Patent ID: 8962379
Filing Date: 2015-02-24
Classification: H01L,Y02E,Y02P

Abstract:
1. A method for producing a CIGS film to be used as a light absorbing layer for a CIGS solar cell, the method comprising: stacking a layer (A) comprising indium, gallium and selenium and a layer (B) comprising copper and selenium in a solid phase in this order over a substrate; and heating a stacked structure including the layer (A) and the layer (B) to melt the layer (B) into a liquid phase to thereby diffuse copper from the layer (B) into the layer (A) to permit crystal growth, thereby providing the CIGS film, wherein the CIGS film obtained at completion of the heating has a molar ratio satisfying 0.95<copper/(indium+gallium)<1.30, wherein while the temperature for the heating is maintained, indium, gallium and selenium are further deposited through evaporation on the CIGS film obtained by the heating, to allow the CIGS film to have a molar ratio satisfying 0.70<copper/(indium+gallium)<0.95.