High-Efficient Flexible Perovskite Solar Cells with Low Temperature TiO2 Layer via UV/Ozone Photo-Annealing Treatment

A facile and low-temperature solution processed UV/ozone process has been proposed for fabricating TiO2 layer, making it possible to fabricate planar perovskite solar cells at low temperature. UV/ozone photo-annealing treatment could easily eliminate the organic components, resulting in high quality amorphous TiO2 films with high transparency, electrical conductivity, and hydrophilicity. In addition, perovskite solar cells with the UV/ozone-treated TiO2 electron transport layer exhibiting the best power conversion efficiency of 11.58% for rigid substrate and 7.33% for flexible substrate, respectively. The results clearly indicate that UV/ozone photo-annealing treatment is a simple and effective process of fabricating high performance flexible perovskite solar cells.