In this research, we studied the intermetallic
growth and properties in a multilayer structure of
bismuth, tin and gold films deposited on silicon
substrate in one high vacuum cycle. The bismuth –
tin system is considered as a candidate of Pb-free
solder systems [1,2]. The eutectic Bi –Sn alloy is
composed of 57 at.% of Sn and 43 at.% of Bi and
has a eutectic temperature of 139 jC. Off-eutectic Bi –
Sn alloys can have solidus temperatures ranging from
139 to 230 jC depending on the composition. In
many applications