Non-vacuum processing of CIGS solar cells on flexible polymeric substrates

Using an ink based non-vacuum process, CIGS solar cells were successfully fabricated on a flexible polymeric \´Upilex\´ substrate. A thin foil (0.001") of \´Upilex\´ was metallized by sputter deposition of 0.4 /spl mu/m thick layer of Mo and CIGS solar cells were fabricated on it. \´Upilex\´ foil along with various device layers on it, withstood the fabrication conditions of ISET\´s process in which the maximum temperature was raised to 500/spl deg/C. A ClGS solar cell with AMO efficiency of 8.0% and specific power density >1280 watts/Kg was fabricated. With further process optimization we expect to achieve AMO of 10% and power density >1500 watts/Kg in CIGS solar cells.