DE4019915A1 - Verfahren und einrichtung zur herstellung einer verbindung zwischen einem bonddraht und einer metallischen kontaktflaeche - Google Patents
Verfahren und einrichtung zur herstellung einer verbindung zwischen einem bonddraht und einer metallischen kontaktflaecheInfo
- Publication number
- DE4019915A1 DE4019915A1 DE4019915A DE4019915A DE4019915A1 DE 4019915 A1 DE4019915 A1 DE 4019915A1 DE 4019915 A DE4019915 A DE 4019915A DE 4019915 A DE4019915 A DE 4019915A DE 4019915 A1 DE4019915 A1 DE 4019915A1
- Authority
- DE
- Germany
- Prior art keywords
- laser
- impurities
- contact surface
- oxide
- contact face
- 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- Withdrawn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
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-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01029—Copper [Cu]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01046—Palladium [Pd]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01058—Cerium [Ce]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01076—Osmium [Os]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/013—Alloys
- H01L2924/0132—Binary Alloys
- H01L2924/01327—Intermediate phases, i.e. intermetallics compounds
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Wire Bonding (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Einrichtung zum Her
stellen einer Verbindung zwischen einem Bonddraht und einer
metallischen Kontaktfläche, sowie eine nach diesem Verfahren kontak
tierte elektronische Baugruppe nach der Gattung der unabhängigen
Ansprüche.
Leiterplattenelemente, wie z. B. diskrete oder integrierte Halb
leiterelemente, müssen mit Hilfe dünner Bonddrähte aus Gold oder
Aluminium oder auch anderen Metallen wie Kupfer oder Palladium
elektrisch mit ihrer Umwelt verbunden werden. Bei diesem Bondprozeß
werden die Bonddrähte bei erhöhter Temperatur und unter Einwirkung
von Ultraschallenergie mit einem metallisierten Anschluß, z. B. auf
einer Leiterplatte oder einer Kontaktspinne, verbunden. Eine Gold
metallisierung auf diesem Anschluß hat sich als zuverlässiges
Kontaktmaterial bewährt.
Entscheidend für die Zuverlässigkeit einer Bondstelle sind saubere
grenzschichtfreie Oberflächen. Es ist bekannt (DE-OS 37 04 200), die
Kontaktstellen vor dem Bonden des Drahtes metallisch zu überziehen,
um so eine Diffusionssperrschicht herzustellen, die eine Korrosion
der Verbindungsstelle verhindert. Weiterhin wurde bereits vorge
schlagen (DE-OS 36 41 524), um eine Interdiffusion zwischen dem
Bonddraht und der Metallschicht der Kontaktfläche zu verhindern, die
Bondstelle nach dem Bonden einer Thermobehandlung zu unterziehen.
Dadurch soll einem Anwachsen intermetallischer Zusammensetzungen
entgegengewirkt und so die Haltbarkeit der Bondverbindung gesteigert
werden. Das metallische Überziehen der Kontaktfläche vor dem Bond
prozeß läßt sich durch die nachgeschaltete Behandlung nicht ersetzen.
Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des
Anspruchs 1 hat demgegenüber den Vorteil, daß sich der Bondprozeß
unmittelbar auf der metallischen Kontaktfläche durchführen läßt, die
vorzugsweise aus Nichtmetallen wie Kupfer oder Nickel gebildet ist.
Eine aufwendige und teure Sondermetallisierung, z. B. mit Gold und
Nickel, kann entfallen. So lassen sich insbesondere bei dem Einsatz
unverpackter Halbleiterelemente auf Leiterplatten Aluminiumbond
drähte unmittelbar auf entsprechende Kupferkontaktflächen bonden.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor
teilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch
angegebenen Vefahrens möglich. Um eine von Oxid oder sonstigen Ver
unreinigungen freie Kontaktoberfläche herzustellen und um eine prin
zipiell denkbare, aber technisch nur sehr schwer realisierbare naß
chemische Vorbehandlung zu vermeiden, wird vorgeschlagen, zur Ent
fernung des Oxids und der Verunreinigungen einen Laser, vorzugsweise
einen Excimer-Laser (Phy. Blätter 46 Nr. 5 (1990) S. A334-A336),
einzusetzen. Besonders vorteilhaft ist es, wenn der Laser mit einer
geeigneten Wellenlänge strahlt, so daß die zugeführte Energie aus
reicht, um chemische Bindungen in Oxiden oder anderen Verunreini
gungen aufzubrechen. Durch einen Impulsbetrieb des Lasers im Nano
sekundenbereich ist es möglich, kurzzeitig hohe Energiedichten
bereitzustellen.
In besonders einfacher Weise gestaltet sich der Aufbau einer Ein
richtung zur Durchführung des Verfahrens, wenn eine handelsübliche
Bondeinrichtung, z. B. ein Hand- oder Automatikbonder, mit einem
Lasersystem kombiniert wird, wobei der Laserstrahl auf die Bond
fläche gerichtet ist.
Durch das Wegfallen des Fertigungsschrittes einer Sondermetalli
sierung der Kontaktfläche und durch das Einsparen von Edelmetall
verbilligen sich die nach dem erfindungsgemäßen Verfahren herge
stellten elektronischen Baugruppen.
In Fig. 1 ist eine Kontaktfläche einer Leitenplatine vor dem Bonden
im Schnitt dargestellt. Fig. 2 zeigt den Reinigungsprozeß, Fig. 3
den Bondvorgang und Fig. 4 die fertiggestellte Kontaktierung eines
Bonddrahtes auf einer metallischen Kontaktfläche der Leiterplatte.
In Fig. 5 ist eine mit einem Laser kombinierte Bondeinrichtung
gezeigt.
Die in den Fig. 1 bis 4 dargestellte Leiterplatte 10 besitzt auf
dem Substrat 11 eine Kontaktfläche 12. Diese Kontaktfläche 12
besteht aus einem Nichtedelmetall, vorzugsweise Kupfer und stellt
das Verbindungsglied der integrierten Schaltung zu anderen Bauele
menten oder elektrischen Anschlüssen dar. Durch Korrosionswirkungen
kann die Kontaktfläche 12 von einer Metalloxidschicht 13 oder
anderen organischen bzw. anorganischen Verunreinigungen 13′ bedeckt
sein. Da diese Verunreinigungsschichten 13 und 13′ eine haftfeste
Verbindung zwischen Bonddraht 20 und Kontaktfläche 12 verhindern,
müssen sie vor dem Bonden des Drahtes 20 entfernt werden. Dazu
(Fig. 2) wird ein Laserstrahl 22 auf die Kontaktfläche 12
fokussiert, welcher dann im Impulsbetrieb im Nanosekundenbereich auf
die Verunreinigungsschichten 13 und 13′ einwirkt. Durch eine
geeignete Wahl der Laserwellenlänge ist es möglich, das Metalloxid
13 und die anderen Verunreinigungen 13′ chemisch zu zerlegen. Die
hierfür typischen Bindungsenergien liegen bei 4 bis 5 Elektronen
volt. Solche Werte können mit einem Excimer-Laser mit einer Wellen
länge von ca. 200 nm erreicht werden. Bei geeigneter Wahl der
Energiedichte des Laserstrahls 22 ist es möglich, selektiv nur die
Metalloxidschicht 13 und die anderen Verunreinigungen 13′ zu ent
fernen und das Metall der Kontaktfläche 12 nicht anzugreifen.
Der Laserstrahl 22 entfernt auf diese Weise einen Teil 24 oder die
gesamte Metalloxidschicht 13 und die anderen Verunreinigungen 13′
und legt die sich darunter befindliche Kontaktfläche 12 frei. In
einem nachfolgenden Arbeitsgang (Fig. 3) erfolgt die Zuführung des
Bonddrahtes 20 mittels einer Kapillare 26. Der Bonddraht 20 aus
Aluminium, Gold, Kupfer, Palladium oder dergleichen kann an seinem
zur Kontaktfläche 12 weisenden Ende eine Verdickung 28 besitzen, die
innerhalb der Aussparung 24 auf die Kontaktfläche 12 aufgesetzt
wird. Bevor der Bonddraht 20 beim Aufsetzvorgang in den Strahl
bereich des Laserstrahls 22 eintaucht, wird der Laser 30 ausge
schaltet. Mit 32 ist die Wirklinie des Lasers angedeutet, die unter
einem Winkel α gegen die Vertikale geneigt auf die Kontaktfläche
12 trifft.
Nach dem Aufsetzen des Bonddrahtes 20 auf der Kontaktfläche 12 wird
durch Zufuhr von Ultraschallenergie die Verdickung 28 mit der
Kontaktfläche 12 verschweißt, wodurch eine einlegierte Zone 34 ent
steht (Fig. 4). Das freie Ende des Bonddrahtes 20 kann jetzt nach
außen geführt werden und einen weiteren Anschluß zur Leiterplatte
herstellen.
Zur Durchführung des Verfahrens wird eine handelsübliche Bondein
richtung 34 benützt (Fig. 5), bei der das Leiterplattenelement 10
auf einem Schlitten 36 befestigt ist. Die Zuführung des Bonddrahtes
20 mittels der Kapillare 26 kann dabei automatisch oder von Hand
erfolgen. Zur Erzeugung des fokussierten Laserstrahls 22 ist an der
Bondeinrichtung 34 ein Laser 30 vorgesehen. Der Laser 30 wird dazu
mittels eines Anschlußflansches 38 in den Strahlengang der Beleuch
tungsoptik eingekoppelt, es kann aber auch ein separater Strahlen
gang vorgesehen sein.
Claims (9)
1. Verfahren zur Herstellung einer Verbindung zwischen einem Bond
draht (20) und einer metallischen Kontaktfläche (12), insbesondere
bei Leiterplattenelementen (10), vorzugsweise diskreten oder inte
grierten Halbleiterelementen, dadurch gekennzeichnet, daß die
Kontaktfläche (12) vor dem Bonden des Drahtes (20) vom Oxid (13) und
anderen Verunreinigungen (13′) befreit wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Ent
fernung des Oxids (13) und anderer Verunreingigungen (13′) von der
Kontaktfläche (12) ein Laser (30), vorzugsweise ein Excimer-Laser,
eingesetzt wird.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Laser
(30) in seiner Wellenlänge so gewählt ist, daß die zugeführte
Energie ausreicht, das Oxid (13) und andere Verunreinigungen (13′)
chemisch zu zerlegen.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der
Laser (30) eine Wellenlänge zwischen 180 nm und 350 nm, vorzugsweise
193 nm besitzt.
5. Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeich
net, daß der Laser (30) in kurzen Impulsen, vorzugsweise im Nanno
sekundenbereich, auf die Oxidschicht (13) und andere Verunreini
gungen (13′) wirkt.
6. Einrichtung zur Durchführung des Verfahrens nach einem der
vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine handels
übliche Bondeinrichtung (34) mit einem Lasersystem (30), vorzugs
weise einem Excimer-Lasersystem, kombiniert ist.
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der
Laserstrahl (22) auf die Bondfläche (24) fokussiert ist.
8. Elektronische Baugruppe, insbesondere Halbleiterelement, her
gestellt nach dem Verfahren gemäß einem der vorhergehenden
Ansprüche, mit mindestens einer metallischen Kontaktfläche (12), auf
der mindestens ein Bonddraht (20) aufgebracht ist, dadurch gekenn
zeichnet, daß der Bonddraht (20) direkt auf die Kontaktfläche (12)
ohne Zwischenschicht aufgebondet ist, und daß die Kontaktfläche (12)
vor dem Aufbringen des Bonddrahts (20) durch Einwirkung eines oder
mehrerer Laserimpulse vom Oxid (13) und anderer Verunreinigungen
(13′) befreit ist.
9. Elektronische Baugruppe nach Anspruch 8, dadurch gekennzeichnet,
daß die Kontaktfläche (12) aus Kupfer oder Nickel besteht.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4019915A DE4019915A1 (de) | 1990-06-22 | 1990-06-22 | Verfahren und einrichtung zur herstellung einer verbindung zwischen einem bonddraht und einer metallischen kontaktflaeche |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4019915A DE4019915A1 (de) | 1990-06-22 | 1990-06-22 | Verfahren und einrichtung zur herstellung einer verbindung zwischen einem bonddraht und einer metallischen kontaktflaeche |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4019915A1 true DE4019915A1 (de) | 1992-01-02 |
Family
ID=6408876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4019915A Withdrawn DE4019915A1 (de) | 1990-06-22 | 1990-06-22 | Verfahren und einrichtung zur herstellung einer verbindung zwischen einem bonddraht und einer metallischen kontaktflaeche |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4019915A1 (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4202074A1 (de) * | 1992-01-25 | 1993-07-29 | Audi Ag | Verfahren zum entlacken von teilen |
DE4241575A1 (de) * | 1992-12-10 | 1994-06-16 | Baldwin Gegenheimer Gmbh | Verfahren und Vorrichtung zum kontaktfreien Entfernen von Schmutz von Gegenständen, insbesondere von Druckmaschinen-Zylindern |
US5463951A (en) * | 1993-01-20 | 1995-11-07 | Baldwin-Gegenheimer Gmbh | Printing machine spray device |
DE4427111A1 (de) * | 1994-07-30 | 1996-02-01 | Kolbe & Co Hans | Verfahren zur Herstellung einer zuverlässigen Bondverbindung |
WO1996007984A1 (de) * | 1994-09-05 | 1996-03-14 | Siemens Aktiengesellschaft | Verfahren zur herstellung eines chipkartenmoduls für kontaktlose chipkarten |
DE19617387C1 (de) * | 1996-04-30 | 1997-11-20 | Siemens Ag | Verfahren zur Laserstrukturierung von Metalloberflächen |
DE10006968A1 (de) * | 2000-02-16 | 2001-09-06 | Infineon Technologies Ag | Verfahren und Vorrichtung zum Entfernen von Haftvermittlern in der Halbleiterfertigung |
SG93927A1 (en) * | 2001-02-16 | 2003-01-21 | Inst Of Microelectronics | Process of forming metal surfaces compatible with a wire bonding and semiconductor integrated circuits manufactured by the process |
DE102004011929A1 (de) * | 2004-03-11 | 2005-09-29 | Conti Temic Microelectronic Gmbh | Verfahren zur Herstellung einer Bondverbindung zwischen elektrischen Kontaktflächen |
WO2008116761A1 (de) * | 2007-03-28 | 2008-10-02 | Robert Bosch Gmbh | Verfahren und vorrichtung zum herstellen einer bondverbindung |
-
1990
- 1990-06-22 DE DE4019915A patent/DE4019915A1/de not_active Withdrawn
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4202074A1 (de) * | 1992-01-25 | 1993-07-29 | Audi Ag | Verfahren zum entlacken von teilen |
DE4241575A1 (de) * | 1992-12-10 | 1994-06-16 | Baldwin Gegenheimer Gmbh | Verfahren und Vorrichtung zum kontaktfreien Entfernen von Schmutz von Gegenständen, insbesondere von Druckmaschinen-Zylindern |
US5592879A (en) * | 1992-12-10 | 1997-01-14 | Baldwin-Gegenheimer Gmbh | Method and apparatus for the contact-free removal of dirt from the cylinders of printing machines |
US5463951A (en) * | 1993-01-20 | 1995-11-07 | Baldwin-Gegenheimer Gmbh | Printing machine spray device |
DE4427111A1 (de) * | 1994-07-30 | 1996-02-01 | Kolbe & Co Hans | Verfahren zur Herstellung einer zuverlässigen Bondverbindung |
CN1105988C (zh) * | 1994-09-05 | 2003-04-16 | 西门子公司 | 制作用于无触点智能卡的智能卡模块的方法 |
WO1996007984A1 (de) * | 1994-09-05 | 1996-03-14 | Siemens Aktiengesellschaft | Verfahren zur herstellung eines chipkartenmoduls für kontaktlose chipkarten |
US5809633A (en) * | 1994-09-05 | 1998-09-22 | Siemens Aktiengesellschaft | Method for producing a smart card module for contactless smart cards |
DE19617387C1 (de) * | 1996-04-30 | 1997-11-20 | Siemens Ag | Verfahren zur Laserstrukturierung von Metalloberflächen |
DE10006968A1 (de) * | 2000-02-16 | 2001-09-06 | Infineon Technologies Ag | Verfahren und Vorrichtung zum Entfernen von Haftvermittlern in der Halbleiterfertigung |
SG93927A1 (en) * | 2001-02-16 | 2003-01-21 | Inst Of Microelectronics | Process of forming metal surfaces compatible with a wire bonding and semiconductor integrated circuits manufactured by the process |
DE102004011929A1 (de) * | 2004-03-11 | 2005-09-29 | Conti Temic Microelectronic Gmbh | Verfahren zur Herstellung einer Bondverbindung zwischen elektrischen Kontaktflächen |
WO2008116761A1 (de) * | 2007-03-28 | 2008-10-02 | Robert Bosch Gmbh | Verfahren und vorrichtung zum herstellen einer bondverbindung |
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