Patent ID: 9024327
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A semiconductor device structure comprising: a wide-bandgap semiconductor portion selected from the group consisting of silicon carbide and Group III nitrides; an interconnect structure to said wide-bandgap semiconductor portion, said interconnect structure comprising a plurality of diffusion barrier layers alternating with a plurality of high electrical conductivity layers, the plurality of diffusion barrier layers and the plurality of high electrical conductivity layers comprising: a first adhesion layer, wherein the first diffusion barrier layer is directly on the first adhesion layer; said plurality of diffusion barrier layers having a coefficient of thermal expansion different from and lower than a coefficient of thermal expansion of said plurality of high electrical conductivity layers; and the difference in the respective coefficients of thermal expansions being large enough to constrain the expansion of said plurality of high electrical conductivity layers but less than a difference that would create a strain between adjacent diffusion and high electrical conductivity layers that would exceed a bond strength between the adjacent diffusion and high electrical conductivity layers.