eine gezielte Potentialverteilung auf der Oberfläche des Halbleiterbauelementes stabil einzustellen ist. Dies wird durch hochohmige, so genannte semiisolierende Schichten entweder direkt auf dem Halbleiter oder auf einer isolierenden Schicht wie SiO2, erreicht. Derartige semiisolierende Schichten sind meist Polysilizium oder Polysiliziumcarbid.There are also alternative proposals - for example, so-called SIPOS (= semi-insulating polysilicon) layers - known how to establish a specific potential distribution on the surface of the semiconductor device stable by producing a resistivity layer. This is achieved by high-resistance, so-called semi-insulating layers either directly on the semiconductor or on an insulating layer such as SiO 2 . Such semi-insulating layers are usually polysilicon or polysilicon carbide.
Der Nachteil letzterer Schichten speziell für schnellschaltende SiC-Bauelemente liegt neben einem erhöhten Leckstrom über dem Widerstand vor allem in der RC-Zeitkonstante, die durch das Aufladen der Widerstandsschicht zur Einstellung des Potentials definiert ist.Of the Disadvantage of the latter layers especially for fast-switching SiC components is next to an elevated one Leakage over especially in the RC time constant caused by the Charging the resistive layer defines the potential setting is.
Aus
der
Aufgabe der Erfindung ist es demgegenüber, eine für Siliziumkarbid(SiC)-Bauelemente spezifische elektroaktive Passivierung vorzuschlagen, die eine vollständige Abschirmung gegenüber äußeren Störladungen sichert. Dazu soll ein verbessertes Verfahren zur Herstellung einer Randpassivierung bei einem Halbleiterbauelement angegeben werden, durch welches das Schaltverhalten des Bauelementes nicht beeinträchtigt wird. Mit diesem Herstellungsverfahren soll somit ein verbessertes, stabiles Halbleiterbauelement geschaffen werden.task the invention it is in contrast, a for silicon carbide (SiC) devices to propose specific electroactive passivation, providing a complete shielding against external disturbance charges guaranteed. For this purpose, an improved method for producing a Randpassivierung be given in a semiconductor device, by which does not affect the switching behavior of the device. An improved, stable semiconductor component is thus intended with this production method be created.
Die Aufgabe ist bei einem Herstellungsverfahren der eingangs genannten Art durch die Gesamtheit der im Patentanspruch 1 angegebenen Maßnahmen gelöst. Ein zugehöriges Halbleiterbau element ist Gegenstand des Patentanspruches 8. Weiterbildungen des Verfahrens und der zugehörigen Bauelemente sind Gegenstand der Unteransprüche.The Task is in a manufacturing method of the aforementioned Art by the totality of the measures specified in claim 1 solved. An associated Semiconductor component is the subject of claim 8. Further developments of the method and the associated components are the subject of the dependent claims.
Die Erfindung besteht in einer solchen Aufbringung einer amorphen, semiisolierenden SiC-Schicht auf das Randgebiet bei einem SiC-Bauelement, dass eine lokale feste Ankopplung an das Potential im unter der Schicht liegenden Halbleitergebiet gewährleistet ist. Dies wird durch eine (Quasi-)Bandstruktur in der semiisolierenden Schicht erreicht, die erstens einen Bandabstand größer als der des kristallinen SiC-Halbleiters und zweitens eine hohe Dichte stark lokalisierter Zustände aufweist, so dass eine Heterostruktur – gebildet aus semiisolierender Schicht und SiC-Halbleitergebiet – eine lokale Diodencharakteristik zeigt.The The invention consists in such an application of an amorphous semi-insulating SiC layer on the outskirts at a SiC device that is a local solid Coupling to the potential in the underlying semiconductor region under the layer guaranteed is. This is due to a (quasi-) band structure in the semi-insulating Layer reaches, first, a band gap greater than that of the crystalline SiC semiconductor and secondly a high density strongly localized states has, so that a heterostructure - formed of semi-insulating Layer and SiC semiconductor region - a local diode characteristic shows.
Durch die erfindungsgemäße Verfahrensweise wird das Potential des Halbleiters nahezu ungestört in die semiisolierende Schicht übertragen und nur mit einem kleinen Sprung durch die Schwellspannung dieser Diodecharakteristik bestimmt.By the procedure of the invention the potential of the semiconductor is transferred almost undisturbed into the semi-insulating layer and only with a small jump through the threshold voltage of this Diode characteristic determined.
Bei einem erfindungsgemäß ausgebildeten Bauelement erfolgt aufgrund des größeren Bandabstandes in der amorphen Schicht vorteilhafterweise der Potentialsprung nahezu symmetrisch auf p- und n-Gebieten des Halbleiterbauelementes. Der Potentialsprung wird durch die Schwellspannung der sog. Hetero-Diode definiert. Damit bleiben Potentiale an der Grenze der Heterostruktur, d.h. am sog. Interface, nahe der Flachbandbedingung. Ein zusätzlicher Sperrstrom zum Aufladen der Schicht wird nicht benötigt. Somit ergeben sich bei erfindungsgemäß ausgebildeten Halbleiterbauelementen vorteilhafterweise keine RC-Zeitkonstanten und keine Beeinträchtigung bei schnellen Schaltvorgängen.In a device designed according to the invention, due to the larger band gap in the amorphous layer, the potential jump advantageously takes place almost symmetrically on p and n regions of the semiconductor component. The potential jump is defined by the threshold voltage of the so-called hetero-diode. This leaves potentials at the boundary of the heterostructure, ie at the so-called interface, near the flat-band condition. An additional one Reverse current to charge the layer is not needed. Thus, in semiconductor devices designed according to the invention, advantageously no RC time constants and no impairment in fast switching operations result.
Bei der Erfindung ist die semiisolierende Schicht durch eine hohe Konzentration an lokalisierten "Trap"-Zuständen, deren Ladungstransport vorzugsweise durch die so genannte "Hopping"-Leitfähigkeit über die lokalisierten Zustände erfolgt, definiert. Diese lokalisierten Zustände, deren Zustandsdichte typischerweise wesentlich größer als 1018/cm3 ist, gewährleisten die vollständige elektrische Abschirmung des aktiven Halbleitervolumens gegen äußere Ladungen und Felder.In the invention, the semi-insulating layer is defined by a high concentration of localized "trap" states whose charge transport is preferably via the so-called "hopping" conductivity over the localized states. These localized states, whose density of states is typically significantly greater than 10 18 / cm 3 , ensure complete electrical shielding of the active semiconductor volume from external charges and fields.
Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Figurenbeschreibung von Ausführungsbeispielen anhand der Zeichnung in Verbindung mit den Patentansprüchen.Further Advantages and details of the invention will become apparent from the following Description of the figures of exemplary embodiments with reference to the drawing in conjunction with the claims.
Es zeigenIt demonstrate
Es werden zunächst die gemeinsamen Strukturen der Figuren und anschließend die spezifischen Unterschiede beschrieben. Gleiche Elemente sind dabei mit gleichen Bezugszeichen versehen.It be first the common structures of the figures and then the described specific differences. Same elements are included provided with the same reference numerals.
In
den
In
den
In
In
Statt
der Widerstandsschicht
Beim
Aufbau gemäß den
In
Bei
den neuen Anordnungen ist die amorphe Schicht
Andere Schichten aus amorphen, halbleitendem Materialien – wie Galliumnitrid (GaN), Aluminiumnitrid (AlN) oder Zinkoxid (ZnO) – sind ebenfalls möglich, sofern die drei grundsätzlichen Eigenschaften einer hohen "Trap"-Zustandsdichte, eines größeren Bandabstandes und die Prozesskompatibilität mit der Siliciumcarbid-Technik gewährleistet sind.Other Layers of amorphous, semiconducting materials - such as gallium nitride (GaN), aluminum nitride (AlN) or zinc oxide (ZnO) - are also possible, provided that the three fundamental ones Properties of a high "trap" state density, a larger band gap and the process compatibility guaranteed by the silicon carbide technique.
Bei den neuen Anordnungen sollte die Dicke der Schicht 50 nm nicht unterschreiten. Vorteilhaft ist eine Schichtdicke von etwa 100 nm, beispielsweise bis zu 200 nm. Es sind aber auch dickere Schichten möglich.With the new arrangements should the thickness the layer does not fall below 50 nm. A layer thickness of about 100 nm, for example up to 200 nm, is advantageous. However, thicker layers are also possible.
Über die neuen semiisolierenden Schichten können weitere, d.h. dickere dielektrische Schichten zum mechanischen oder chemischen Schutz angebracht sein. Damit ist eine Vermeidung dielektrischer Überschläge möglich, so dass deren Eigenschaften, beispielsweise mobile Ladungen, den darunter liegenden Halbleiter nicht mehr stören können.About the new semi-insulating layers may be further, i. thicker dielectric layers for mechanical or chemical protection to be appropriate. In order to avoid dielectric flashovers is possible, so that their properties, such as mobile charges, the underneath lying semiconductor can no longer bother.
Aufgrund der physikalischen Eigenschaften der Schicht ergeben sich wesentliche Verbesserungen. Es ist eine vollständige elektrische Abschirmung des Halbleiters gegenüber störenden äußeren elektrischen Einflüssen, die die Langzeitstabilität des elektrischen Bauelementes garantiert, erreicht. Der Herstellprozess ist einfach.by virtue of The physical properties of the layer are essential Improvements. It is a complete electrical shielding of the Semiconductor opposite disturbing external electrical influences, the long-term stability guaranteed of the electrical component achieved. The manufacturing process is simple.
Bei
der neuen Anordnung gemäß den
Insgesamt wird für die Randpassivierung nunmehr eine amorphe Schicht aus einem Material mit großem Bandabstand verwendet. Damit ergibt sich ein Bauelement mit einer so genannten JTE-Schicht aus einem Material, das ein sog. Quasi-Gap ermöglicht und breiter ist als das Gap von kristallinem Siliziumcarbid.All in all is for the edge passivation now an amorphous layer of a material with great Band gap used. This results in a device with a so-called JTE layer from a material that allows a so-called quasi-gap and is wider than the gap of crystalline silicon carbide.
Claims (12)
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2017076659A1 (en) * | 2015-11-05 | 2017-05-11 | Abb Schweiz Ag | Power semiconductor device and method for producing a power semiconductor device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5712502A (en) * | 1994-07-27 | 1998-01-27 | Siemens Aktiengesellschaft | Semiconductor component having an edge termination means with high field blocking capability |
DE19837944A1 (en) * | 1998-08-21 | 2000-02-24 | Asea Brown Boveri | Method of manufacturing a semiconductor device |
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- 2004-09-28 DE DE200410047073 patent/DE102004047073B3/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US5712502A (en) * | 1994-07-27 | 1998-01-27 | Siemens Aktiengesellschaft | Semiconductor component having an edge termination means with high field blocking capability |
DE19837944A1 (en) * | 1998-08-21 | 2000-02-24 | Asea Brown Boveri | Method of manufacturing a semiconductor device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017076659A1 (en) * | 2015-11-05 | 2017-05-11 | Abb Schweiz Ag | Power semiconductor device and method for producing a power semiconductor device |
GB2558147A (en) * | 2015-11-05 | 2018-07-04 | Abb Schweiz Ag | Power semiconductor device and method for producing a power semiconductor device |
US10546795B2 (en) | 2015-11-05 | 2020-01-28 | Abb Schweiz Ag | Power semiconductor device and method for producing a power semiconductor device |
GB2558147B (en) * | 2015-11-05 | 2020-11-11 | Abb Schweiz Ag | Power semiconductor device and method for producing a power semiconductor device |
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