,420 nm thick CH3NH3PbI3?xBrx capping layers for efficient TiO2 nanorod array perovskite solar cells

• 作 者: Long Li Cheng-Wu Shi Xin-Lian Deng Yan-Qing Wang Guan-Nan Xiao Ling-Ling Ni
• 机 构: School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Advanced Catalytic Ma
• 出 处: 中国物理B（英文版）
• 发表日期: 2018年1期
• 关键词: rutile TiO2 nanorod array CH3NH3PbI3?xBrx capping layer perovskite solar cell

The rutile TiO2 nanorod arrays with 240 nm in length, 30 nm in diameter, and 420 μm?2 in areal density were prepared by the hydrothermal method to replace the typical 200–300 nm thick mesoporous TiO2 thin films in perovskite solar cells. The CH3NH3PbI3?xBrx capping layers with different thicknesses were obtained on the TiO2 nanorod arrays using different concentration PbI2·DMSO complex precursor solutions in DMF and the photovoltaic performances of the corresponding solar cells were compared. The perovskite solar cells based on 240 nm long TiO2 nanorod arrays and 420 nm thick CH3NH3PbI3?xBrx capping layers showed the best photoelectric conversion efficiency (PCE) of 15.56％and the average PCE of 14.93 ± 0.63％at the relative humidity of 50％–54％under the illumination of simulated AM 1.5 sunlight (100 mW·cm?2).