EP1430524A2 - Method for contacting electrical contact surfaces of a substrate and device consisting of a substrate having electrical contact surfaces - Google Patents
Method for contacting electrical contact surfaces of a substrate and device consisting of a substrate having electrical contact surfacesInfo
- Publication number
- EP1430524A2 EP1430524A2 EP02774408A EP02774408A EP1430524A2 EP 1430524 A2 EP1430524 A2 EP 1430524A2 EP 02774408 A EP02774408 A EP 02774408A EP 02774408 A EP02774408 A EP 02774408A EP 1430524 A2 EP1430524 A2 EP 1430524A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- contact
- substrate
- layer
- semiconductor chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
Definitions
- a mask is applied to the upper surface 301 of the film 3 facing away from the surface 20 of the substrate 1, which mask leaves the contact surfaces 210 and 112 and areas for the conductor tracks 5 free, and then the layer 4 is removed the electrically conductive material is applied to the entire surface of the mask and the contact surfaces 210 and 112 and the areas free of the mask. The mask with the layer 4 located thereon is then removed, so that only the flatly contacted contact surfaces 210 and 112 and the conductor tracks 5 remain on the mask-free regions.
Abstract
The invention relates to a method for contacting electrical contact surfaces (21, 112) on a surface (20) of a substrate (1). According to said method, a film (3) based on polyimide or epoxy is laminated onto the surface, under a vacuum, in such a way that the film closely covers the surface comprising the contact surfaces and adheres to the same. Each contact surface to be contacted on the surface is uncovered by opening respective windows (31) in the film, and a contact is established in a plane manner between each uncovered contact surface and a layer (4) of metal. The inventive method is used to establish a large-surface contact for power semiconductor chips, enabling a high current density.
Description
Beschreibungdescription
Verfahren zum Kontaktieren elektrischer Kontaktflachen eines Substrats und Vorrichtung aus einem Substrat mit elektrischen KontaktflachenMethod for contacting electrical contact surfaces of a substrate and device made of a substrate with electrical contact surfaces
Die Erfindung betrifft ein Verfahren zum Kontaktieren mit einer oder mehreren elektrischen Kontaktflachen auf einer Oberflache eines Substrats und eine Vorrichtung aus einem Substrat mit einer Oberflache, auf der elektrische Kontaktflachen angeordnet sind.The invention relates to a method for contacting one or more electrical contact surfaces on a surface of a substrate and a device comprising a substrate with a surface on which electrical contact surfaces are arranged.
Die am weitesten verbreitete Technologie zur Kontaktierung von Leistungshalbleiterchips untereinander und mit Leiterbahnen ist das Dickdrahtbonden (siehe Harmann, G., „ ire Bonding m Microelectronics, Materials, Processes, Reliability and Yιeldw , Mc Graw Hill 1998). Mittels Ultraschallenergie wird hierbei eine dauerhafte Verbindung zwischen dem Draht aus AI, der einen Durchmesser von typischerweise einigen 100 μm aufweist und der Kontaktflache, die am Chip aus AI und Cu am Leistungsmodul besteht, über eine intermetallische Verbindung realisiert.The most widespread technology for contacting power semiconductor chips with one another and with conductor tracks is thick wire bonding (see Harmann, G., “ire Bonding m Microelectronics, Materials, Processes, Reliability and Yιeld w , Mc Graw Hill 1998). Ultrasonic energy is used to create a permanent connection between the wire made of Al, which typically has a diameter of a few 100 μm, and the contact area, which consists of Al and Cu on the chip on the power module, via an intermetallic connection.
Als Alternativen zum Bonden sind weitere Verfahren wie das ThmPak publiziert (siehe Temple, V., „SPCO' s ThmPakOther methods such as the ThmPak have been published as alternatives to bonding (see Temple, V., "SPCO's ThmPak
Package, an Ideal Block for Power Modules and Power Hybrids*, IMAPS 99 Conference, Chicago 1999) . Hierbei wird die Chipoberflache über ein Lot kontaktiert, das über Locher einer Keramikplatte eingebracht wird.Package, an Ideal Block for Power Modules and Power Hybrids *, IMAPS 99 Conference, Chicago 1999). Here, the chip surface is contacted via a solder that is introduced through holes in a ceramic plate.
Bei MPIPPS (Metal Posts Interconnected Parallel Plate Structures, siehe Haque S., et al . , „An Innovative Technique for Packagmg Power Electronic Building Blocks üsing Metal Posts Interconnected Parallel Plate Struktures", IEEE Trans Adv. Pckag., Vol.22, No.2, May 1999) werden die Kontakte mittels geloteter Kupferpfosten hergestellt.
Eine andere Methode zur Kontaktierung kann über Lotbumps bei der Flip Chip Technologie erfolgen (Liu, X., et al., „Packagmg of Integrated Power Elektronics Modules Using Flip-Chip Technology*, Applied Power Electronics Conference and Exposition, APEC'2000). Diese ermöglicht zudem eine verbesserte Warmeabfuhr, da die Leistungshalbleiter an der Ober- und Unterseite auf DCB-Substraten (DCB steht für Direct Copper Bonding) aufgelotet werden können (siehe Gillot, C, et al . , „A New Packagmg Technique for Power MultiChip Modules*, IEEE Industry Applications Conference IAS'99, 1999) .For MPIPPS (Metal Posts Interconnected Parallel Plate Structures, see Haque S., et al., "An Innovative Technique for Packagmg Power Electronic Building Blocks üsing Metal Posts Interconnected Parallel Plate Structures", IEEE Trans Adv. Pckag., Vol. 22, No .2, May 1999) the contacts are made using soldered copper posts. Another method of contacting can be via solder bumps in flip chip technology (Liu, X., et al., “Packagmg of Integrated Power Electronics Modules Using Flip-Chip Technology *, Applied Power Electronics Conference and Exposition, APEC'2000). This also enables improved heat dissipation, since the power semiconductors can be soldered to the top and bottom of DCB substrates (DCB stands for Direct Copper Bonding) (see Gillot, C, et al., “A New Packaging Technique for Power MultiChip Modules *, IEEE Industry Applications Conference IAS'99, 1999).
Eine großflächige Kontaktierung über aufgedampfte Cu- Leitungen ist m (Lu, G.-Q., „3-D, Bond-Wireless Interconnection of Power Devices m Modules Will CutLarge-area contacting via vapor-deposited copper lines is m (Lu, G.-Q., “3-D, Bond-Wireless Interconnection of Power Devices m Modules Will Cut
Resistance, Parasitics and Noise*, PCIM May 2000, pp.40-68) vorgestellt, wobei die Isolierung der Leiterbahnen mittels aus der Dampfphase abgeschiedenem (CVD-Verfahren) Isolator erfolgt (Power Module Overlay Structure) .Resistance, Parasitics and Noise *, PCIM May 2000, pp.40-68), whereby the conductor tracks are insulated by means of an isolator (CVD process) separated from the vapor phase (Power Module Overlay Structure).
Die Kontaktierung mittels einer strukturierten Folie über einen Klebe- bzw. Lotprozess wurde m (Krokoszmski, H.-J., Esrom, H., „Foil Clip for Power Module Interconnects* , Hybrid Circuits 34, Sept. 1992) publiziert.Contacting by means of a structured film via an adhesive or soldering process was published (Krokoszmski, H.-J., Esrom, H., "Foil Clip for Power Module Interconnects *, Hybrid Circuits 34, Sept. 1992).
Das US-Patent Nr. 5,616,886 von Motorola enthalt einen Vorschlag zum Bondless Module, wobei keine Prozessdetails genannt werden.U.S. Patent No. 5,616,886 to Motorola contains a proposal for bondless modules, with no process details.
Aufgabe der Erfindung ist es, ein Verfahren zum Kontaktieren einer oder mehrerer elektrischer Kontaktflachen auf einer Oberflache eines Substrats bereitzustellen, das gegenüber herkömmlichen derartigen Verfahren den besonderen Vorteil aufweist, der m der Möglichkeit einer großflächigen Kontaktierung, die eine hohe Stromdichte erlaubt, besteht.
Diese Aufgabe wird durch ein Verfahren gelost, das die im Anspruch 1 angegebenen Merkmale aufweist.The object of the invention is to provide a method for contacting one or more electrical contact surfaces on a surface of a substrate, which has the particular advantage over conventional methods of this type that there is the possibility of large-area contacting, which allows a high current density. This object is achieved by a method which has the features specified in claim 1.
Demnach ist durch die erfmdungsgemaße Losung ein Verfahren zum Kontaktieren einer oder mehrerer elektrischer Kontaktflachen auf einer Oberflache eines Substrats bereitgestellt, das die Schritte aufweist:Accordingly, the solution according to the invention provides a method for contacting one or more electrical contact surfaces on a surface of a substrate, which comprises the steps:
- Auflaminieren einer Folie aus elektrisch isolierendem Kunststoffmaterial auf die Oberflache des Substrats unter Vakuum, so dass die Folie die Oberflache mit der oder den Kontaktflachen eng anliegend bedeckt und auf dieser Oberflache haftet,Laminating a film of electrically insulating plastic material onto the surface of the substrate under vacuum, so that the film closely covers the surface with the contact surface (s) and adheres to this surface,
- Freilegen jeder zu kontaktierenden Kontaktflache auf der Oberflache durch Offnen jeweiliger Fenster m der Folie, und - flachiges Kontaktieren jeder freigelegten Kontaktflache mit einer Schicht aus elektrisch leitendem Material.- Expose each contact surface to be contacted on the surface by opening respective windows m of the film, and - Flat contact of each exposed contact surface with a layer of electrically conductive material.
Als Substrate kommen beliebige Schaltungstrager auf organischer oder anorganischer Basis m Frage. Solche Substrate sind beispielsweise PCB (Printed Circuit Board)-, DCB-, IM (Insulated Metal) -, HTCC (High Temperature Cofired Ceramics)- und LTCC (Low Temperature Cofired Ceramics)- Substrate .Arbitrary circuit carriers on an organic or inorganic basis come into question as substrates. Such substrates are, for example, PCB (Printed Circuit Board), DCB, IM (Insulated Metal), HTCC (High Temperature Cofired Ceramics) and LTCC (Low Temperature Cofired Ceramics) substrates.
Das Auflaminieren erfolgt vorteilhaft n einer Vakuumpresse. Dazu sind Vakuumtiefziehen, hydraulisches Vakuumpressen, Vakuumgasdruckpressen oder ahnliche Laminierverfahren denkbar. Der Druck wird vorteilhafterweise isostatisch aufgebracht. Das Auflaminieren erfolgt beispielsweise bei Temperaturen von 100°C bis 250°C und einem Druck von 1 bar bis 10 bar. Die genauen Prozessparameter des Auflammierens, also Druck, Temperatur, Zeit etc., hangen unter anderem von der Topologie des Substrats, des Kunststoffmaterials der Folie und der Dicke der Folie ab.The lamination is advantageously carried out in a vacuum press. Vacuum deep drawing, hydraulic vacuum pressing, vacuum gas pressure pressing or similar lamination processes are also conceivable. The pressure is advantageously applied isostatically. The lamination is carried out, for example, at temperatures from 100 ° C to 250 ° C and a pressure of 1 bar to 10 bar. The exact process parameters of lamination, i.e. pressure, temperature, time etc., depend, among other things, on the topology of the substrate, the plastic material of the film and the thickness of the film.
Zum flächigen Kontaktieren wird vorteilhaft ein physikalisches oder chemisches Abscheiden des elektrisch
leitenden Materials durchgeführt. Derartige physikalische Verfahren sind Sputtern und Bedampfen (Physical Vapor Deposition, PVD) . Das chemische Abscheiden kann aus gasformiger Phase (Chemical Vapor Deposition, CVD) und/oder flussiger Phase (Liquid Phase Chemical Vapor Deposition) erfolgen. Denkbar ist auch, dass zunächst durch eines dieser Verfahren eine dünne elektrisch leitende Teilschicht aufgetragen wird, auf der dann eine dickere elektrisch leitende Teilschicht galvanisch abgeschieden wird.For flat contact, physical or chemical deposition of the electrical is advantageous conducting material. Such physical processes are sputtering and vapor deposition (Physical Vapor Deposition, PVD). Chemical deposition can take place from the gaseous phase (Chemical Vapor Deposition, CVD) and / or the liquid phase (Liquid Phase Chemical Vapor Deposition). It is also conceivable that a thin electrically conductive partial layer is first applied by means of one of these methods, on which a thicker electrically conductive partial layer is then electrodeposited.
Vorzugs- und vorteilhafterweise wird bei dem erfmdungsgemaßen Verfahren ein Substrat mit einer Oberflache verwendet, die mit einem oder mehreren Halbleiterchips, insbesondere Leistungshalbleiterchips bestuckt ist, auf deren jedem je eine oder mehrere zu kontaktierende Kontaktflachen vorhanden ist oder sind, und wobei die Folie auf dieser Oberflache unter Vakuum auflaminiert wird, so dass die Folie diese Oberflache einschließlich jedes Halbleiterchips und jeder Kontaktflache eng anliegend bedeckt und auf dieser Oberflache einschließlich jedes Halbleiterchips haftet.Preferably and advantageously, in the method according to the invention, a substrate is used with a surface which is equipped with one or more semiconductor chips, in particular power semiconductor chips, on each of which there is or are one or more contact surfaces to be contacted, and the film on this surface is laminated under vacuum so that the film closely covers this surface including each semiconductor chip and each contact surface and adheres to this surface including each semiconductor chip.
Die Folie ist dabei so gestaltet, dass ein Höhenunterschied von bis zu 500 μm überwunden werden kann. Der Höhenunterschied ist unter anderem durch die Topologie des Substrats und durch die auf dem Substrat angeordneten Halbleiterchips verursacht.The film is designed so that a height difference of up to 500 μm can be overcome. The height difference is caused, among other things, by the topology of the substrate and by the semiconductor chips arranged on the substrate.
Die Folie kann aus beliebigen Thermoplasten, Duroplasten und Mischungen davon bestehen. Als Folie wird bei dem erfmdungsgemaßen Verfahren Vorzugs- und vorteilhafterweise eine Folie aus einem Kunststoffmateπal auf Polyimid (PI)-, Polyethylen (PE)-, Polyphenol-, Polyetheretherketon (PEEK)- und/oder Epoxidbasis verwendet. Die Folie kann dabei zur Verbesserung der Haftung auf der Oberflache eine Klebebeschichtung aufweisen.
Die Dicke der Folie kann 10 μm bis 500 μm betragen. Vorzugsund vorteilhafterweise wird bei dem erfmdungsgemaßen Verfahren eine auflaminierte Folie einer Dicke von 25 bis 150 μm verwendet.The film can consist of any thermoplastics, thermosets and mixtures thereof. In the process according to the invention, the film is preferably and advantageously a film made from a plastic material based on polyimide (PI), polyethylene (PE), polyphenol, polyether ether ketone (PEEK) and / or epoxy. The film can have an adhesive coating to improve the adhesion to the surface. The thickness of the film can be 10 μm to 500 μm. A laminated film with a thickness of 25 to 150 μm is preferably and advantageously used in the method according to the invention.
Nach dem Auflaminieren wird insbesondere ein Temperschritt durchgeführt. Durch eine Temperaturbehandlung die Haftung der Folie auf der Oberflache verbessert.After lamination, a tempering step is carried out in particular. The adhesion of the film to the surface is improved by a temperature treatment.
In einer weiteren Ausgestaltung wird das Auflaminieren (mit oder ohne Temperschritt) sooft wiederholt wird, bis eine bestimmte Dicke der auflaminierten Folie erreicht ist. Beispielsweise werden Folien geringerer Dicke zu einer auflaminierten Folie höherer Dicke verarbeitet. Diese Folien bestehen vorteilhaft aus einer Art Kunststoffmaterial. Denkbar ist dabei auch, dass Folien aus mehreren unterschiedlichen Kunststoffmaterialen bestehen. Es resultiert eine schichtformige, auflaminierte Folie.In a further embodiment, the lamination (with or without annealing step) is repeated until a certain thickness of the laminated film is reached. For example, films of smaller thickness are processed to a laminated film of higher thickness. These foils advantageously consist of a kind of plastic material. It is also conceivable that foils consist of several different plastic materials. The result is a layered, laminated film.
In einer besonderen Ausgestaltung wird ein Fenster in der Folie durch Laserablation geöffnet. Eine Wellenlange eines dazu verwendeten Lasers betragt zwischen 300 nm und 1100 nm. Die Leistung des Lasers betragt zwischen 1 W und 100 W. Beispielsweise wird ein C02-Laser mit einer Wellenlange von 924 nm verwendet. Das Offnen der Fenster erfolgt dabei ohne eine Beschädigung eines eventuell unter der Folie liegenden Chipkontakts aus Aluminium.In a special embodiment, a window in the film is opened by laser ablation. A wavelength of a laser used for this is between 300 nm and 1100 nm. The power of the laser is between 1 W and 100 W. For example, a CO 2 laser with a wavelength of 924 nm is used. The windows are opened without damaging an aluminum chip contact that may be under the film.
In einer weiteren Ausgestaltung wird eine fotoempf dliche Folie (Fotofolie) verwendet und ein Fenster durch einen fotolithographischen Prozess geöffnet. Der fotolithographische Prozess umfasst ein Belichten der fotoempfmdlichen Folie, ein Entwickeln der belichteten und/oder nicht-belichteten Stellen der Folie und ein Entfernen der belichteten oder nicht-belichteten Stellen der Folie.
Nach dem Offnen der Fenster erfolgt gegebenenfalls ein Reinigungsschritt, bei dem Folienreste entfernt werden. Der Reinigungsschritt erfolgt beispielsweise nasschemisch. Denkbar ist insbesondere auch ein Plasmareinigungsverfahren.In a further embodiment, a photosensitive film (photo film) is used and a window is opened by a photolithographic process. The photolithographic process includes exposing the photosensitive film, developing the exposed and / or unexposed areas of the film, and removing the exposed or unexposed areas of the film. After opening the window, there may be a cleaning step in which film residues are removed. The cleaning step is carried out, for example, using wet chemistry. A plasma cleaning process is also particularly conceivable.
In einer weitere Ausgestaltung wird eine Schicht aus mehreren übereinander angeordneten Teilschichten aus unterschiedlichem, elektrisch leitenden Material verwendet. Es werden beispielsweise verschiedene Metalllagen übereinander aufgetragen. Die Anzahl der Teilschichten beziehungsweise Metalllagen betragt insbesondere 2 bis 5. Durch die aus mehreren Teilschichten aufgebaute elektrisch leitende Schicht kann beispielsweise eine als Diffusionsbamere fungierende Teilschicht integriert sein. Eine derartige Teilschicht besteht beispielsweise aus einer Titan-Wolfram-Legierung (TiW) . Vorteilhafterweise wird bei einem mehrschichtigen Aufbau direkt auf der zu kontaktierenden Oberflache eine die Haftung vermittelnde oder verbessernde Teilschicht aufgebracht. Ein derartige Teilschicht besteht beispielsweise aus Titan.In a further embodiment, a layer composed of a plurality of partial layers of different, electrically conductive material arranged one above the other is used. For example, different metal layers are applied one above the other. The number of partial layers or metal layers is, in particular, 2 to 5. The electrically conductive layer composed of several partial layers can, for example, integrate a partial layer that functions as a diffusion camera. Such a partial layer consists, for example, of a titanium-tungsten alloy (TiW). In the case of a multi-layer structure, a partial layer that promotes or improves adhesion is advantageously applied directly to the surface to be contacted. Such a partial layer consists for example of titanium.
In einer besonderen Ausgestaltung wird nach dem flachigen Kontaktieren m und/oder auf der Schicht aus dem elektrisch leitendem Material mindestens eine Leiterbahn erzeugt. Die Leiterbahn kann auf der Schicht aufgetragen werden. Insbesondere wird zum Erzeugen der Leiterbahn ein Strukturieren der Schicht durchgeführt. Dies bedeutet, dass die Leiterbahn m dieser Schicht erzeugt wird. Die Leiterbahn dient beispielsweise der elektrischen Kontaktierung eines Halbleiterchips.In a special embodiment, at least one conductor track is produced after the flat contact m and / or on the layer of the electrically conductive material. The conductor track can be applied to the layer. In particular, the layer is structured to produce the conductor track. This means that the conductor track is generated in this layer. The conductor track is used, for example, to make electrical contact with a semiconductor chip.
Das Strukturieren erfolgt üblicherweise in einem fotolithographischen Prozess. Dazu kann auf der elektrisch leitenden Schicht ein Fotolack aufgetragen, getrocknet und anschließend belichtet und entwickelt werden. Unter Umstanden folgt ein Temperschritt, um den aufgetragenen Fotolack gegenüber nachfolgenden Behandlungsprozessen zu
stabilisieren. Als Fotolack kommen herkömmliche positive und negative Resists (Beschichtungsmaterialien) in Frage. Das Auftragen des Fotolacks erfolgt beispielsweise durch einen Sprüh- oder Tauchprozess . Electro-Deposition (elektrostatisches oder elektrophoretisches Abscheiden) ist ebenfalls denkbar.The structuring is usually carried out in a photolithographic process. For this purpose, a photoresist can be applied to the electrically conductive layer, dried and then exposed and developed. A tempering step may follow in order to apply the applied photoresist to subsequent treatment processes stabilize. Conventional positive and negative resists (coating materials) can be used as photoresist. The photo lacquer is applied, for example, by a spraying or dipping process. Electro-deposition (electrostatic or electrophoretic deposition) is also conceivable.
Zum Strukturieren können auch fotoempfmdliche Folien eingesetzt werden, die auflamimert und vergleichbar mit dem aufgetragenen Fotolackschicht belichtet und entwickelt werden.For structuring, photo-sensitive foils can also be used, which are laminated on and exposed and developed in a manner comparable to the applied photoresist layer.
Zum Erzeugen der Leiterbahn kann beispielsweise wie folgt vorgegangen werden: In einem ersten Teilschritt wird die elektrisch leitende Schicht strukturiert und in einem darauf folgendem Teilschritt wird auf den erzeugten Leiterbahn eine weitere Metallisierung aufgebracht. Durch die weitere Metallisierung wird die Leiterbahn verstärkt. Beispielsweise wird auf den durch Strukturieren erzeugten Leiterbahn Kupfer galvanisch einer Dicke von 1 μm bis 400 μm abgeschieden. Danach wird die Fotolackschicht beziehungsweise die auflaminierte Folie abgelöst. Dies gelingt beispielsweise mit einem organischen Losungsmittel, einem alkalischen Entwickler oder dergleichen. Durch nachfolgendes Differenzatzen wird die flächige, nicht mit der Metallisierung verstärkte, metallisch leitende Schicht wieder entfernt. Die verstärkte Leiterbahn bleibt erhalten.For example, the following can be used to produce the conductor track: in a first sub-step, the electrically conductive layer is structured and in a subsequent sub-step a further metallization is applied to the conductor track produced. The conductor track is reinforced by the further metallization. For example, copper is electrodeposited to a thickness of 1 μm to 400 μm on the conductor track generated by structuring. The photoresist layer or the laminated film is then removed. This can be done, for example, with an organic solvent, an alkaline developer or the like. Subsequent differential etching removes the flat, metallically conductive layer that is not reinforced with the metallization. The reinforced conductor track is retained.
In einer besonderen Ausgestaltung werden zum Herstellen einer mehrlagigen Vorrichtung die Schritte Auflaminieren,In a special embodiment, the steps of laminating on to produce a multilayer device,
Freilegen, Kontaktieren und Erzeugen der Leiterbahn mehrmals durchgeführt .Exposing, contacting and creating the conductor track carried out several times.
Durch die Erfindung ist vorteilhafterweise eine neuartige Technologie zur elektrischen Kontaktierung und Verdrahtung von Anschlusspads bzw. -kontaktflachen, die auf Halbleiterchips, insbesondere auf Leistungshalbleiterchips
angeordnet sind, bereitgestellt. Zusätzlich ergibt bei dem erf dungsgemaßen Verfahren die flachige Anbmdung und die besondere Isolierung eine niederinduktive Verbindung, um schnelles und verlustarmes Schalten zu ermöglichen.The invention advantageously provides a novel technology for the electrical contacting and wiring of connection pads or contact areas, which are based on semiconductor chips, in particular on power semiconductor chips are arranged, provided. In addition, in the method according to the invention, the flat mounting and the special insulation result in a low-inductance connection in order to enable fast and low-loss switching.
Das Auflaminieren der Folie unter Vakuum bei dem erf dungsgemaßen Verfahren ist durch ein isostatisches Laminieren gegeben. Durch das Auflaminieren der Folie wird eine elektrische Isolationsschicht hergestellt. Die Herstellung der Isolationsschicht durch das erfmdungsgemaße Auflaminieren der Folie bietet folgende Vorteile:The film is laminated under vacuum in the process according to the invention by isostatic lamination. By laminating the film, an electrical insulation layer is created. The production of the insulation layer by laminating the film according to the invention offers the following advantages:
- Anwendung bei hohen Temperaturen. Eine Folie aus Polyimid beispielsweise ist bestandig bis zu 300°C.- Use at high temperatures. For example, a polyimide film is resistant up to 300 ° C.
- Geringe Prozesskosten, z.B. im Vergleich mit Abscheidung des Isolators aus der Dampfphase.- Low process costs, e.g. compared to separating the isolator from the vapor phase.
- Es sind hohe Isolationsfeidstarken durch Verwendung dicker Isolationslagen möglich.- High insulation fields are possible by using thick insulation layers.
- Hoher Durchsatz, z.B. können DCB-Substrate im Nutzen prozessiert werden. - Homogene Isolationseigenschaften, da Luftemschlusse durch die Verarbeitung der Folie im Vakuum verhindert werden.- high throughput, e.g. DCB substrates can be processed in the benefit. - Homogeneous insulation properties, as air pockets are prevented by processing the film in a vacuum.
- Die gesamte Chipkontaktflache kann genutzt werden, so dass hohe Strome abgeleitet werden können. Dabei können Chipkontaktflachen von 60 mm2 bis 100 mm2 realisiert werden. - Durch die flachige Kontaktierung können die Chips homogen angesteuert werden.- The entire chip contact area can be used so that high currents can be derived. Chip contact areas of 60 mm 2 to 100 mm 2 can be realized. - Due to the flat contact, the chips can be controlled homogeneously.
- Die Induktivität des Kontaktes bei einer Kontaktflache ist durch die flachenhafte Geometrie kleiner als beim Dickdrahtbonden . - Die Kontaktierung fuhrt zu hoher Zuverlässigkeit bei Vibrations- und mechanischer Schockbelastung.- Höhere Lastwechselfestigkeit im Vergleich zu konkurrierenden Methoden wegen geringer thermomechanischer Spannungen.- The inductance of the contact with a contact surface is smaller than with thick wire bonding due to the flat geometry. - The contact leads to high reliability in the case of vibration and mechanical shock loads. - Higher fatigue strength compared to competing methods due to lower thermomechanical stresses.
- Es sind mehrere Verdrahtungsebenen zuganglich. - Die beschriebene, planare Verbindungstechnik beansprucht eine geringe Bauhohe. Es resultiert ein kompakter Aufbau.
- Bei mehrlagigen Verbindungsebenen sind großflächige Metallisierungslagen zur Abschirmung realisierbar. Dies wirkt sich insbesondere auf das EMV (Elektromagnetische Verträglichkeit) -Verhalten der Schaltung (Storemission, Storfestigkeit) sehr positiv aus.- Several wiring levels are accessible. - The described, planar connection technology requires a low overall height. The result is a compact structure. - With multi-layer connection levels, large-area metallization layers can be implemented for shielding. This has a particularly positive effect on the EMC (electromagnetic compatibility) behavior of the circuit (interference emissions, interference immunity).
Durch die Erfindung ist auch eine Vorrichtung bereitgestellt, welche die im Anspruch 13 angegebenen Merkmale aufweist und die dem gemäß eine Vorrichtung aus einem Substrat mit einer Oberflache ist, auf der elektrische Kontaktflachen angeordnet sind, wobei auf der Oberflache eine Folie aus elektrisch isolierendem Material durch Vakuum auflaminiert ist, die eng an der Oberflache anliegt und an der Oberflache haftet, wobei die Folie bei jeder Kontaktflache ein Fenster aufweist, in welchem diese Kontaktflache frei von der Folie und flachig mit einer Schicht aus elektrisch leitendem Material kontaktiert ist.The invention also provides a device which has the features specified in claim 13 and which is accordingly a device made of a substrate with a surface on which electrical contact surfaces are arranged, a film made of electrically insulating material by vacuum on the surface is laminated on, which lies close to the surface and adheres to the surface, the film having a window in each contact surface in which this contact surface is free of the film and is contacted flat with a layer of electrically conductive material.
Bevorzugte und vorteilhafte Ausgestaltungen der Vorrichtung nach Anspruch 13 sind m den Ansprüchen 14 und 15 angegeben.Preferred and advantageous embodiments of the device according to claim 13 are specified in claims 14 and 15.
Die Erfindung wird m der nachfolgenden Beschreibung anhand mehrerer Figuren beispielhaft naher erläutert.The invention is explained in more detail by way of example in the following description with reference to several figures.
Figur 1 zeigt einen vertikalen Schnitt durch ein Beispiel einer erf dungsgemaßen Vorrichtung.Figure 1 shows a vertical section through an example of an inventive device.
Figur 2 zeigt schematisch ein Beispiel eines erfmdungsgemaßen Verfahrens.Figure 2 shows schematically an example of a method according to the invention.
In der Figur 1 ist das Substrat des Beispiels generell mit 1 bezeichnet. Dieses Substrat 1 weist beispielsweise ein DCB- Substrat auf, das bekanntermaßen aus einer Schicht 10 aus Keramikmaterial, einer auf eine untere Oberflache 102 der Schicht 10 aufgebrachten Schicht 12 aus Kupfer und einer auf einer von der unteren Oberflache 102 abgekehrten Oberflache 101 der Schicht 10 aufgebrachten Schicht 11 aus Kupfer besteht.
Die Schicht 11 auf der oberen Oberflache 101 der Schicht 10 ist bereichsweise bis auf die obere Oberflache 101 herab entfernt, so dass dort die obere Oberflache 101 frei liegt, jedoch hat dies für die Erfindung keine Bedeutung.The substrate of the example is generally designated 1 in FIG. This substrate 1 has, for example, a DCB substrate, which is known to consist of a layer 10 of ceramic material, a layer 12 of copper applied to a lower surface 102 of the layer 10 and a surface 101 of the layer 10 facing away from the lower surface 102 Layer 11 consists of copper. The layer 11 on the upper surface 101 of the layer 10 is partially removed down to the upper surface 101, so that the upper surface 101 is exposed there, but this is of no significance for the invention.
Auf die von der Schicht 10 abgekehrte Oberflache 111 der verbliebenen Schicht 11 aus Kupfer sind Halbleiterchips 2 aufgebracht, die zueinander gleich und/oder voneinander verschieden sein können.Semiconductor chips 2 are applied to the surface 111 facing away from the layer 10 of the remaining layer 11 of copper, which chips may be identical to and / or different from one another.
Jeder Halbleiterchip 2, der vorzugsweise ein Leistungshalbleiterchip ist, kontaktiert mit einer nicht dargestellten Kontaktflache, die auf einer der Schicht 11 aus Kupfer zugekehrten unteren Oberflache 202 des Chips 2 vorhanden ist, flachig die obere Oberflache 111 der Schicht 11. Beispielsweise ist diese Kontaktflache mit der Schicht 11 verlotet .Each semiconductor chip 2, which is preferably a power semiconductor chip, makes contact with a contact surface, not shown, which is present on a lower surface 202 of the chip 2 facing the layer 11 of copper, flatly the upper surface 111 of the layer 11. For example, this contact surface is with the Layer 11 soldered.
Auf der von der Schicht 11 aus Kupfer und der unterenOn the layer 11 of copper and the lower one
Oberflache 202 abgekehrten oberen Oberflache 201 jedes Chip 2 ist je ein Kontakt 21 mit einer vom Chip 2 abgekehrten Kontaktflache 210 vorhanden.Surface 202 facing away from the upper surface 201 of each chip 2 there is a contact 21 with a contact surface 210 facing away from the chip 2.
Ist beispielsweise der Halbleiterchip 2 ein Transistor, ist die Kontaktflache auf der unteren Oberflache 202 dieses Chips 2 die Kontaktflache eines Kollektor- bzw. Drainkontaktes, und ist der Kontakt 21 auf der oberen Oberflache 201 des Chip 2 ein Emitter- bzw. Sourcekontakt, dessen Kontaktflache die Kontaktflache 210 ist.For example, if the semiconductor chip 2 is a transistor, the contact area on the lower surface 202 of this chip 2 is the contact area of a collector or drain contact, and the contact 21 on the upper surface 201 of the chip 2 is an emitter or source contact, the contact area of which the contact area is 210.
Die generell mit 20 bezeichnete gesamte obere Oberflache des mit den Halbleiterchips 2 bestuckten Substrats 1 ist durch die freiliegenden Teile der oberen Oberflache 101 der Schicht 10, der oberen Oberflache 101 der Schicht 11 aus Kupfer außerhalb der Chips 2 und durch die freie Oberflache jedes
Chip 2 selbst gegeben, die durch die obere Oberfläche 201 und die seitliche Oberflache 203 dieses Chip 2 bestimmt ist.The total upper surface, generally designated 20, of the substrate 1 populated with the semiconductor chips 2 is due to the exposed parts of the upper surface 101 of the layer 10, the upper surface 101 of the layer 11 made of copper outside the chips 2 and due to the free surface of each Given chip 2 itself, which is determined by the upper surface 201 and the side surface 203 of this chip 2.
Die Oberflache 20 des Substrats 1 ist die für die Erfindung relevante Oberflache.The surface 20 of the substrate 1 is the surface relevant for the invention.
Erfmdungsgemaß wird auf die Oberflache 20 des Substrats 1 eine Folie 3 aus elektrisch isolierendem Kunststoffmaterial unter Vakuum auflammiert, so dass die Folie 3 die Oberflache 20 mit den Kontaktflachen 210 eng anliegend bedeckt und auf dieser Oberflache 20 haftet (Figur 2, 301) .According to the invention, a film 3 made of electrically insulating plastic material is laminated onto the surface 20 of the substrate 1 under vacuum, so that the film 3 closely covers the surface 20 with the contact surfaces 210 and adheres to this surface 20 (FIGS. 2, 301).
Die auflaminierte Folie 3 dient als Isolator und als Trager von Leiterbahnen 5.The laminated film 3 serves as an insulator and as a carrier for conductor tracks 5.
Die Folie 3 besteht aus einem Kunststoffmaterial auf Polyimid- oder Epoxidbasis.The film 3 consists of a plastic material based on polyimide or epoxy.
Zur besseren Haftung kann ein Temperschritt nachfolgen. Typische Dicken d der Folie 3 liegen im Bereich von 25-150 μm, wobei größere Dicken auch aus Schichtenfolgen von dünneren Folien 3 erreicht werden können. Damit lassen sich vorteilhafterweise Isolationsfeldstarken im kV-Bereich realisieren .A tempering step can follow for better adhesion. Typical thicknesses d of the film 3 are in the range of 25-150 μm, and larger thicknesses can also be achieved from layer sequences of thinner films 3. In this way, isolation field strengths in the kV range can advantageously be realized.
Nun wird jede zu kontaktierende Kontaktflache auf der Oberflache 20 des Substrats 1 durch Offnen jeweiliger Fenster 31 m der Folie 3 freigelegt (Figur 2, 302) .Each contact surface to be contacted is now exposed on the surface 20 of the substrate 1 by opening respective windows 31 m of the film 3 (FIGS. 2, 302).
Eine zu kontaktierende Kontaktflache ist nicht nur eineA contact surface to be contacted is not just one
Kontaktflache 210 auf einem Halbleiterchip 2, sondern kann auch jeder durch Offnen eines Fensters 31 in der Folie 3 freigelegter Bereich 112 der oberen Oberflache 111 der Schicht 11 aus Kupfer oder einem sonstigen Metall sein.Contact surface 210 on a semiconductor chip 2, but can also be any region 112 of the upper surface 111 of the layer 11 made of copper or another metal which is exposed in the film 3 by opening a window 31.
Das Offnen eines Fensters 31 der Folie 3 wird vorzugsweise durch Laserablation vorgenommen.
Danach wird jede freigelegte Kontaktflache 210 und 112 mit einer Schicht 4 aus elektrisch leitendem Material, vorzugsweise Metall, flachig kontaktiert, indem die freigelegten Kontaktflachen 210 und 112 mit den üblichen Verfahren metallisiert und strukturiert und somit planar kontaktiert werden (Figur 2, 303) .A window 31 of the film 3 is preferably opened by laser ablation. Each exposed contact area 210 and 112 is then contacted flat with a layer 4 of electrically conductive material, preferably metal, by metallizing and structuring the exposed contact areas 210 and 112 using the usual methods and thus making contact in a planar manner (FIGS. 2, 303).
Beispielsweise kann die Schicht 4 ganzflachig sowohl auf jede Kontaktflache 210 und 112 als auch auf die von der Oberflache 20 des Substrats 1 abgekehrte obere Oberflache 301 der Folie 3 aufgebracht und danach beispielsweise fotolithographisch so strukturiert werden, dass jede Kontaktflache 210 und 112 flachig kontaktiert bleibt und außerhalb der Kontaktflachen 210und 112 Leiterbahnen 5 entstehenFor example, the layer 4 can be applied over the entire surface both to each contact surface 210 and 112 and also to the upper surface 301 of the film 3 facing away from the surface 20 of the substrate 1 and can then, for example, be structured photolithographically in such a way that each contact surface 210 and 112 remains in flat contact and conductor tracks 5 are formed outside the contact areas 210 and 112
Vorzugsweise werden dazu folgende Prozessschritte (semiadditiver Aufbau) durchgeführt:The following process steps (semi-additive structure) are preferably carried out:
l) Sputtern einer Ti-Haftschicht von ca. 100 nm Dicke und einer Cu-Leitschicht 4 von ca. 200 nm Dicke (Figur 2, 303).l) Sputtering a Ti adhesive layer of approximately 100 nm in thickness and a Cu conductive layer 4 of approximately 200 nm in thickness (FIGS. 2, 303).
n). Fotolithographie unter Verwendung dicker Lackschichten oder von Fotofolien 7 (Figur 2, 304)n). Photolithography using thick layers of lacquer or photo films 7 (FIGS. 2, 304)
m) . Galvanische Verstärkung der freientwickelten Bereiche mit elektrisch leitender Schicht 6. Hier sind Schichtdicken bis 500 μm möglich (Figur 2, 305) .m). Galvanic reinforcement of the freely developed areas with electrically conductive layer 6. Layer thicknesses of up to 500 μm are possible (FIGS. 2, 305).
IV) . Lackentschichtung und Differenzatzen von Cu und Ti (Figur 2, 306) .IV). Paint stripping and differential etching of Cu and Ti (Figure 2, 306).
Es kann auch so vorgegangen werden, dass auf die von der Oberflache 20 des Substrats 1 abgekehrte obere Oberflache 301 der Folie 3 eine Maske aufgebracht wird, welche die Kontaktflachen 210 und 112 sowie Bereiche für die Leiterbahnen 5 freilasst, und dass dann die Schicht 4 aus dem
elektrisch leitenden Material ganzflachig auf die Maske und die Kontaktflachen 210 und 112 sowie die von der Maske freien Bereiche aufgebracht wird. Danach wird die Maske mit der darauf befindlichen Schicht 4 entfernt, so dass nur die flachig kontaktierten Kontaktflachen 210 und 112 und die Leiterbahnen 5 auf den maskenfreien Bereichen übrigbleiben.It can also be done in such a way that a mask is applied to the upper surface 301 of the film 3 facing away from the surface 20 of the substrate 1, which mask leaves the contact surfaces 210 and 112 and areas for the conductor tracks 5 free, and then the layer 4 is removed the electrically conductive material is applied to the entire surface of the mask and the contact surfaces 210 and 112 and the areas free of the mask. The mask with the layer 4 located thereon is then removed, so that only the flatly contacted contact surfaces 210 and 112 and the conductor tracks 5 remain on the mask-free regions.
Jedenfalls ist danach eine Vorrichtung aus einem Substrat 1 mit einer Oberflache 20, auf der elektrische Kontaktflachen 210, 112 angeordnet sind, bereitgestellt, bei der auf der Oberflache 20 ein Isolator in Form einer Folie 3 aus elektrisch isolierendem Material durch Vakuum auflaminiert ist, die eng an der Oberflache 20 anliegt und an der Oberflache 20 haftet und bei der die Folie 3 bei jeder Kontaktflache 210 und 112 ein Fenster 31 aufweist, in welchem diese Kontaktflache 210, 112 frei von der Folie 3 und flachig mit einer Schicht 4 und zusatzlich mit einer Schicht 6 aus elektrisch leitendem Material kontaktiert ist. Spezielle Ausbildungen dieser Vorrichtung ergeben sich aus der vorstehenden Beschreibung.
In any case, a device is then provided from a substrate 1 with a surface 20 on which electrical contact surfaces 210, 112 are arranged, in which an insulator in the form of a film 3 made of electrically insulating material is laminated onto the surface 20 by vacuum, which is narrow bears against the surface 20 and adheres to the surface 20 and in which the film 3 has a window 31 in each contact surface 210 and 112, in which this contact surface 210, 112 is free of the film 3 and flat with a layer 4 and additionally with a Layer 6 made of electrically conductive material is contacted. Special designs of this device result from the above description.
Claims
1. Verfahren zum Kontaktieren einer oder mehrerer elektrischer Kontaktflachen (21) auf einer Oberflache (20) eines Substrats (1), mit den Schritten:1. A method for contacting one or more electrical contact surfaces (21) on a surface (20) of a substrate (1), comprising the steps:
- Auflaminieren einer Folie (3) aus elektrisch isolierendem Kunststoffmaterial auf die Oberflache (20) des Substrats (1) unter Vakuum, so dass die Folie (3) die Oberflache (20) mit der oder den Kontaktflachen (210, 112) eng anliegend bedeckt und auf dieser Oberflache (20) haftet,- Laminating a film (3) made of electrically insulating plastic material onto the surface (20) of the substrate (1) under vacuum, so that the film (3) covers the surface (20) with the contact surface (s) (210, 112) closely and adheres to this surface (20),
- Freilegen jeder zu kontaktierenden Kontaktflache (210, 112) auf der Oberflache (20) durch Offnen jeweiliger Fenster (31) in der Folie (3), und- Expose each contact surface (210, 112) to be contacted on the surface (20) by opening respective windows (31) in the film (3), and
- flächiges Kontaktieren jeder freigelegten Kontaktflache (210, 112) mit einer Schicht (4, 6) aus elektrisch leitendem Material .- Flat contacting of each exposed contact surface (210, 112) with a layer (4, 6) made of electrically conductive material.
2. Verfahren nach Anspruch 1, wobei ein Substrat (1) mit einer Oberflache (20) verwendet wird, die mit einem oder mehreren Halbleiterchips (2) bestuckt ist, auf deren jedem je eine oder mehrere zu kontaktierende Kontaktflachen (210) vorhanden ist oder sind, und wobei die Folie (3) auf diese Oberflache (20) unter Vakuum auflamimert wird, so dass die Folie (3) diese Oberflache (20) einschließlich jedes Halbleiterchips (2) und jeder Kontaktflache eng anliegend bedeckt und auf dieser Oberflache (20) einschließlich jedes Halbleiterchips (2) haftet.2. The method according to claim 1, wherein a substrate (1) is used with a surface (20) which is equipped with one or more semiconductor chips (2), on each of which one or more contact surfaces (210) to be contacted is present or and the film (3) is laminated onto this surface (20) under vacuum, so that the film (3) covers this surface (20) including each semiconductor chip (2) and each contact surface in close contact and on this surface (20 ) including each semiconductor chip (2) is liable.
3. Verfahren nach Anspruch 2, wobei ein Substrat (1) mit einer mit einem oder mehreren Leistungshalbleiterchips (2) bestuckten Oberflache (20) verwendet wird.3. The method according to claim 2, wherein a substrate (1) with a surface (20) populated with one or more power semiconductor chips (2) is used.
4. Verfahren nach einem der vorhergehenden Ansprüche, wobei eine Folie (3) aus einem Kunststoffmaterial auf Polyimid-, Polyethylen-, Polyphenol-, Polyetheretherketon- und/oder auf Epoxidbasis verwendet wird. 4. The method according to any one of the preceding claims, wherein a film (3) made of a plastic material based on polyimide, polyethylene, polyphenol, polyetheretherketone and / or on epoxy is used.
5. Verfahren nach einem der vorhergehenden Ansprüche, wobei eine auflaminierte Folie (3) mit einer Dicke (d) von 25 bis 150 μm verwendet wird.5. The method according to any one of the preceding claims, wherein a laminated film (3) with a thickness (d) of 25 to 150 microns is used.
6. Verfahren nach einem der vorhergehenden Ansprüche, wobei nach dem Auflaminieren der Folie (3) ein Temperschritt durchgeführt wird.6. The method according to any one of the preceding claims, wherein after the lamination of the film (3) a tempering step is carried out.
7. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Auflamimeren sooft wiederholt wird, bis eine bestimmte7. The method according to any one of the preceding claims, wherein the Auflamimeren is repeated until a certain one
Dicke der auflaminierten Folie erreicht ist.Thickness of the laminated film is reached.
8. Verfahren nach einem der vorhergehenden Ansprüche, wobei ein Fenster (31) m der Folie (3) durch Laserablation geöffnet wird.8. The method according to any one of the preceding claims, wherein a window (31) m of the film (3) is opened by laser ablation.
9. Verfahren nach einem der vorhergehenden Ansprüche, wobei eine fotoempfindliche Folie (3) verwendet wird und ein Fenster (31) durch einen fotolithographischen Prozess geöffnet wird.9. The method according to any one of the preceding claims, wherein a photosensitive film (3) is used and a window (31) is opened by a photolithographic process.
10. Verfahren nach einem der vorhergehenden Ansprüche, wobei eine Schicht aus mehreren übereinander angeordneten Teilschichten aus unterschiedlichem, elektrisch leitenden Material verwendet wird.10. The method according to any one of the preceding claims, wherein a layer of several superimposed partial layers of different, electrically conductive material is used.
11. Verfahren nach einem der vorhergehenden Ansprüche, wobei nach dem flächigen Kontaktieren m und/oder auf der Schicht aus dem elektrisch leitendem Material mindestens eine Leiterbahn erzeugt wird.11. The method according to any one of the preceding claims, wherein after the flat contact m and / or on the layer of the electrically conductive material at least one conductor track is generated.
12. Verfahren nach einem der vorhergehenden Ansprüche, wobei zum Herstellen einer mehrlagigen Vorrichtung die Schritte Auflamimeren, Freilegen, Kontaktieren und Erzeugen der Leiterbahn mehrmals durchgeführt wird. 12. The method according to any one of the preceding claims, wherein the steps Auflamimeren, exposing, contacting and generating the conductor track is carried out several times to produce a multilayer device.
13. Vorrichtung aus einem Substrat (1) mit einer Oberflache (20), auf der elektrische Kontaktflachen (210, 112) angeordnet sind, wobei auf der Oberflache (20) eine Folie (3) aus elektrisch isolierendem Material durch Vakuum auflamimert ist, die eng an der Oberflache (20) anliegt und an der Oberflache (20) haftet, wobei die Folie (3) bei jeder Kontaktflache (210, 112) ein Fenster (31) aufweist, in welchem diese Kontaktflache (210, 112) frei von der Folie (3) und flachig mit einer Schicht (4, 6) aus elektrisch leitendem Material kontaktiert ist.13. Device from a substrate (1) with a surface (20) on which electrical contact surfaces (210, 112) are arranged, on the surface (20) a film (3) of electrically insulating material is laminated by vacuum, which fits closely to the surface (20) and adheres to the surface (20), the film (3) having a contact (210, 112) having a window (31) in which this contact surface (210, 112) is free of Foil (3) and flat with a layer (4, 6) made of electrically conductive material is contacted.
14. Vorrichtung nach Anspruch 13, mit zumindest einer Kontaktflache (210) auf wenigstens einem Halbleiterchip (2) auf der Oberflache (20) des Substrats (1), wobei die Folie (3) eng an dem Halbleiterchip (2) anliegt und bei der14. The apparatus of claim 13, with at least one contact surface (210) on at least one semiconductor chip (2) on the surface (20) of the substrate (1), wherein the film (3) lies closely against the semiconductor chip (2) and at
Kontaktflache (210) auf dem Halbleiterchip (2) ein Fenster (31) aufweist, in welchem diese Kontaktflache (210) frei von der Folie (3) und flachig mit einer Schicht (4, 6) aus elektrisch leitendem Material kontaktiert ist.Contact surface (210) on the semiconductor chip (2) has a window (31), in which this contact surface (210) is free of the film (3) and flat with a layer (4, 6) made of electrically conductive material.
15. Vorrichtung nach Anspruch 14, wobei ein Halbleiterchip (2) ein Leistungshalbleiterchip ist. 15. The apparatus of claim 14, wherein a semiconductor chip (2) is a power semiconductor chip.
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DE10147935 | 2001-09-28 | ||
PCT/DE2002/003615 WO2003030247A2 (en) | 2001-09-28 | 2002-09-25 | Method for contacting electrical contact surfaces of a substrate and device consisting of a substrate having electrical contact surfaces |
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US (1) | US7402457B2 (en) |
EP (1) | EP1430524A2 (en) |
JP (1) | JP2005515616A (en) |
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- 2002-09-25 WO PCT/DE2002/003615 patent/WO2003030247A2/en active Application Filing
- 2002-09-25 CN CNA028190637A patent/CN1575511A/en active Pending
- 2002-09-25 JP JP2003533338A patent/JP2005515616A/en active Pending
- 2002-09-25 US US10/491,137 patent/US7402457B2/en not_active Expired - Fee Related
- 2002-09-25 KR KR1020047004531A patent/KR100896906B1/en not_active IP Right Cessation
- 2002-09-25 AU AU2002340750A patent/AU2002340750A1/en not_active Abandoned
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WO2003030247A3 (en) | 2003-10-09 |
US7402457B2 (en) | 2008-07-22 |
WO2003030247A2 (en) | 2003-04-10 |
JP2005515616A (en) | 2005-05-26 |
US20050032347A1 (en) | 2005-02-10 |
KR20040037173A (en) | 2004-05-04 |
KR100896906B1 (en) | 2009-05-12 |
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