METHOD OF PRODUCING CIGS FILM, AND METHOD OF PRODUCING CIGS SOLAR CELL BY USING SAME

摘要

A CIGS film production method is provided which ensures that a CIGS film having a higher conversion efficiency can be produced at lower costs at higher reproducibility even for production of a large-area device. A CIGS solar cell production method is also provided for producing a CIGS solar cell including the CIGS film. The CIGS film production method includes: a stacking step of stacking a layer (A) containing indium, gallium and selenium and a layer (B) containing copper and selenium in a solid phase in this order over a substrate; and a heating step of heating a stacked structure including the layer (A) and the layer (B) to melt a compound of copper and selenium of the layer (B) into a liquid phase to thereby diffuse copper from the layer (B) into the layer (A) to permit crystal growth to provide a CIGS film.

主权项

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