We report a world-record total-area efficiency of 17.1% for a polycrys
talline thin-film Cu(In,Ga)Se-2-based photovoltaic solar cell. The inc
orporation of Ga to raise the absorber bandgap has been accomplished s
uccessfully and in such a manner that an open-circuit voltage of 654 m
V and a fill factor of greater than 77% have been achieved. We describ
e briefly the deposition process, the device structure, and the device
performance characteristics.