Patent ID: 6433374
Filing Date: 2002-08-13
Classification: H01L

Abstract:
A light receiving device with a built-in circuit, comprising:a first conductivity type semiconductor lamination structure; a photodiode for converting light incident thereon to an electric signal by a junction with a first second conductivity type semiconductor layer provided on the first conductivity type semiconductor lamination structure for processing the electric signal obtained by the photoelectric conversion; and a signal processing circuit provided in a region different from the photodiode, wherein: the first conductivity type semiconductor lamination structure includes: a first conductivity type semiconductor substrate, a first first conductivity type semiconductor layer provided on the first conductivity type semiconductor substrate and having a higher impurity concentration than the first conductivity type semiconductor substrate, and a second first conductivity type semiconductor layer provided on the first first conductivity type semiconductor layer and having a lower impurity concentration than that of the first first conductivity type semiconductor layer, wherein the photodiode is provided in a region surrounded by a third first conductivity type semiconductor layer provided so as to substantially contact a surface of the first first conductivity type semiconductor layer and a fourth conductivity type semiconductor layer extended from a surface of the first second conductivity type semiconductor layer so as to reach the third first conductivity type semiconductor layer, and wherein the signal processing circuit includes at least a MOS structure transistor.