Patent ID: 9705018
Date: 2017-07-11
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A photoelectric conversion element, comprising: a back electrode; a homojunction-type light absorbing layer on the back electrode, containing Cu, selected from Al, In and Ga, and selected from Se and S, and having a chalcopyrite structure; and a transparent electrode on the light absorbing layer, wherein the homojunction-type light absorbing layer has a p-type compound semiconductor layer and an n-type compound semiconductor layer, which form the homojunction; a back electrode side-part of the light absorbing layer is of p-type, and a transparent electrode-side part of the light absorbing layer is of n-type, the p-type compound semiconductor layer has a part with an average crystal grain size of 1,000 nm to 3,000 nm in a region from an interface between the back electrode and the light absorbing layer to a depth of 50 nm into the light absorbing layer, and the n-type compound semiconductor layer has a part with an average crystal grain size of at most 500 nm at a site 50 nm apart from an interface between the transparent electrode and the light absorbing layer into the light absorbing layer or the light absorbing layer has an amorphous part at the site 50 nm apart from the interface between the transparent electrode and the light absorbing layer into the light absorbing layer.