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Erschienen in: Microsystem Technologies 9/2017

02.01.2016 | Technical Paper

Low temperature solid–liquid interdiffusion wafer and die bonding based on PVD thin Sn/Cu films

verfasst von: Sylvain Lemettre, Seonho Seok, Nathalie Isac, Johan Moulin, Alain Bosseboeuf

Erschienen in: Microsystem Technologies | Ausgabe 9/2017

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Abstract

Cu–Sn intermetallic diffusion has been studied with thin Sn and Cu films deposited by physical vapor deposition. It was found that annealing time is critical to the interdiffusion of copper and tin, leading to the formation of Cu6Sn5 and Cu3Sn phases at temperatures of interest. Based on this observation, test wafer bonding have been implemented at 320 and 250 °C with sealing pressures of 0.6, 2, 4, 6 and 10 MPa. The experiments emphasized the importance of the sealing pressure and the existence of a sealing pressure threshold for the success of the bonding. When the sealing pressure was superior to that threshold, at 250 °C a thin (<4 µm) bonded Cu/Cu3Sn/Cu joint was obtained, with none of the voiding defects previously reported by using electroplating.

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Metadaten
Titel
Low temperature solid–liquid interdiffusion wafer and die bonding based on PVD thin Sn/Cu films
verfasst von
Sylvain Lemettre
Seonho Seok
Nathalie Isac
Johan Moulin
Alain Bosseboeuf
Publikationsdatum
02.01.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Microsystem Technologies / Ausgabe 9/2017
Print ISSN: 0946-7076
Elektronische ISSN: 1432-1858
DOI
https://doi.org/10.1007/s00542-015-2784-0

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