Patent ID: 9136296
Filing Date: 2015-09-15
Classification: G01T,H01L

Abstract:
1. A photodiode comprising: a first semiconductor layer having a first conductivity type; a second semiconductor layer having a second conductivity type that is opposite to the first conductivity type of the first semiconductor layer; a first insulating film formed on end portions of the first semiconductor layer; a wiring layer formed on the first insulating film, wherein the wiring layer includes a plurality of wiring lines; a second insulating film formed on the wiring layer and the first insulating film; a contact hole formed in the first and second insulating films exposing a portion of the first semiconductor layer; and a third semiconductor layer interposed between the first semiconductor layer and the second semiconductor layer and formed on end portions of the first insulating film, on end portions and top portions of the second insulating film, and on the portion of the first semiconductor layer exposed by the contact hole such that the third semiconductor layer is in contact with the first semiconductor layer through the contact hole, wherein the second semiconductor layer is formed on the third semiconductor layer, the second semiconductor layer having a shape that is substantially the same as that of the third semiconductor layer, and wherein an edge of the first semiconductor layer in contact with the third semiconductor layer is inset with respect to an edge of the second semiconductor layer formed at an interface of the second semiconductor layer and a third insulating film.