Patent ID: 6078071
Filing Date: 2000-06-20
Classification: H01L

Abstract:
A semiconductor device, comprising:a substrate;a channel region of a compound semiconductor material formed in a surface part of said substrate;a gate structure formed on said channel region;a pair of first diffusion regions formed in said surface part of said substrate at both lateral sides of said channel region, each of said first diffusion regions containing an impurity element with a first concentration level; anda pair of second diffusion regions formed in said surface part of said substrate at respective outer sides of said first diffusion regions, each of said second diffusion regions containing said impurity element with a second concentration level higher than said first concentration level;said gate structure including a Schottky electrode making a Schottky contact with said channel region, a low-resistance layer provided above said Schottky electrode, and a stress-relaxation layer interposed between said Schottky electrode and said low-resistance layer,said low-resistance layer and said stress-relaxation layer forming an overhang structure with respect to said Schottky electrode.