Abstract
Contact angles between Au-Ge and Au-Sn alloys and {111} oriented gallium arsenide crystals were determined over the temperature ranges 360 to 450° C and 280 to 400° C, respectively. Three characteristic regions of the temperature dependence of these angles were observed. At the lower temperatures, contact angles,θ, decreased sharply with increasing temperature. This region was followed by another in which the values ofθ were essentially independent ofT and finally, at the higher temperatures,θ decreased again asT increased up to the highest limit indicated above. Based on microstructural and electron microprobe analyses these observations are explained in terms of diffusional processes at the interfacial regions between the gold alloys and GaAs crystals. Furthermore, from observations of the temperature dependence of contact angles between GaAs and pure tin, it is suggested that gold plays an important role in the observed interfacial phenomena.
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