Room temperature bonding of wafers with thin nanocrystalline metal films

T. Shimatsu, M. Uomoto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

62 Citations (Scopus)


Room temperature bonding between two flat wafers using thin metal films was studied. Thin nanocrystalline metal films (0.2-20 nm thick) were fabricated on two flat wafers' surfaces using sputter deposition. Bonding of the two metal films on the wafers was accomplished immediately after film deposition in vacuum. The wafers were bonded at room temperature over the entire bonded area using metal films of 16 kinds including W films. The two films' bonded structure was related closely to the self-diffusion coefficients of the metal films. The very high atomic diffusion coefficient at the grain boundaries and film surfaces is likely to have enabled bonding at room temperature. The wafers were bonded even with films of 0.2 nm thickness on each side. The potential of the bonding for applications to device fabrication is examined. Moreover, bonding in air using noble metal films is examined according to experimental results.

Original languageEnglish
Title of host publicationSemiconductor Wafer Bonding 11
Subtitle of host publicationScience, Technology, and Applications - In Honor of Ulrich Gosele
PublisherElectrochemical Society Inc.
Number of pages12
ISBN (Electronic)9781607681731
ISBN (Print)9781566778237
Publication statusPublished - 2010

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737


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