Patent ID: 8802972

Claim:
A photoelectric conversion device, comprising: a semiconductor substrate comprising a front side and a back side; a protective layer formed on the front side of the semiconductor substrate; a first non-single crystalline semiconductor layer formed on the back side of the semiconductor substrate, the first non-single crystalline semiconductor layer being an intrinsic semiconductor layer; a first conductive layer comprising a first impurity formed on a first portion of a back side of the first non-single crystalline semiconductor layer; a second conductive layer comprising the first impurity and a second impurity formed on a second portion of the back side of the first non-single crystalline semiconductor layer; and a trench between the first conductive layer and the second conductive layer, wherein: the first impurity comprises a group 3 or 5 element, the second impurity comprises a group 3 or 5 element, and the first and second impurities comprise different group elements than each other, and the first and the second conductive layers include polycrystalline or amorphous silicon.