Application of Electrodeposition for the Preparation of TiO2 Compact Layer in Perovskite Solar Cells

Wednesday, 4 October 2017: 09:10
National Harbor 9 (Gaylord National Resort and Convention Center)
T. S. Su and T. C. Wei (National Tsing Hua University)
Compact layer (CL) with pinhole-free and excellent electron conductivity is critical in high-efficient scaffold-type perovskite solar cells. In this study, we thoroughly investigated electrodeposited TiOX (ED-TiOX) on FTO glass from aqueous TiCl3 solution including the kinetics of the electrodeposition, film morphology, optical and electronic properties. Furthermore, by controlling the total charge amount, the thickness of ED-TiOX films as well as device performance are tunable. When applying this method to fabricate the CL for scaffold-type perovskite solar cells, we compared the hole blocking effectiveness, charge extraction capability and photovoltaic performance of TiO2 CLs made by electrodeposition and other common methods such as dip coating (DC), spin coating (SC) and spray pyrolysis (SP). Current results reveal ED-TiOX CL performs best for its full coverage, thinnest thickness and mossy surface, rendering high shunt resistance and low ohmic resistance. In addition, our results also confirm in scaffold-type perovskite solar cell configuration, CL still provides charge extraction function in addition to the mesoporous scaffold. The device using ED-TiOX CL currently shows highest power conversion efficiency (PCE) up to 15.48%.