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DOI: 10.1007/s00542-017-3520-8
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- Johannes Kepler University Linz
- Austrian Federal Ministry of Science, Research and Economy
- Austrian National Foundation for Research, Technology and Development
Aluminum-aluminum wafer bonding is becoming increasingly important in the production of CMOS microelectromechanical systems. So far, successful bonding has required extreme processing temperatures of 450 A degrees C or more, because the chemically highly stable oxide layer acts as a diffusion barrier between the two aluminum metallization layers. By using the ComBond(A (R)) system, in which a surface treatment and subsequent wafer bonding are both performed in a high vacuum cluster, for the first time successful Al-Al wafer bonding was possible at a temperature of 150 A degrees C. The bonded interfaces were characterized using C-mode scanning acoustic microscopy and transmission electron microscopy, and featured areas of oxide-free, atomic contact.
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