Increased Efficiency For Perovskite Photovoltaics Based On Aluminum-Doped Zinc Oxide Transparent Electrodes Via Surface Modification

A majority of perovskite solar cells use indium tin oxide (ITO) or fluorine-doped tin oxide (FTO) as the transparent electrodes. As a promising transparent electrode material, aluminum-doped zinc oxide (AZO) possesses comparable transmittance and conductivity and is environment friendly and low-cost. Herein, we report the fabrication of perovskite solar cells using AZO as the transparent electrodes. A fullerene derivative layer was used to adjust the energy level alignment and to promote electron transport between the CH3NH3PbI3-xClx absorption layer and the AZO electrode. Power conversion efficiency of 13.07% and open-circuit voltage of 1.02 V have been achieved. Our work demonstrates the potential of fabricating cost-effective solar cells on AZO with mild processing temperatures.