DE2642721A1 - Semiconductor diode for high current density - has metal layers of good thermal conductivity and sufficient thickness between semiconductor surface and contact - Google Patents
Semiconductor diode for high current density - has metal layers of good thermal conductivity and sufficient thickness between semiconductor surface and contactInfo
- Publication number
- DE2642721A1 DE2642721A1 DE19762642721 DE2642721A DE2642721A1 DE 2642721 A1 DE2642721 A1 DE 2642721A1 DE 19762642721 DE19762642721 DE 19762642721 DE 2642721 A DE2642721 A DE 2642721A DE 2642721 A1 DE2642721 A1 DE 2642721A1
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- semiconductor component
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- diode
- semiconductor
- metal layer
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052709 silver Inorganic materials 0.000 claims abstract description 6
- 239000004332 silver Substances 0.000 claims abstract description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052737 gold Inorganic materials 0.000 claims abstract description 4
- 239000010931 gold Substances 0.000 claims abstract description 4
- 238000005476 soldering Methods 0.000 claims abstract description 3
- 229910000679 solder Inorganic materials 0.000 claims description 13
- 238000001465 metallisation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 2
- 238000005530 etching Methods 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- -1 silver ions Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/71—Means for bonding not being attached to, or not being formed on, the surface to be connected
- H01L24/72—Detachable connecting means consisting of mechanical auxiliary parts connecting the device, e.g. pressure contacts using springs or clips
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- 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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
- H01L29/456—Ohmic electrodes on silicon
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01013—Aluminum [Al]
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1203—Rectifying Diode
- H01L2924/12032—Schottky diode
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1203—Rectifying Diode
- H01L2924/12036—PN diode
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- Manufacturing & Machinery (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
Description
HalbleiterbauelementSemiconductor component
Die Erfindung betrifft ein Halbleiterbauelement, insbesondere eine Diode für hohe Stromdichten, mit Metallisierungssystemen zum Anschluß von Zuleitungen an die Elektroden des Halbleiterkristalls mittels Drahtbondtechnik, Löten, Druckkontaktieren oder dergleichen.The invention relates to a semiconductor component, in particular one Diode for high current densities, with metallization systems for connecting leads to the electrodes of the semiconductor crystal using wire bonding, soldering, pressure contact or similar.
Es ist bekannt, daß Zweipole, deren Klemmenspannung bei gegebenem Strom bzw. gegebener Stromdichte mit zunehmender Temperatur abnimmt, zu thermischer Instabilität neigen.It is known that two-pole, the terminal voltage at a given Current or given current density decreases with increasing temperature, becoming more thermal Prone to instability.
Dioden sind solche Zweipole : In Durchlaßrichtung besitzen -sie einen negativen Temperaturkoeffizienten. Das bedeutet, daß die Stromverteilung instabil werden kann, sobald ein Flächenelement der--Diode, infolge einer Inhomogenität, etwa eines Lunkers im Lötkontakt, sich stärker erwärmt. als seine Umgebung. In diesem Fall nimmt die Durchlaßspannung dieses Elements ab. Hierdurch übernimmt es mehr Strom und erwärmt sich stärker, wodurch die Durchlaßspannung noch mehr ab nimmt usw.. Es kommt zum gefürchteten "Pinch In" und zur Zerstörung der Diode. Dieser Effekt tritt insbesondere dann besonders häufig auf, wenn Dioden im Sperrbereich als Z-Dioden betrieben werden. So müßte zum Beispiel eine Diode, die im Kraftfahrzeug -als- Hauptstromdiode einer Lichtmaschine eingesetzt ist, beim Betrieb ohne batterie in Sperrichtung denselben Strom zum nehmen können wie in Durchlaßrichtung und dies bei Zeitkonstanten des Systems -in- der Größenordnung von hundert Millisekunden. Da in diesem Fall die am Element liegende Spannung um ein bis zwei Größenordnungen höher ist als in Durchlaß--richtung, erwärmt- sich der Kristall außerordentlich rasch. Diodes are two-pole: they have one in the forward direction negative temperature coefficient. This means that the power distribution is unstable can be, as soon as a surface element of the - diode, due to an inhomogeneity, for example a blow hole in the solder contact, heats up more. than its surroundings. In this Case, the forward voltage of this element decreases. This way it takes on more Current and heats up more, whereby the forward voltage decreases even more etc. It comes to the dreaded "pinch in" and the destruction of the diode. This The effect occurs particularly frequently when the diodes are in the blocking range operated as Zener diodes. For example, a diode should be used in the motor vehicle -as- is used as the main current diode of an alternator when operating without a battery in the reverse direction to be able to take the same current as in the forward direction and this with time constants of the system -in the order of a hundred milliseconds. In this case, the voltage on the element is reduced by one to two orders of magnitude is higher than in the forward direction, the crystal heats up extraordinarily quickly.
Obwohl der Temperaturkoeffizient der Durchbruchspannung Uz bei Spannungen. oberhalb 6 Volt zunächst positiv ist, auf die Stromverteilung also stabilisierend wirkt, sind die Dioden jetzt gefährdet : Durch die aufzunehmende Stoßebcrgie wird die mittlere Kristalltemperatur sehr hoch - -zum Beispiel 300° C -, so daß etwa ein schlecht gekühltes Flächen- bzw.Although the temperature coefficient of the breakdown voltage Uz at voltages. is initially positive above 6 volts, thus stabilizing the current distribution acts, the diodes are now endangered: The shock energy to be absorbed is the mean crystal temperature is very high - for example 300 ° C - so that about a badly cooled surface or
-Volumeleme-nt des Kristalls bereits in den Bereich der durch thermische Paarbildung bedingten Eigenleitung gelangen kann.-Volumeleme-nt of the crystal already in the area of the by thermal Pair formation conditional self-conduction can arrive.
In diesem Bereich wechselt der Temperaturkoeffizient der Durchbruchspannung s sehr - steil von positiven zu negativen -Werten, die -Stromvarteilung wird instabil, es kommt zum "Pinch In", und das Bauelement wird zerstört. The temperature coefficient of the breakdown voltage changes in this area s very - steeply from positive to negative values, the current distribution becomes unstable, "Pinch In" occurs and the component is destroyed.
Ferner ist die Technologie des Metall-Halbleiter-Kontakts, der Hot-Carrier- oder Schottky-Diode, bekanntgeworden. Durch diese Technologie ist es möglich, die Eigenschaften einer Diode gezielt ihrer jeweiligen Aufgabe anzupassen und so zu kostengünstigen Lösungen zu kommen. Bei diesen Dioden wird die Sättigungsstromdichte nicht mehr vom Bandabstand des Kristallmaterials, sondern von der Differenz der Austrittsarbeiten zwischen ifalbleitermaterial und Kontaktmetall bestimmt, wobei die Differenz der Austrittsarbeiten stets kleiner als der Bandabstand des verwendeten Halbleitermaterials ist. Je kleiner diese Differenz ist, desto größer wird nach der Richardsonschen Gleichung die Sättigungsstrondichte, desto kleiner die Durchlaßspannung und die Durchlaßverluste. Da damit verbunden aber auch die Grenztemperatur für den Umschlag des Temperaturkoeffizienten der Durchbruchspannung von positiven zu negativen Werten absinkt, sind Schottky-Dioden dann besonders gefährdet, wenn die stromführende Kristallfläche Fkichenelemente mit höherer Temperatur aufweist. Furthermore, the technology of metal-semiconductor contact, the hot carrier or Schottky diode. This technology makes it possible to achieve the Properties of a Adapting the diode specifically to its respective task and so to come to cost-effective solutions. With these diodes, the saturation current density no longer from the band gap of the crystal material, but from the difference in Work functions between semiconductor material and contact metal are determined, whereby the difference in work functions is always smaller than the band gap of the one used Semiconductor material is. The smaller this difference, the larger it becomes after According to the Richardson equation, the lower the forward voltage, the lower the saturation density and the transmission losses. Since this is also associated with the limit temperature for the The temperature coefficient of the breakdown voltage changes from positive to negative Values drops, Schottky diodes are particularly at risk when the current-carrying Crystal surface has Fkichenelemente with higher temperature.
Der Erfindung liegt die Aufgabe zugrunde, ein Halbleiterbauelement der eingangs genannten Art so auszubilden, daß Temperaturgradienten innerhalb der stromführenden Kristallfläche des Halbleiterkörpers weitgehend vermieden werden.The invention is based on the object of a semiconductor component of the type mentioned in such a way that temperature gradients within the current-carrying crystal face of the semiconductor body can be largely avoided.
Erfindungsgemä.ß wird diese Aufgabe durch mindestens eine Metallschicht aus einem Material mit guter Wärmeleitfähigkeit und hinreichender Dicke zwischen Halbleiteroberfläche und Bond-, Löt, Druckkontakt oder dergleichen gelöst.According to the invention, this object is achieved by at least one metal layer made of a material with good thermal conductivity and sufficient thickness between Semiconductor surface and bond, solder, pressure contact or the like solved.
Anhand der Zeichnung wird die Erfindung näher erläutert.The invention is explained in more detail with the aid of the drawing.
Es zeigen: Fig. 1 eine herkömmliche Schottky-Diode im Schnitt, Fig. 2 eine Schottky-Diode gemäß der Erfindung im Schnitt.They show: FIG. 1 a conventional Schottky diode in section, Fig. 2 shows a Schottky diode according to the invention in section.
In Figur 1 ist mit 1 der aus Kupfer bestehende Gehäuseboden der Schottky-Diode bezeichnet. Mit 2 ist ein hochdotiertes Silizium-Substrat bezeichnet. Dieses Substrat weist an seiner Oberseite eine gezielt dotierte Epitaxieschicht 3 auf. Auf den äußeren Rand der Epitaxieschicht 3 ist eine dünne Oxidschicht 5 und auf diese eine dicke Oxidschicht 4 aufgebracht.In FIG. 1, 1 is the housing bottom of the Schottky diode, which is made of copper designated. With a highly doped silicon substrate is designated. This substrate has a specifically doped epitaxial layer 3 on its upper side. On the outside The edge of the epitaxial layer 3 is a thin oxide layer 5 and a thick one on top of it Oxide layer 4 applied.
Die dünne Oxidschicht 5 dient dabei als Feldoxid zur Unterdrückung von Feldemission am Rand des Metall-Halbleiterkontakts. Mit 6 ist eine Aluminiumschicht bezeichnet, die eine Dicke von etwa 2 bis 5/um hat. Auf diese Aluminiumschicht ist eine vergleichsweise dünne Nickelschicht 7 aufgebracht, durch die eine lötbare Oberfläche erzeugt wird. Mit 8 ist eine Lotschicht aus Blei-Zinn-Weichlot und mit 9 ein Kopfdraht aus Kupfer bezeichnet. An seiner Unterseite ist das Silizium-Substrat 2 über eine Zwischenschicht 10 aus Nickelsilizid, eine Nickelsehicht 11 und eine Lotschicht 12 aus Blei-Zinn-Weichlot mit dem Gchäuseboden 1 verötet. Die beiden Nickelschichten 7 und 11 können zusätzlich iit einer Hauchvergoldung überzogen sein, um eine bessere Benetzung mit dem Blei-Zinn-Weichlot zu erreichen.The thin oxide layer 5 serves as a field oxide for suppression of field emission at the edge of the metal-semiconductor contact. With 6 is an aluminum layer referred to, which has a thickness of about 2 to 5 / µm. On top of this aluminum layer is a comparatively thin nickel layer 7 is applied through which a solderable surface is produced. With 8 is a solder layer made of lead-tin-soft solder and with 9 a head wire made of copper. On its underside, the silicon substrate 2 is on a Intermediate layer 10 made of nickel silicide, a nickel layer 11 and a solder layer 12 made of lead-tin-soft solder soldered to the housing base 1. The two layers of nickel 7 and 11 can also be covered with a touch of gold for a better finish To achieve wetting with the lead-tin-soft solder.
Wegen der unterschiedlichen Ausdehnungskoeffizienten von Kupfer (Gehäuseboden und Kopfdraht) und Silizium dürfen die Lotschichten 8 und 12 nicht zu dünn gemacht werden. Sie müssen nämlich die bei Temperaturänderungen auftretenden Schubspannungen aufnehmen können. Da sie von Hause aus schlechte Wärmeleiter sind, wird der thermische Kurzschluß des aus Kupfer bestehenden Kopfdrahts 9 durch die ca. 30 um dicke Lotschicht 8 in Bezug auf die Epitaxieschicht 3 der IIalbleiterkristalls nahezu unwirksam. Das gleiche gilt auch für den Lötkontakt am Gehäuseboden. Doch ist dort die Auswirkung erheblich geringer, da zwischen der Epitaxieschicht 3 und dem Lot 12 das ca. 150 um dicke Substrat aus Silizium liegt, und da Silizium eine erheblich bessere Wärmeleitfähigkeit als ein Blei-Zinn-Weichlot besitzt. Besonders kritisch wird dieser Aufbau des Kontaktierungssystems, wenn sich in einer der Lotschiejiten 8 oder 12, wie bei 13 angedeutet, ein Lunker oder eine nicht benetzende Stelle befindet.Because of the different expansion coefficients of copper (case back and head wire) and silicon must not make the solder layers 8 and 12 too thin will. This is because you have to withstand the shear stresses that occur when the temperature changes be able to record. Since they are inherently poor conductors of heat, the thermal Short circuit of the head wire 9, which is made of copper, through the approximately 30 μm thick layer of solder 8 in relation to the epitaxial layer 3 of the semiconductor crystal is almost ineffective. The same applies to the solder contact on the bottom of the housing. Yet there is the effect considerable less, since between the epitaxial layer 3 and the solder 12 it is approximately 150 μm thick The substrate is made of silicon, and since silicon has a significantly better thermal conductivity than a lead-tin soft solder. This structure of the contacting system becomes particularly critical, if there is a blowhole in one of the Lotschiejiten 8 or 12, as indicated at 13 or a non-wetting point.
Deshalb ist bei dem erfindungsgcmäßen Ausführungsbeispiel nach Figur 2 die dünne Aluminium-Nickel-Schicht 6, 7 durch die Silberschicht 111 verstärkt, deren Dicke mindestens etwa 5 lum, bevorzugt jedoch 10 und mehr /um beträgt. Um insbesondere bei nicht hermetisch dichtem Einbau die Wanderung von Silberionen zu verhindern, ist eine nickelschicht 15 zur Versiegelung der Oberflache vorgesehen.Therefore, in the embodiment according to the invention according to FIG 2 the thin aluminum-nickel layer 6, 7 reinforced by the silver layer 111, the thickness of which is at least about 5 μm, but preferably 10 and more μm. Around especially if the installation is not hermetically sealed, the migration of silver ions increases prevent, a nickel layer 15 is provided to seal the surface.
Die Erfindung ist nicht auf das anhand der Figur 2 beschriebene Ausführungsbeispiel beschränkt.The invention is not based on the exemplary embodiment described with reference to FIG limited.
Vielmehr kann beispielsweise die Schicht 14 auch aus anderen, gut wärmeleitenden Idetallen oder Metallegierungen bestehen.Rather, for example, the layer 14 can also consist of others, well thermally conductive Idetallen or metal alloys exist.
Ein besonders einfaches System ergibt sich, wenn das Kontaktmetall entsprechend Figur 1 aus Aluminium besteht. In diesem Fall läßt sich die Schicht 6 entsprechend dicker ausführen, so daß die Schichten 7 und 14 entfallen können. Allerdings ist Aluminium nicht ganz so wirksam wie Silber oder Kupfer.A particularly simple system results when the contact metal according to Figure 1 consists of aluminum. In this case, the layer 6 make correspondingly thicker, so that the layers 7 and 14 can be omitted. However, aluminum is not quite as effective as silver or copper.
Wegen seiner Duktilität ist Gold als Zwischenschicht lli besonders geeignet.Because of its ductility, gold is a special intermediate layer III suitable.
An die Stelle des Aluminiums kann auch ein anderes Metall, wie beispielsweise Chrom, Palladium, Platin, Titan oder ein anderes geeignetes Material treten, das dann allerdings nur in Schichtdicken um 0,2 /um angewandt wird, wobei sich der Aufbau der Schichten nach den physikalischen Gegebenheiten richtet.Instead of aluminum, another metal, such as, for example, can also be used Chromium, palladium, platinum, titanium or any other suitable material that occurs then, however, only in layer thicknesses around 0.2 / um is used, whereby the structure the layers according to the physical conditions.
Auch in allen anderen nur denkbaren Fällen läßt sich der Gegenstand der Erfindung, nämlich die dicke Zwischenschicht aus gut wärmeleitendem Material, anwenden. Sie ist besonders wichtig bei Paarungen mit niedriger Differenz der Austrittsarbeiten, wenn eine hohe Stoßstromfestigkeit erreicht werden soll. Auch bei Avalanche-Dioden mit normalem pn-Übergang läßt sich damit eine höhere Stoßstromfestigkeit erzielen.The object can also be used in all other conceivable cases of the invention, namely the thick intermediate layer made of a material that conducts heat well, use. It is particularly important for pairings with a low difference in work functions, if a high surge current resistance is to be achieved. Even with avalanche diodes With a normal pn junction, a higher surge current resistance can be achieved.
L e e r s e i t eL e r s e i t e
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19762642721 DE2642721A1 (en) | 1976-09-23 | 1976-09-23 | Semiconductor diode for high current density - has metal layers of good thermal conductivity and sufficient thickness between semiconductor surface and contact |
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Application Number | Priority Date | Filing Date | Title |
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DE19762642721 DE2642721A1 (en) | 1976-09-23 | 1976-09-23 | Semiconductor diode for high current density - has metal layers of good thermal conductivity and sufficient thickness between semiconductor surface and contact |
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DE2642721A1 true DE2642721A1 (en) | 1978-04-06 |
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DE19762642721 Ceased DE2642721A1 (en) | 1976-09-23 | 1976-09-23 | Semiconductor diode for high current density - has metal layers of good thermal conductivity and sufficient thickness between semiconductor surface and contact |
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DE (1) | DE2642721A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3516995A1 (en) * | 1984-05-11 | 1985-11-14 | Mitsubishi Denki K.K., Tokio/Tokyo | Semiconductor device |
EP0292015A1 (en) * | 1987-05-21 | 1988-11-23 | Siemens Aktiengesellschaft | Semiconductor power element |
DE102016117826A1 (en) | 2016-09-21 | 2018-03-22 | Infineon Technologies Ag | ELECTRONIC DEVICE, ELECTRONIC MODULE AND MANUFACTURING METHOD THEREFOR |
-
1976
- 1976-09-23 DE DE19762642721 patent/DE2642721A1/en not_active Ceased
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3516995A1 (en) * | 1984-05-11 | 1985-11-14 | Mitsubishi Denki K.K., Tokio/Tokyo | Semiconductor device |
EP0292015A1 (en) * | 1987-05-21 | 1988-11-23 | Siemens Aktiengesellschaft | Semiconductor power element |
US4953003A (en) * | 1987-05-21 | 1990-08-28 | Siemens Aktiengesellschaft | Power semiconductor device |
DE102016117826A1 (en) | 2016-09-21 | 2018-03-22 | Infineon Technologies Ag | ELECTRONIC DEVICE, ELECTRONIC MODULE AND MANUFACTURING METHOD THEREFOR |
US10741402B2 (en) | 2016-09-21 | 2020-08-11 | Infineon Technologies Ag | Electronic device, electronic module and methods for fabricating the same |
US11615963B2 (en) | 2016-09-21 | 2023-03-28 | Infineon Technologies Ag | Electronic device, electronic module and methods for fabricating the same |
DE102016117826B4 (en) | 2016-09-21 | 2023-10-19 | Infineon Technologies Ag | ELECTRONIC MODULE AND PRODUCTION METHOD THEREOF |
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