Comparison of Aluminum Zinc Oxide and Indium Tin Oxide for Transparent Conductive Oxide layer in Cu(In,Ga)Se2 Solar Cell

The photovoltaic performances of i-ZnO/CdS/Cu(In,Ga)Se-2(CIGS) solar cell with different window architectures of SnO2:In2O3(ITO), Al2O3:ZnO (AZO) and ITO/AZO, were experimentally compared. The solar cell with ITO deposited directly on i-ZnO layer showed an abnormal current-voltage characteristic as having a shunt path. Both of AZO and ITO/AZO resulted in normal current-voltage behavior as far as AZO is contacting ZnO.