Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The evolution from the original methylammonium (MA)- to formamidinium (FA)-dominated perovskite makes a crucial contribution to improve the photoelectric performance of perovskite solar cells (PSCs) in a decade. However, to obtain α-FAPbI3, annealing temperature above 100 ℃ is essential. In addition, it is still challenging to deposit a uniform and high-quality FA-based perovskite absorber in printable triple-mesoscopic PSC due to the complicated mesoscopic structure. Herein, a low-temperature, two-step sequential deposition method is used for pure FAPbI3 perovskite in printable triple-mesoscopic PSC. By using different lead sources, the crystallization and morphology of lead iodide (PbI2) are finely controlled, which modulates the crystallization and pore filling of perovskite in mesoscopic structure. The improved interface contact promotes the transfer of charge carrier from perovskite to TiO2. With the further introduction of cesium bromide (CsBr) into lead precursor, a power conversion efficiency of 16.24% is achieved. This study provides a deeper understanding of the pore filling and crystallization for both PbI2 and perovskite, and helps explore and optimize the deposition process of perovskite in mesoscopic structure.
The authors acknowledge financial support from the National Natural Science Foundation of China (grant nos. 91733301 and 21702069), the Fundamental Research Funds for the Central Universities, the Science and Technology Department of Hubei Province (grant no. 2017AAA190), the 111 Project (grant no. B07038), and the Program for HUST Academic Frontier Youth Team (grant no. 2016QYTD06). The authors thank the Analytical and Testing Center of Huazhong University of Science and Technology (HUST) for performing various characterization and measurement.
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