Patent ID: 8026124

Claim:
A method for fabricating a copper/indium/gallium/selenium solar cell by a wet process under non-vacuum condition that forms the copper/indium/gallium/selenium solar cell having a first transparent conduction oxide (TCO) layer, a copper/indium/gallium/selenium layer and a cadmium sulfide layer, a zinc oxide layer, and a second TCO layer, the method comprising the following steps: performing a first TCO layer forming process for a substrate having a backside electrode layer thereon by using a first TCO layer forming apparatus, wherein the backside electrode layer located on the substrate with a plurality of rollers thereunder, and the substrate is drove forward, and the first TCO layer forming process comprises a mixing process, a coating layer forming process, a drying process, a compacting process, a thermal process, and a cutting process, to form the first TCO layer on the backside electrode; performing a copper/indium/gallium/selenium layer forming process and a cadmium sulfide layer forming process by using a copper/indium/gallium/selenium layer forming apparatus and a cadmium sulfide layer forming apparatus, wherein the copper/indium/gallium/selenium layer and the cadmium sulfide layer forming process comprises a mixing process, a coating layer forming process, a drying process, a compacting process, a primary selenization/sulfidation reaction process, a thermal process, an impure phase removing process, a rear stage selenization/sulfidation reaction process and a cadmium sulfide layer growing process, to sequentially form the copper/indium/gallium/selenium layer and the cadmium sulfide layer on the first TCO layer; performing a zinc oxide layer forming process by using a zinc oxide layer forming apparatus, wherein the zinc oxide layer forming process comprises a mixing process, a coating layer forming process, a drying process, a compacting process, a thermal process, and a cutting process, to form the zinc oxide layer on the cadmium sulfide layer; and performing a second TCO forming process by using a second TCO layer forming apparatus, wherein the second TCO layer forming process forming process comprises a mixing process, a coating layer forming process, a drying process, a compacting process, a thermal process, and a cutting process, to form the second TCO layer on the zinc oxide layer.