Author:
Persson B. N. J.,Mate C. Mathew
Abstract
Abstract
Bodies made from elastically stiff material usually bind very weakly unless the surfaces are flat and extremely smooth. In direct wafer bonding flat surfaces bind by capillary bridges and by the van der Waals interaction, which act between all solid objects. Here we study the dependency of the work of adhesion on the humidity and surface roughness in hydrophilic direct wafer bonding. We show that the long-wavelength roughness (usually denoted waviness) has a negligible influence on the strength of wafer bonding (the work of adhesion) from the menisci that form from capillary condensation of water vapor.
Graphic abstract
AFM surface topography for Si(100) wafer
Funder
Forschungszentrum Jülich GmbH
Publisher
Springer Science and Business Media LLC
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