Patent ID: 9570636
Date: 2017-02-14
CPC Classifications: H01L,Y02E

Claim:
1. A solar cell comprising: a back electrode layer disposed on a support substrate; an ohmic layer disposed on the back electrode layer; a light absorbing layer disposed on the ohmic layer; a buffer layer disposed on the light absorbing layer; and a front electrode layer disposed on the buffer layer; wherein the ohmic layer is disposed between the back electrode layer and the light absorbing layer, wherein the ohmic layer is formed on at least a part of the back electrode layer, wherein the ohmic layer comprises an element that corresponds to an element of the back electrode layer; wherein the element of the back electrode layer, which corresponds to the element of the ohmic layer, comprises molybdenum (Mo); wherein the ohmic layer comprises a first ohmic layer and a second ohmic layer having crystal structures different from each other, wherein the second ohmic layer is formed at a temperature higher than that at which the first ohmic layer is formed, wherein each of the first ohmic layer and the second ohmic layer comprises MoSe wherein an entire crystal surface of the first ohmic layer is perpendicular to a c axis of a MoSe wherein an entire crystal surface of the second ohmic layer is parallel to a c axis of a MoSe wherein the ohmic layer is an electrode, and wherein the light absorption layer has a patterned structure.