NH 2 CH═NH 2 PbI 3 : An Alternative Organolead Iodide Perovskite Sensitizer for Mesoscopic Solar Cells
Shuping Pang, Hao Hu, Jiliang Zhang, Siliu Lv, Yaming Yu, Feng Wei, Tianshi Qin, Hongxia Xu, Zhihong Liu, Guanglei Cui
Abstract
A new nearly cubic NH 2 CH═NH 2 PbI 3 (FAPbI 3 ) perovskite was synthesized for the mesoscopic solar cells. The measured band gap of bulk FAPbI 3 is 1.43 eV and it is therefore potentially superior than the CH 3 NH 3 PbI 3 (MAPbI 3 ) as the light harvester. A homogeneous FAPbI 3 perovskite layer was deposited on the TiO 2 surface by utilizing the in situ dipping technology. As a result, a high efficiency of 7.5% was achieved using P3HT as the hole transport material. The nearly cubic crystal structure and appropriate band gap render this new FAPbI 3 perovskite extremely attractive for next generation high-efficiency low-cost solar cells.