DE112014006759T5 - Semiconductor device, method for manufacturing a semiconductor device and power conversion device - Google Patents
Semiconductor device, method for manufacturing a semiconductor device and power conversion device Download PDFInfo
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- DE112014006759T5 DE112014006759T5 DE112014006759.8T DE112014006759T DE112014006759T5 DE 112014006759 T5 DE112014006759 T5 DE 112014006759T5 DE 112014006759 T DE112014006759 T DE 112014006759T DE 112014006759 T5 DE112014006759 T5 DE 112014006759T5
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Abstract
In einer Leistungshalbleitervorrichtung wird eine Beschichtung eines drahtgebondeten Abschnitts mit einem Harz in einer im hohen Grade zuverlässigen und leichten Weise gefördert. Die Halbleitervorrichtung enthält: einen Halbleiter-Chip (12), der so ausgebildet ist, dass er darauf eine Oberflächenelektrode (31) aufweist, um mit Drähten (13) verbunden zu werden; einen ersten Harzfilm (40), der die gebondeten Abschnitte zwischen den Drähten (13) und der Oberflächenelektrode (31) abdeckt; einen zweiten Harzfilm (34), der einen Umfang einer Oberfläche abdeckt, auf der die Oberflächenelektrode (31) ausgebildet ist, sich mit dem ersten Harzfilm (40) in Kontakt befindet und eine Filmdicke aufweist, die größer als die des ersten Harzfilms (40) ist; und ein gelartiges Dichtungsmittel (36), das den Halbleiter-Chip (12), den ersten Harzfilm (40) und den zweiten Harzfilm (34) abdeckt.In a power semiconductor device, coating of a wire-bonded portion with a resin is promoted in a highly reliable and easy manner. The semiconductor device includes: a semiconductor chip (12) formed to have thereon a surface electrode (31) to be connected to wires (13); a first resin film (40) covering the bonded portions between the wires (13) and the surface electrode (31); a second resin film (34) covering a circumference of a surface on which the surface electrode (31) is formed, being in contact with the first resin film (40), and having a film thickness larger than that of the first resin film (40) is; and a gel-like sealant (36) covering the semiconductor chip (12), the first resin film (40) and the second resin film (34).
Description
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung bezieht sich auf eine Halbleitervorrichtung, ein Verfahren zum Herstellen einer Halbleitervorrichtung und eine Leistungsumsetzungsvorrichtung.The present invention relates to a semiconductor device, a method of manufacturing a semiconductor device, and a power conversion device.
TECHNISCHER HINTERGRUNDTECHNICAL BACKGROUND
Ein Leistungshalbleiter wird in einer Leistungsumsetzungsvorrichtung, die durch einen Inverter repräsentiert wird, als eine Hauptkomponente verwendet, die eine Gleichrichtungsfunktion und eine Schaltfunktion aufweist. Als ein Material für einen Leistungshalbleiter ist zusätzlich zu Silicium, das hauptsächlich verwendet wird, zunehmend Siliciumcarbid (SiC) aufgrund seiner hervorragenden physikalischen Materialeigenschaften eingeführt worden.A power semiconductor is used in a power conversion device represented by an inverter as a main component having a rectifying function and a switching function. As a material for a power semiconductor, in addition to silicon mainly used, silicon carbide (SiC) has been increasingly introduced because of its excellent physical material properties.
Verschiedene Leistungshalbleiterzellen sind in Abhängigkeit von der Anwendung einzeln oder in Kombination in Baugruppen angeordnet, um ein Leistungshalbleitermodul zu erzeugen. Ein Silicium-IGBT (ein Silicium-Bipolartransistor mit isoliertem Gate) und eine PN-Diode für den Freilauf werden z. B. im Allgemeinen kombiniert, um ein Modul für eine elektrische Eisenbahn zu erzeugen. Viele der tatsächlichen Modulprodukte sind z. B. in jene klassifiziert, die eine Nennstromkapazität von 600 A bis 1800 A und eine Durchbruchspannung von 1,7 kV bis 6,5 kV aufweisen. Es sind in Abhängigkeit von der Anwendung verschiedene Konfigurationen möglich, um eine Schaltung innerhalb des Moduls zu konfigurieren, einschließlich eines 1-in-1-Typs zum Bilden eines Arms in einem Inverter für eine Phase und eines 2-in-1-Typs zum Integrieren von zwei Armen.Various power semiconductor cells are arranged individually or in combination in assemblies, depending on the application, to produce a power semiconductor module. A silicon IGBT (a silicon insulated gate bipolar transistor) and a PN diode for free-wheeling are disclosed, for example, in US Pat. B. generally combined to produce a module for an electric train. Many of the actual module products are z. B. in those having a rated current capacity of 600 A to 1800 A and a breakdown voltage of 1.7 kV to 6.5 kV. Various configurations are possible depending on the application to configure a circuit within the module, including a 1-in-1 type of forming an arm in a single phase inverter and a 2 in 1 type of integrating from two arms.
Eine interne Struktur dieser Module ist so, dass z. B. ein Leistungsmodul für eine elektrische Eisenbahn, das eine Anwendung mit einer hohen Durchbruchspannung und einer hohen Stromkapazität repräsentiert, mit isolierenden Substraten in einer Baugruppe angeordnet ist, wobei auf jedem davon IGBT-Chips, die parallelgeschaltet sind, um die Stromkapazität zu erhöhen, und Dioden-Chips, die außerdem parallelgeschaltet sind, angebracht sind. Hier werden das Drahtbonden und die Schaltungsverdrahtung auf dem isolierenden Substrat verwendet, um einen IGBT mit einer Freilaufdiode so zu verbinden, dass der IGBT und die Freilaufdiode antiparallel miteinander elektrisch verbunden sind. Jedes isolierende Substrat wird an einer Basisplatte angebracht, die später mit einem Kühlkörper verbunden wird, wobei dann die Hauptanschlüsse und die Hilfsanschlüsse mit ihm verbunden werden. Zusätzlich wird jedes isolierende Substrat durch ein Gehäuse abgedichtet, das eine Struktur des Abdeckens der Oberseite der Basisplatte aufweist, wobei ein Silicongel eingegossen wird, um einen Raum innerhalb des Gehäuses abzudichten.An internal structure of these modules is such that z. For example, a power train for an electric train representing an application having a high breakdown voltage and a high current capacity is arranged with insulating substrates in an assembly, on each of which IGBT chips connected in parallel to increase the current capacity, and Diode chips, which are also connected in parallel, are mounted. Here, the wire bonding and the circuit wiring on the insulating substrate are used to connect an IGBT to a freewheeling diode so that the IGBT and the freewheeling diode are electrically connected in anti-parallel with each other. Each insulating substrate is attached to a base plate, which is later connected to a heat sink, then the main terminals and the auxiliary terminals are connected to it. In addition, each insulating substrate is sealed by a housing having a structure of covering the top of the base plate, wherein a silicone gel is poured to seal a space inside the housing.
In einem Leistungshalbleitermodul variiert die Menge der Wärmeerzeugung aufgrund des Verlusts des Moduls selbst, das die Leistungsumsetzung passiv ausführt, gemäß der Variation der einer Last, wie z. B. einem Motor, zugeführten elektrischen Leistung. Die Zyklen der Wärmeerzeugung und der Abkühlung erzeugen eine Spannung zwischen den Aufbaumaterialien, die verschiedene thermische Ausdehnungskoeffizienten aufweisen, wobei dies zu einer schlechten Zuverlässigkeit aufgrund von Rissen oder des Ablösens einer Verbindung führt. Ein Abschnitt, der besonders dazu neigt, durch die thermische Ausdehnung und Kontraktion zerstört zu werden, ist ein durch Drahtbonden zwischen den Halbleiter-Chip und das Metall gebondeter Abschnitt. Der gebondete Abschnitt wird typischerweise durch Bonden eines Aluminiumdrahts, der einen Durchmesser von etwa einigen hundert Mikrometern aufweist, unter Verwendung einer Ultraschallbondtechnik an einen Aluminiumelektrodenfilm, der eine Dicke von etwa einigen Mikrometern aufweist, auf der Oberfläche des Chips gebildet, so dass sie sich mit der Oberfläche des Chips, wo die Wärme erzeugt wird, in Kontakt befindet und eine maßvolle Flächengröße aufweist, wobei leicht ein Schwachpunkt gebildet wird.In a power semiconductor module, the amount of heat generation varies due to the loss of the module itself, which performs power conversion passively, according to the variation of a load such as a load. As a motor, supplied electrical power. The cycles of heat generation and cooling generate stress between the building materials having different coefficients of thermal expansion, resulting in poor reliability due to cracking or peeling of a joint. A portion particularly prone to be destroyed by the thermal expansion and contraction is a portion bonded by wire bonding between the semiconductor chip and the metal. The bonded portion is typically formed by bonding an aluminum wire having a diameter of about several hundred micrometers to an aluminum electrode film having a thickness of about several microns using an ultrasonic bonding technique on the surface of the chip so as to conform to the Surface of the chip, where the heat is generated, in contact and has a moderate area size, with a weak point is easily formed.
Um dieses Problem zu beseitigen, offenbart das Patentdokument 1 ein Verfahren zum Verstärken eines drahtgebondeten Abschnitts, um die Zuverlässigkeit gegen die Zyklen (die Leistungszyklen) der Wärmeerzeugung und des Abkühlens zu verbessern. Gemäß diesem Dokument wird ein flüssiges Harz verwendet, um den gebondeten Abschnitt zum Verstärken des gebondeten Abschnitts zu beschichten, um die Zuverlässigkeit gegen die Leistungszyklen zu verbessern.In order to eliminate this problem, Patent Document 1 discloses a method for reinforcing a wire-bonded portion to improve the reliability against the cycles (the power cycles) of heat generation and cooling. According to this document, a liquid resin is used to coat the bonded portion for reinforcing the bonded portion to improve the reliability against the performance cycles.
DOKUMENT DES STANDES DER TECHNIKDOCUMENT OF THE PRIOR ART
PatentdokumentPatent document
-
Patentdokument 1:
Japanische Patentveröffentlichung Nr. 2007-12831 Japanese Patent Publication No. 2007-12831
ZUSAMMENFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION
Die zu lösenden ProblemeThe problems to be solved
Gemäß der oben beschriebenen Technik gibt es jedoch ein Problem, dass sich das Harz, das nur in die Umgebung des drahtgebondeten Abschnitts zu tropfen ist, über die Oberseite des Chips ausbreitet und manchmal vom Umfang des Chips überläuft, um eine schlechte Verbindung oder eine schlechte Zuverlässigkeit zu verursachen.According to the technique described above, however, there is a problem that the resin, which is to be dropped only in the vicinity of the wire bonded portion, spreads over the top of the chip and sometimes overflows the periphery of the chip, poor connection or poor reliability to cause.
Die vorliegende Erfindung ist in Anbetracht der obigen Umstände gemacht worden, um eine Halbleitervorrichtung, ein Verfahren zum Herstellen einer Halbleitervorrichtung und eine Leistungsumsetzungsvorrichtung, die die Beschichtung eines drahtgebondeten Abschnitts mit einem Harz in einer im hohen Grade zuverlässigen und leichten Weise fördern, zu schaffen. The present invention has been made in view of the above circumstances to provide a semiconductor device, a method of manufacturing a semiconductor device, and a power conversion device that promote the coating of a wire bonded portion with a resin in a highly reliable and easy manner.
Die Lösung für die ProblemeThe solution to the problems
Um die obigen Probleme zu lösen, enthält eine Halbleitervorrichtung gemäß der vorliegenden Erfindung: einen Halbleiter-Chip, der so ausgebildet ist, dass er darauf eine Oberflächenelektrode aufweist, um mit Drähten verbunden zu werden; einen ersten Harzfilm, der die gebondeten Abschnitte zwischen den Drähten und der Oberflächenelektrode abdeckt; einen zweiten Harzfilm, der einen Umfang einer Oberfläche, auf der die Oberflächenelektrode ausgebildet ist, abdeckt, sich mit dem ersten Harzfilm in Kontakt befindet und eine Filmdicke aufweist, die größer als die des ersten Harzfilms ist; und ein gelähnliches Dichtungsmittel, das den Halbleiter-Chip, den ersten Harzfilm und den zweiten Harzfilm abdeckt.In order to solve the above problems, a semiconductor device according to the present invention includes: a semiconductor chip formed to have thereon a surface electrode to be connected to wires; a first resin film covering the bonded portions between the wires and the surface electrode; a second resin film covering a circumference of a surface on which the surface electrode is formed, being in contact with the first resin film and having a film thickness larger than that of the first resin film; and a gel-like sealant covering the semiconductor chip, the first resin film and the second resin film.
Die vorteilhaften Wirkungen der ErfindungThe beneficial effects of the invention
Gemäß der vorliegenden Erfindung ist der zweite Harzfilm dicker als der erste Harzfilm, um das Beschichten eines drahtgebondeten Abschnitts mit einem Harz in einer im hohen Grade zuverlässigen und leichten Weise zu fördern.According to the present invention, the second resin film is thicker than the first resin film to promote the coating of a wire-bonded portion with a resin in a highly reliable and easy manner.
KURZBESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS
DIE AUSFÜHRUNGSFORMEN DER ERFINDUNGTHE EMBODIMENTS OF THE INVENTION
Die erste AusführungsformThe first embodiment
<Die Konfiguration der ersten Ausführungsform><The Configuration of First Embodiment>
Als Nächstes wird eine Beschreibung der Konfiguration eines Leistungshalbleitermoduls gemäß einer ersten Ausführungsform der vorliegenden Erfindung bezüglich
In
Als Nächstes wird bezüglich
Als Nächstes wird eine Beschreibung einer Verbindung zwischen dem PN-Dioden-Chip
Der PN-Dioden-Chip
Ein Ausbreitungsverhinderungsharz
In der vorliegenden Ausführungsform wird ein Polyamidimidharz als das Drahtverstärkungsharz
Im Gegensatz soll das Ausbreitungsverhinderungsharz
<Der Herstellungsprozess der ersten Ausführungsform><The Production Process of the First Embodiment>
[Das Anbringen des Chips] Als Nächstes wird eine Beschreibung eines Herstellungsprozesses zum Verkörpern der oben beschriebenen Struktur gegeben.
[Das Auftragen des Ausbreitungsverhinderungsharzes
[Das provisorische Aushärten des Ausbreitungsverhinderungsharzes
[Das Bonden des Drahtes] Sobald das provisorische Aushärten des Ausbreitungsverhinderungsharzes
[Das Auftragen des Drahtverstärkungsharzes
Ferner breitet sich das Drahtverstärkungsharz
[Das vollständige Aushärten] Sobald das Auftragen des Drahtverstärkungsharzes
Als Nächstes wird eine Beschreibung der Beziehung zwischen einer relativen Dielektrizitätskonstante des Ausbreitungsverhinderungsharzes
Das heißt, der Umfang des Chips
<Die vorteilhaften Wirkungen der ersten Ausführungsform><The Beneficial Effects of First Embodiment>
Um das Drahtverstärkungsharz
In Reaktion darauf wird gemäß der vorliegenden Ausführungsform das Ausbreitungsverhinderungsharz
Selbst wenn das Leistungshalbleitermodul hergestellt wird, ermöglicht zusätzlich das Anordnen des Ausbreitungsverhinderungsharzes
Die zweite AusführungsformThe second embodiment
<Die Konfiguration der zweiten Ausführungsform><The Configuration of the Second Embodiment>
Als Nächstes wird eine Beschreibung der Konfiguration des Leistungshalbleitermoduls gemäß einer zweiten Ausführungsform der vorliegenden Erfindung gegeben. Es wird angegeben, dass in der zweiten Ausführungsform die Teile, die jenen der ersten Ausführungsform entsprechen, durch die gleichen Bezugszeichen bezeichnet sind und deren Beschreibungen weggelassen werden.Next, a description will be given of the configuration of the power semiconductor module according to a second embodiment of the present invention. It is noted that, in the second embodiment, the parts corresponding to those of the first embodiment are denoted by the same reference numerals and their descriptions are omitted.
Das Modul der zweiten Ausführungsform ist ein SiC-Hybrid-Leistungshalbleitermodul, an dem Silicium-IGBTs als eine Schaltelementgruppe, wobei jeder eine Spannungsfestigkeit von 3,3 kV und eine Nennstromkapazität von 1200 A aufweist, und SBDs (Schottky-Barrieren-Dioden; die im Folgenden als SiC-SBDs abgekürzt sind) als eine Diodenelementgruppe, jede unter Verwendung von SiC (Siliciumcarbid), angebracht sind.The module of the second embodiment is a SiC hybrid power semiconductor module on which silicon IGBTs as a switching element group, each having a withstand voltage of 3.3 kV and a rated current capacity of 1200A, and SBDs (Schottky barrier diodes; Hereinafter abbreviated as SiC SBDs) as a diode element group, each using SiC (silicon carbide).
Weil das Aussehen und die Gehäusestruktur des Moduls der vorliegenden Ausführungsform die gleichen wie jene der ersten Ausführungsform sind, ist jedoch die Veranschaulichung weggelassen, wobei dennoch der Aufbau des isolierenden Substrats beschrieben wird. In der vorliegenden Ausführungsform wird ein in
In der vorliegenden Ausführungsform wird außerdem der Draht
Der PN-Dioden-Chip
Ein unter Verwendung von SiC dargestellter Halbleiter mit breiter Bandlücke kann eine weitere vorteilhafte Wirkung gewinnen. Das SiC weist eine höhere elektrische Feldstärke des dielektrischen Durchschlags als Silizium auf, um es zu ermöglichen, dass ein Halbleiter entworfen wird, der eine vergrößerte elektrische Feldstärke innerhalb des Chips aufweist, wobei folglich der Abschlussbereich (der Relaxationsbereich des elektrischen Feldes)
In der ersten Ausführungsform wird das Ausbreitungsverhinderungsharz
Dann wird ein Ausbreitungsverhinderungsharz
In der vorliegenden Ausführungsform wird ein Polyetherimidharz unter Verwendung eines Füllmaterials, damit es eine hohe Viskosität aufweist, als das Ausbreitungsverhinderungsharz
<Die vorteilhaften Wirkungen der zweiten Ausführungsform><The Beneficial Effects of the Second Embodiment>
Wie oben beschrieben worden ist, wird das Polyetherimidharz für das Ausbreitungsverhinderungsharz
Soweit wie das Ausbreitungsverhinderungsharz
Modifikationenmodifications
Die vorliegende Erfindung ist nicht auf die oben beschriebenen ersten und zweiten Ausführungsformen eingeschränkt, wobei verschiedene Modifikationen möglich sind, z. B. wie folgt.The present invention is not limited to the above-described first and second embodiments, various modifications being possible, e.g. B. as follows.
In der ersten und der zweiten Ausführungsform sind Beispiele des Anwendens der vorliegenden Erfindung auf ein Leistungshalbleitermodul beschrieben worden, wobei aber die vorliegende Erfindung nicht darauf eingeschränkt ist, auf ein Leistungshalbleitermodul angewendet werden, wobei sie auf verschiedenen Leistungsumsetzungsvorrichtungen angewendet werden kann. Es ist z. B. eine Vorrichtung innerhalb des Schutzumfangs der vorliegenden Erfindung enthalten, die einen Inverter, einen Umsetzer und dergleichen in einer Baugruppe enthält, um einen Direktumrichter, einen Matrixumsetzer oder dergleichen zu konfigurieren.In the first and second embodiments, examples of applying the present invention to a power semiconductor module have been described, but the present invention is not limited to be applied to a power semiconductor module, and it can be applied to various power conversion devices. It is Z. For example, an apparatus may be included within the scope of the present invention that includes an inverter, a converter, and the like in an assembly to configure a cyclo-converter, matrix converter, or the like.
In der zweiten Ausführungsform ist ein Beispiel unter Verwendung eines Siliciumcarbids (SiC) als ein Beispiel eines Halbleiters mit einer breiten Bandlücke beschrieben worden. Der Halbleiter mit einer breiten Bandlücke ist jedoch nicht auf einen unter Verwendung von SiC eingeschränkt, wobei z. B. Galliumnitrid oder Diamant verwendet werden können.In the second embodiment, an example using a silicon carbide (SiC) as an example of a wide bandgap semiconductor has been described. However, the wide bandgap semiconductor is not limited to one using SiC, where e.g. As gallium nitride or diamond can be used.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1111
- IGBT-Chip (Halbleiterchip)IGBT chip (semiconductor chip)
- 1212
- PN-Dioden-Chip (Halbleiterchip)PN diode chip (semiconductor chip)
- 1313
- Drahtwire
- 1414
- SiC-SBD-Chip (Halbleiterchip)SiC SBD chip (semiconductor chip)
- 2121
- HauptelektrodenanschlussMain electrode terminal
- 22, 2322, 23
- isolierendes Substratinsulating substrate
- 2727
- Schaltungsmuster mit gemeinsamen Emitter (gemeinsamer Source) (Schaltungsmuster)Circuit pattern with common emitter (common source) (circuit pattern)
- 2828
- HauptanschlusskontaktMain Line Contact
- 3131
- Aluminiumelektrode (Oberflächenelektrode)Aluminum electrode (surface electrode)
- 3232
- Abschlussbereichtermination region
- 3434
- Ausbreitungsverhinderungsharz (zweiter Harzfilm)Spreading prevention resin (second resin film)
- 3535
- Hochtemperatur-BleilotHigh-lead solder
- 3636
- Silicongel (Geldichtungsmittel)Silicone gel (liquid)
- 3737
- SchaltungsverdrahtungsmetallCircuit wiring metal
- 4040
- Drahtverstärkungsharz (erster Harzfilm)Wire reinforcement resin (first resin film)
- 5757
- gebondeter Abschnittbonded section
- 5858
- dicker Abschnittthick section
- 6565
- SiO2-Film (Siliciumdioxidschicht)SiO 2 film (silicon dioxide layer)
- 6666
- Polyimidfilmpolyimide film
- 7171
- Schottky-ElektrodeSchottky electrode
- 7272
- Abschlussbereichsterminal region
- 7474
- Ausbreitungsverhinderungsharz (zweiter Harzfilm)Spreading prevention resin (second resin film)
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