Patent ID: 8293567

Claim:
A method for fabricating a copper/indium/gallium/selenium (CIGS) solar cell, comprising: putting a substrate having a molybdenum thin film layer and an alloy thin film layer configured thereupon on a roller set, wherein the molybdenum thin film layer and the alloy thin film layer are configured on the substrate by a sputtering process; driving the roller set to move the substrate toward a direction; using a sputtering machine provided over the alloy thin film layer to execute a sputtering operation on the alloy thin film layer to configure a thermal expansion buffer layer on the alloy thin film layer; configuring a CIGS thin film layer on the thermal expansion buffer layer by executing a thin film deposition process; and conducting a melting thermal treatment to the substrate, together with the molybdenum thin film layer, the alloy thin film layer, and the CIGS thin film layer.