DE102015200504A1 - Method for producing a bondable metallization and corresponding bondable metallization - Google Patents
Method for producing a bondable metallization and corresponding bondable metallization Download PDFInfo
- Publication number
- DE102015200504A1 DE102015200504A1 DE102015200504.6A DE102015200504A DE102015200504A1 DE 102015200504 A1 DE102015200504 A1 DE 102015200504A1 DE 102015200504 A DE102015200504 A DE 102015200504A DE 102015200504 A1 DE102015200504 A1 DE 102015200504A1
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- metallization
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- copper
- bondable
- semiconductor substrate
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- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
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Abstract
Die Erfindung betrifft ein Verfahren zur Herstellung einer bondbaren Metallisierung (1) auf einem Halbleitersubstrat (3) für einen Leistungshalbleiter, wobei die bondbare Metallisierung (1) eine erste Metallisierungslage (M1), welche auf das Halbleitersubstrat (3) aufgebracht ist, und eine zweite Metallisierungslage (M2) aufweist, welche auf die erste Metallisierungslage (M1) aufgebracht ist, und eine korrespondierende bondbare Metallisierung (1). Erfindungsgemäß wird zur Ausbildung der zweiten Metallisierungslage (M2) eine Kupfermetallisierung (Cu) auf die erste Metallisierungslage (M1) aufgebracht, wobei auf die Kupfermetallisierung (Cu) eine Aluminium enthaltende Passivierungsschicht (PS) abgeschieden wird.The invention relates to a method for producing a bondable metallization (1) on a semiconductor substrate (3) for a power semiconductor, wherein the bondable metallization (1) has a first metallization layer (M1) applied to the semiconductor substrate (3) and a second metallization layer (1) Metallization layer (M2), which is applied to the first metallization layer (M1), and a corresponding bondable metallization (1). According to the invention, a copper metallization (Cu) is applied to the first metallization layer (M1) to form the second metallization layer (M2), wherein an aluminum-containing passivation layer (PS) is deposited on the copper metallization (Cu).
Description
Die Erfindung geht aus von einem Verfahren zur Herstellung einer bondbaren Metallisierung nach der Gattung des unabhängigen Patentanspruchs 1 sowie von einer bondbaren Metallisierung nach der Gattung des unabhängigen Patentanspruchs 7.The invention is based on a method for producing a bondable metallization according to the preamble of independent claim 1 and of a bondable metallization according to the preamble of independent claim 7.
Im Bereich Leistungselektronik werden gegenwärtig Aluminium-Bändchen- und Aluminium-Dickdraht-Bonds verwendet, um die Oberseite von Leistungsbauelementen, wie beispielsweise den Source-Kontakt bei einem MOSFET (Metal Oxide Semiconductor Field-Effect Transistor: Metall-Oxid-Halbleiter-Feldeffekttransistor), den Emitter bei einem IGBT (Insulated-Gate Bipolar Transistor: Bipolartransistor mit isolierter Gate-Elektrode) usw., zu kontaktieren. Die Verwendung von Kupfer-Bändchen- und Kupfer-Dickdraht-Bonds ist momentan Gegenstand der Forschung, eine Lebensdauererhöhung der Kontaktierung bis zu einem Faktor 10 gegenüber den Aluminium-Bonds wird vorausgesagt. Dies liegt an der höheren elektrischen und thermischen Leitfähigkeit, an der höheren Streckgrenze sowie an der deutlich höheren Elektromigrationsresistenz von Kupfer (Cu) gegenüber Aluminium (Al). Silber-Bonds finden aufgrund des hohen Materialpreises in Verbindung mit dem hohen Materialbedarf in der Leistungselektronik keine oder kaum Verwendung.In power electronics, aluminum ribbon and aluminum thick-wire bonds are currently used to cover the top of power devices, such as the source contact in a Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) MOSFET. to contact the emitter in an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), etc. The use of copper-ribbon and copper-thick-wire bonds is currently the subject of research, an increase in contact lifetime up to a factor of 10 compared to aluminum bonds is predicted. This is due to the higher electrical and thermal conductivity, the higher yield strength and the significantly higher electromigration resistance of copper (Cu) over aluminum (Al). Silver bonds are due to the high material price in connection with the high demand for materials in power electronics little or no use.
Durch die höhere Härte von Kupfer gegenüber Aluminium wird das korrespondierende Bondpad bei der Verwendung von Kupfer-Bändchen- bzw. Kupfer-Dickdraht-Bonds übermäßig gestresst und dadurch verformt. Eine deutlich härtere Metallisierung gegenüber der standardmäßig verwendeten Aluminium-Metallisierung mit einer Stärke von ca. 5 µm ist daher erforderlich. Derzeit ist die Forschung und Erprobung hauptsächlich auf Kupfer-Metallisierungen fixiert. Eine Möglichkeit zur Aufbringung von dicken Kupferschichten mit einer Stärke von mehr als 5 µm basiert bei bekannten Verfahren auf einer elektrochemischen bzw. galvanischen Abscheidung.Due to the higher hardness of copper compared to aluminum, the corresponding bonding pad becomes excessively stressed when using copper ribbon or copper thick-wire bonds and thus deformed. A significantly harder metallization compared to the standard aluminum metallization with a thickness of about 5 microns is therefore required. Currently, research and testing is mainly focused on copper metallization. One possibility for applying thick copper layers with a thickness of more than 5 μm is based on electrochemical or galvanic deposition in known methods.
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren zur Herstellung einer bondbaren Metallisierung mit den Merkmalen des unabhängigen Patentanspruchs 1 sowie die korrespondierende bondbare Metallisierung mit den Merkmalen des unabhängigen Patentanspruchs 7 haben demgegenüber den Vorteil, dass ein kostengünstiger Prozess zum Schutz einer für einen Kupfer-Dickdraht-Bondprozess geeigneten Kupfermetallisierung vor übermäßiger Oxidation bereitgestellt wird, welche die erforderliche Belastbarkeit aufweist. Ausführungsformen der vorliegenden Erfindung umfassen die Reinigung der Kupfermetallisierung und deren Verkappung durch Abscheiden einer Passivierungsschicht mittels eines geeigneten Verfahrens und die Strukturierung durch einen nasschemischen Prozess.The inventive method for producing a bondable metallization with the features of independent claim 1 and the corresponding bondable metallization with the features of independent claim 7 have the advantage that a cost-effective process for protecting a copper metallization suitable for a copper thick-wire bonding process from excessive Oxidation is provided, which has the required capacity. Embodiments of the present invention include the purification of copper metallization and its capping by depositing a passivation layer by a suitable method and patterning by a wet chemical process.
Ausführungsformen der vorliegenden Erfindung stellen ein Verfahren zur Herstellung einer bondbaren Metallisierung auf einem Halbleitersubstrat für einen Leistungshalbleiter zur Verfügung. Hierbei weist die bondbare Metallisierung eine erste Metallisierungslage, welche auf das Halbleitersubstrat aufgebracht ist, und eine zweite Metallisierungslage, welche auf die erste Metallisierungslage aufgebracht ist, auf. Erfindungsgemäß wird zur Ausbildung der zweiten Metallisierungslage eine Kupfermetallisierung auf die erste Metallisierungslage aufgebracht, wobei auf die Kupfermetallisierung eine Aluminium enthaltende Passivierungsschicht abgeschieden wird.Embodiments of the present invention provide a method for making a bondable metallization on a semiconductor substrate for a power semiconductor. Here, the bondable metallization has a first metallization layer, which is applied to the semiconductor substrate, and a second metallization layer, which is applied to the first metallization layer. According to the invention, a copper metallization is applied to the first metallization layer to form the second metallization layer, wherein an aluminum-containing passivation layer is deposited on the copper metallization.
Zudem wird eine bondbare Metallisierung auf einem Halbleitersubstrat für einen Leistungshalbleiter vorgeschlagen, welche eine auf das Halbleitersubstrat aufgebrachte erste Metallisierungslage und eine auf die erste Metallisierungslage aufgebrachte zweite Metallisierungslage umfasst. Erfindungsgemäß umfasst die zweite Metallisierungslage eine Kupfermetallisierung, auf welcher eine Aluminium enthaltende Passivierungsschicht abgeschieden ist.In addition, a bondable metallization on a semiconductor substrate for a power semiconductor is proposed which comprises a first metallization layer applied to the semiconductor substrate and a second metallization layer applied to the first metallization layer. According to the invention, the second metallization layer comprises a copper metallization on which an aluminum-containing passivation layer is deposited.
Die Passivierungsschicht besteht vorzugsweise aus reinem Aluminium, kann aber auch Legierungsbestandteile, wie beispielsweise Kupfer (Cu) oder Silizium (Si) beinhalten. Dies ermöglicht in vorteilhafter Weise einen hervorragenden Oxidationsschutz der Kupfermetallisierung und ist auch bei rauen Kupferoberflächen einsetzbar. Die Aluminiumpassivierung wird ohne Einsatz von problematischen oder aggressiven Chemikalien in nur einem zusätzlichen Prozessschritt vorzugsweise über eine chemische oder physikalische Dampfphasenabscheidung abgeschieden und anschließend strukturiert. Außerdem sind nach dem Aufbringen der Kupfermetallisierung auf die erste Metallisierungslage keine hohen Temperaturen zum Abscheiden der Aluminiumpassivierung erforderlich, welche sich negativ auf die Haftung der gesamten Metallisierung auswirken können. Die Aluminiumpassivierung weist hervorragende Eigenschaften bei einem Bondprozess unter Verwendung von Kupfer-Draht oder Kupfer-Bändchen auf, wobei die Aluminiumpassivierung nicht in der Bondfläche verbleibt, sondern eine Verschweißung zwischen Cu-Metallisierung und Cu-Draht erfolgt.The passivation layer is preferably made of pure aluminum, but may also include alloying constituents such as copper (Cu) or silicon (Si). This advantageously allows excellent oxidation protection of the copper metallization and can also be used with rough copper surfaces. The aluminum passivation is deposited without the use of problematic or aggressive chemicals in only one additional process step, preferably via a chemical or physical vapor deposition and then patterned. In addition, after application of the copper metallization to the first metallization layer, no high temperatures are required for depositing the aluminum passivation, which may adversely affect the adhesion of the overall metallization. The aluminum passivation has excellent properties in a bonding process using copper wire or copper tapes, wherein the aluminum passivation does not remain in the bonding surface, but a welding between Cu metallization and Cu wire takes place.
Ausführungsformen des erfindungsgemäßen Verfahrens zur Herstellung einer bondbaren Metallisierung finden ihren Einsatz in der Fertigung von Halbleiterbauelementen, insbesondere von Leistungshalbleiterbauelementen. Ausführungsformen der erfindungsgemäßen bondbaren Metallisierung finden Anwendung für neuartige hochzuverlässige Aufbau- und Verbindungstechniken, wie z.B. dem Kupfer-Dickdrahtbonden, welche wiederum in gängigen leistungselektronischen Modulen Anwendung finden (z.B. Lenkungssteuerung).Embodiments of the method according to the invention for producing a bondable metallization are used in the production of semiconductor components, in particular of power semiconductor components. Embodiments of the bondable metallization of the invention find application for novel Highly reliable assembly and connection techniques, such as copper thick-wire bonding, which in turn are used in common power electronic modules (eg steering control).
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen und Weiterbildungen sind vorteilhafte Verbesserungen des im unabhängigen Patentanspruch 1 angegebenen Verfahrens zur Herstellung einer bondbaren Metallisierung und der im unabhängigen Patentanspruch 7 angegebenen bondbaren Metallisierung möglich.The measures and refinements recited in the dependent claims advantageous improvements of the independent claim 1 method for producing a bondable metallization and the specified in the independent claim 7 bondable metallization are possible.
Besonders vorteilhaft ist, dass die erste Metallisierungslage und/oder die Passivierungsschicht durch physikalische oder chemische Dampfphasenabscheidung abgeschieden werden können. Hierbei wird die erste Metallisierungslage auf dem Halbleitersubstrat abgeschieden und die Passivierungsschicht wird auf der Kupfermetallisierung abgeschieden. Zudem kann die erste Metallisierungslage durch einen Lift-Off-Prozess strukturiert werden. Somit erfolgt die Aufbringung der ersten Metallisierungslage und/oder der Passivierungsschicht in vorteilhafter Weise durch aus dem Stand der Technik bekannten und erprobten Prozessschritten nach standardmäßigen Halbleitertechnologien.It is particularly advantageous that the first metallization layer and / or the passivation layer can be deposited by physical or chemical vapor deposition. In this case, the first metallization layer is deposited on the semiconductor substrate and the passivation layer is deposited on the copper metallization. In addition, the first metallization layer can be structured by a lift-off process. Thus, the application of the first metallization layer and / or the passivation layer advantageously takes place by way of process steps known from the prior art and tested according to standard semiconductor technologies.
In vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens kann die Kupfermetallisierung durch Aufdrucken einer Paste oder Tinte mit Kupfernanopartikeln und mittels eines thermischen Sinterprozesses auf die erste Metallisierungslage aufgebracht werden. Alternativ kann die Kupfermetallisierung über einen galvanischen Abscheidungsprozess oder durch Plasmaspritzen von Kupferpartikeln auf die erste Metallisierungslage aufgebracht werden. Das Aufbringen der Kupfermetallisierung mittels Drucken und Sintern erfordert in vorteilhafter Weise weniger Prozessschritte und ermöglicht im Vergleich mit einer galvanischen Abscheidung eine einfachere Prozessführung. Zudem ist die gedruckte und gesinterte Kupfermetallisierung im Vergleich mit einer galvanisch abgeschiedenen Kupfermetallisierung poröser und bringt bei gleicher Schichtstärke in vorteilhafte Weise weniger thermische Spannung in das System ein.In an advantageous embodiment of the method according to the invention, the copper metallization can be applied to the first metallization layer by printing a paste or ink with copper nanoparticles and by means of a thermal sintering process. Alternatively, the copper metallization can be applied to the first metallization layer via a galvanic deposition process or by plasma spraying of copper particles. The application of the copper metallization by means of printing and sintering advantageously requires fewer process steps and, in comparison with a galvanic deposition, makes a simpler process management possible. In addition, the printed and sintered copper metallization is more porous compared to electrodeposited copper metallization, and advantageously introduces less thermal stress into the system for the same layer thickness.
In weiterer vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens kann die Kupfermetallisierung mit einer vorgegebenen Struktur auf die erste Metallisierungslage aufgebracht werden. Dadurch beinhaltet das Aufbringen der Kupfermetallisierung auf die erste Metallisierungslage bereits die Strukturierung der Kupfermetallisierung. Dadurch kann ein teurer und aufwendiger lithographischer Prozess eingespart werden. Alternativ kann die Kupfermetallisierung nach dem Aufbringen durch einen solchen fotolithografischen Prozess mit anschließendem Ätzprozess strukturiert werden.In a further advantageous embodiment of the method according to the invention, the copper metallization can be applied with a predetermined structure to the first metallization. As a result, the application of the copper metallization to the first metallization layer already involves the structuring of the copper metallization. As a result, an expensive and expensive lithographic process can be saved. Alternatively, the copper metallization after application may be patterned by such a photolithographic process followed by an etch process.
In weiterer vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens kann die Passivierungsschicht durch einen fotolithografischen Prozess mit anschließendem Ätzprozess strukturiert werden.In a further advantageous embodiment of the method according to the invention, the passivation layer can be structured by a photolithographic process followed by an etching process.
In vorteilhafter Ausgestaltung der erfindungsgemäßen Metallisierung kann die Kupfermetallisierung eine Stärke im Bereich von 8 bis 35µm aufweisen. Dadurch kann in vorteilhafter Weise eine geeignete Kupfermetallisierung mit einer ausreichenden Stärke für Kupfer-Bändchen- und Kupfer-Dickdraht-Bonds zur Verfügung gestellt werden. Die Passivierungsschicht kann eine Stärke im Bereich von 0,02 bis 0,1µm aufweisen.In an advantageous embodiment of the metallization of the invention, the copper metallization may have a thickness in the range of 8 to 35μm. This advantageously provides suitable copper metallization of sufficient strength for copper ribbon and copper thick-wire bonds. The passivation layer may have a thickness in the range of 0.02 to 0.1 μm.
In weiterer vorteilhafter Ausgestaltung der erfindungsgemäßen Metallisierung kann die erste Metallisierungslage eine Kontaktmaterialschicht und/oder eine Diffusionsbarriereschicht und/oder eine Haftvermittlerschicht und/oder eine erste Kupferschicht aufweisen, wobei die erste Metallisierungslage eine Gesamtstärke im Bereich von 0,1 bis 2µm aufweisen kann.In a further advantageous embodiment of the metallization according to the invention, the first metallization layer may comprise a contact material layer and / or a diffusion barrier layer and / or a primer layer and / or a first copper layer, wherein the first metallization layer may have a total thickness in the range of 0.1 to 2μm.
Die Kontaktmaterialschicht, die Diffusionsbarriereschicht und die Haftvermittlerschicht können beispielsweise jeweils eine Stärke im Bereich von 0,01 bis 0,2µm aufweisen, und die erste Kupferschicht kann beispielsweise eine Stärke im Bereich von 0,05 bis 1µm aufweisen.For example, the contact material layer, the diffusion barrier layer, and the primer layer may each have a thickness in the range of 0.01 to 0.2 μm, and the first copper layer may have a thickness in the range of 0.05 to 1 μm, for example.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. In den Zeichnungen bezeichnen gleiche Bezugszeichen Komponenten bzw. Elemente, die gleiche bzw. analoge Funktionen ausführen.An embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description. In the drawings, like reference numerals designate components that perform the same or analog functions.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Ausführungsformen der ErfindungEmbodiments of the invention
Wie aus
Zur Herstellung einer solchen bondbaren Metallisierung
Die Kupfermetallisierung Cu kann beispielsweise durch Aufdrucken einer Paste oder Tinte mit Kupfernanopartikeln und mittels eines thermischen Sinterprozesses auf die erste Metallisierungslage M1 aufgebracht werden. Alternativ kann die Kupfermetallisierung Cu über einen galvanischen Abscheidungsprozess oder durch Plasmaspritzen von Kupferpartikeln auf die erste Metallisierungslage M1 aufgebracht werden.The copper metallization Cu can be applied to the first metallization layer M1, for example, by printing a paste or ink with copper nanoparticles and by means of a thermal sintering process. Alternatively, the copper metallization Cu can be applied to the first metallization layer M1 via a galvanic deposition process or by plasma spraying of copper particles.
Hierbei kann das Halbleitersubstrat
Wie aus
Die erste Metallisierungslage M1 weist im dargestellten Ausführungsbeispiel eine Gesamtstärke im Bereich von 0,1 bis 2µm auf. Die Kontaktmaterialschicht KS, die Diffusionsbarriereschicht DS und die Haftvermittlerschicht HS weisen jeweils eine Stärke im Bereich von 0,01 bis 0,2µm auf. Die erste Kupferschicht Cu1 weist eine Stärke im Bereich von 0,05 bis 1µm auf. Die zweite Metallisierungslage M2 bzw. die Kupfermetallisierung Cu weist eine Stärke im Bereich von 8 bis 35µm auf.In the exemplary embodiment illustrated, the first metallization layer M1 has a total thickness in the range of 0.1 to 2 μm. The contact material layer KS, the diffusion barrier layer DS and the adhesion promoter layer HS each have a thickness in the range of 0.01 to 0.2 μm. The first copper layer Cu1 has a thickness in the range of 0.05 to 1 μm. The second metallization layer M2 or the copper metallization Cu has a thickness in the range of 8 to 35 μm.
Auf die erste Metallisierungslage M1 wird beispielsweise mittels eines Tintenstrahl-, Sieb- oder Schablonendruckes eine druckbare Paste oder Tinte aufgebracht, welche Kupfernanopartikel beinhaltet. Nach dem Drucken kann ein temperaturbehafteter Trocknungsschritt durchgeführt werden, um vorhandene Lösungsmittel auszutreiben. Anschließend werden die Pastendepots durch Wärmeeinwirkung im Temperaturbereich von 180–400°C versintert, so dass die Kupfermetallisierung Cu entsteht. Das Abscannen der Strukturen kann beispielsweise mit Laserlicht durchgeführt werden, wobei eine ganzflächige Erhitzung mittels Infrarotquelle oder durch Temperung in einem Ofen erfolgen kann.For example, by means of an ink-jet, screen or stencil printing, a printable paste or ink containing copper nanoparticles is applied to the first metallization layer M1. After printing, a temperature-sensitive drying step may be performed to drive off existing solvents. Subsequently, the paste depots are sintered by exposure to heat in the temperature range of 180-400 ° C, so that the copper metallization Cu is formed. The scanning of the structures can be carried out, for example, with laser light, wherein a full-surface heating can be done by infrared source or by annealing in an oven.
Alternativ kann die Kupfermetallisierung Cu der zweiten Metallisierungslage M2 über einen galvanischen Abscheidungsprozess auf die ersten Metallisierungslage M1 aufgebracht werden, wobei dieser ganzflächig oder in durch einen vorher aufgebrachten Fotolack definierte Flächen erfolgen kann. Des Weiteren kann die Kupfermetallisierung Cu der zweiten Metallisierungslage M2 durch Plasmaspritzen von Kupferpartikeln aufgebracht werden, wobei diese auch weiter Legierungselemente beinhalten können.Alternatively, the copper metallization Cu of the second metallization layer M2 can be applied to the first metallization layer M1 via a galvanic deposition process, wherein this can be carried out over the whole area or in areas defined by a previously applied photoresist. Furthermore, the copper metallization Cu of the second metallization layer M2 can be applied by plasma spraying of copper particles, which can also include further alloying elements.
Falls die Kupfermetallisierung Cu vorher nicht bereits strukturiert wurde, erfolgt ein Rückätzen der vorher aufgebrachten ganzflächigen Kupfermetallisierung Cu, wobei die gedruckten Pastenflächen und/oder Teile der vorher abgeschiedenen Kupfermetallisierung Cu von einem Fotolack abgedeckt werden können. Das Rückätzen kann beispielsweise mittels nasschemischer Verfahren oder mittels reaktivem Ionenätzen erfolgen.If the copper metallization Cu has not previously been patterned, the previously applied full-area copper metallization Cu is etched back, whereby the printed paste surfaces and / or parts of the previously deposited copper metallization Cu can be covered by a photoresist. The etching back can be done for example by wet chemical methods or by reactive ion etching.
Auf die Kupfermetallisierung Cu der zweiten Metallisierungslage M2 wird dann die dünne Passivierungsschicht PS über eine chemische oder physikalische Dampfphasenabscheidung abgeschieden, welche vorzugsweise aus reinem Aluminium besteht, aber auch Legierungsbestandteile, wie beispielsweise Kupfer (Cu) und Silizium (Si) beinhalten kann. Wie oben bereits ausgeführt ist, weist die Passivierungsschicht PS vorzugsweise eine Schichtstärke im Bereich zwischen 20 nm und 100 nm und insbesondere eine Stärke von 50 nm auf. Die Abscheidung erfolgt über chemische oder physikalische Dampfphasenabscheidung vorzugsweise über DC-Sputtern. Die erste Kupferschicht Cu1 in der ersten Metallisierungslage M1, welche die Grundlage für die Kupfermetallisierung Cu bildet, kann vor oder nach der Abscheidung strukturiert werden. Die Passivierungsschicht PS kann durch einen geeigneten Prozessschritt (O2-Plasma, Temperung in Sauerstoff-Atmosphäre) weiter oxidiert werden kann, um eine definierte passivierende Oxidschicht zu erhalten. Anschließend wird die Passivierungsschicht PS strukturiert, vorzugsweise durch einen fotolithographischen Prozess und anschließendes nasschemisches Ätzen mit einem geeigneten Ätzmittel. Hierbei kann die Strukturierung vorzugsweise in einem einzigen Schritt mit der Entwicklung des Fotoresists erfolgen, wobei für die Entwicklung des Fotoresists ein geeigneter Entwickler verwendet wird, welcher auf Tetramethyl-Ammonium-Hydroxid (TMAH) basiert. Zudem kann der Fotoresist weiter für die Strukturierung der darunterliegenden Schichten KS, DS, HS verwendet werden, welche ebenfalls nasschemisch oder vorzugsweise durch einen geeigneten Trockenätzprozess strukturiert werden. Alternativ können die unter der ersten Kupferschicht Cu1 liegenden Schichten KS, DS, HS der ersten Metallisierungslage M1 in einem nachfolgenden Prozessschritt strukturiert werden.The thin passivation layer PS is then deposited on the copper metallization Cu of the second metallization layer M2 via a chemical or physical vapor deposition, which preferably consists of pure aluminum but may also include alloy constituents such as, for example, copper (Cu) and silicon (Si). As already explained above, the passivation layer PS preferably has a layer thickness in the range between 20 nm and 100 nm and in particular a thickness of 50 nm. Deposition takes place via chemical or physical vapor deposition, preferably via DC sputtering. The first copper layer Cu1 in the first metallization layer M1, which forms the basis for the copper metallization Cu, can be patterned before or after the deposition. The passivation layer PS can be further oxidized by a suitable process step (O 2 plasma, annealing in oxygen atmosphere) in order to obtain a defined passivating oxide layer. Subsequently, the passivation layer PS is patterned, preferably by a photolithographic process and subsequent wet-chemical etching with a suitable etchant. In this case, the patterning can preferably be carried out in a single step with the development of the photoresist, wherein for the development of the photoresist, a suitable developer is used, which is based on tetramethyl ammonium hydroxide (TMAH). In addition, the photoresist can be further used for the structuring of the underlying layers KS, DS, HS, which are also structured wet-chemically or preferably by a suitable dry etching process. Alternatively, the layers KS, DS, HS of the first metallization layer M1 underlying the first copper layer Cu1 can be patterned in a subsequent process step.
Für den Aufbau der erfindungsgemäßen bondbaren Metallisierung
Ausführungsformen der vorliegenden Erfindung können in der Fertigung von Halbleiterbauelementen eingesetzt werden. Die bondbare Metallisierung kann beispielsweise für neuartige hochzuverlässige Aufbau- und Verbindungstechniken, wie z.B. dem Kupfer-Dickdrahtbonden, eingesetzt werden, welche wiederum in gängigen leistungselektronischen Modulen Anwendung finden.Embodiments of the present invention may be used in the fabrication of semiconductor devices. The bondable metallization can be used, for example, for novel highly reliable assembly and bonding techniques, such as e.g. the copper thick wire bonding, which are used in common power electronic modules application.
Claims (10)
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DE102023202385A1 (en) | 2023-03-16 | 2024-07-18 | Vitesco Technologies Germany Gmbh | Semiconductor switch, power electronics module with a semiconductor switch, power converter with a power electronics module |
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US7470997B2 (en) * | 2003-07-23 | 2008-12-30 | Megica Corporation | Wirebond pad for semiconductor chip or wafer |
DE102006044691B4 (en) * | 2006-09-22 | 2012-06-21 | Infineon Technologies Ag | Method for producing a terminal conductive structure of a component |
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