Patent ID: 6313484
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A circuit-integrated light-receiving device, comprising:a semiconductor substrate of a first conductivity type;a first semiconductor crystal growth layer of the first conductivity type provided on a surface of the semiconductor substrate, wherein the first semiconductor crystal growth layer includes a first portion whose impurity concentration gradually decreases in a direction away from the surface of the semiconductor substrate, and a second portion located in a first region above the first portion whose impurity concentration distribution is uniform in a depth direction;a buried diffusion layer of the first conductivity type located in a second region which is above the first portion of the first semiconductor crystal growth layer, and which does not overlap the first region;a second semiconductor crystal growth layer of a second conductivity type which is provided across a surface of the first semiconductor crystal growth layer and a surface of the buried diffusion layer; anda separation diffusion region of the first conductivity type that contacts the second portion but not the first portion of the first semiconductor crystal growth layer, for dividing the second semiconductor crystal growth layer into a light-receiving device section and a signal processing circuit section, wherein:the first region is located in the light-receiving device section; andin the signal processing circuit section, the buried diffusion layer is in contact with the first portion of the first semiconductor crystal growth layer.