[7a-A501-1~11] 12.5 Organic solar cells

[7a-A501-1] [JSAP Young Scientist Award Speech] High Efficiency Perovskite Solar Cells Based on Low Temperature-Processed Brookite TiO₂ Electron Collector

〇Atsushi Kogo¹, Yoshitaka Sanehira², Youhei Numata², Masashi Ikegami², Tsutomu Miyasaka² (1.AIST, 2.Toin Univ. of Yokohama)

Keywords:perovskite solar cells, titanium dioxide, low temperature process

In this study, we have developed brookite TiO₂, prepared at low temperature (<150 ^oC), as an electron collector of perovskite solar cells. Based on dehydration reaction of surface hydroxyl groups, brookite TiO₂ nanoparticles exhibit inter-particle necking and enable formation of a mesoporous electron collector at low temperature below 150 ^oC. The brookite-based CH₃NH₃PbI₃ perovskite solar cells, prepared at 150 ^oC, gave high power conversion efficiency up to 21.6% and 13.4% on glass and plastic substrates, respectively.