Patent ID: 8338867

Claim:
A photo-sensing device, comprising a photo-sensing element and a switching element provided on an insulating substrate, wherein: said photo-sensing element comprises: a first electrode and a second electrode prepared by introducing phosphorous at a first density on a semiconductor layer, a photoelectric conversion region prepared by introducing phosphorous at a second density, lower than said first density on said semiconductor layer disposed between said first electrode and said second electrode, and a third electrode disposed above said photoelectric conversion region via an insulating film, wherein said third electrode is disposed via said insulating film above all of the photoelectric conversion region except a region of the photoelectric conversion region in contact with said second electrode, and said switching element comprises: a fourth electrode and a fifth electrode prepared by introducing phosphorous at a third density on said semiconductor layer, an active region (channel) prepared by introducing phosphorous at a fourth density lower than said third density on said semiconductor layer disposed between said fourth electrode and said fifth electrode, a moderately doped layer prepared by introducing phosphorous at a fifth density, lower than said third density, on said semiconductor layer disposed between said fourth electrode and said active region (channel), and between said fifth electrode and said active region (channel), and a sixth electrode disposed above said active region (channel) via an insulating film.