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Abstract
Highlights
A special additive-(benzylamine)trifluoroboron (BBF) is applied to improve the quality of FAMAPbI3 perovskite.
BBF concurrently passivates cationic and anionic perovskite defects.
The perovskite solar cell with BBF shows a high power conversion efficiency of 23.24% and an excellent stability.
Passivating undercoordinated ions is an effective way to reduce the defect densities at the surface and grain boundaries (GBs) of perovskite materials for enhanced photovoltaic performance and stability of perovskite solar cells (PSCs). Here, (BBF) complex is chosen as a multifunctional additive, which contains both C7H9N and BF3 groups working as Lewis base and Lewis acid, respectively, can bond with Pb2+/I− and FA+ on the surface and in the GBs in the perovskite film, affording passivation of both cation and anion defects. The synergistic effect of the C7H9N and BF3 complex slows the crystallization during the perovskite film deposition to improve the crystalline quality, which reduces the trap density and the recombination in the perovskite film to suppress nonradiative recombination loss and minimizes moisture permeation to improve the stability of the perovskite material. Meanwhile, such an additive improves the energy-level alignment between the valence band of the perovskite and the highest occupied molecular orbital of the hole-transporting material, Spiro-OMeTAD. Consequently, our work achieves power conversion efficiency of 23.24%, accompanied by enhanced stability under ambient conditions and light illumination and opens a new avenue for improving the performance of PSCs through the use of a multifunctional complex.
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Details
1 Shaanxi Normal University, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science & Engineering, Xi’an, People’s Republic of China (GRID:grid.412498.2) (ISNI:0000 0004 1759 8395)
2 Shaanxi Normal University, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science & Engineering, Xi’an, People’s Republic of China (GRID:grid.412498.2) (ISNI:0000 0004 1759 8395); Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Dalian, People’s Republic of China (GRID:grid.9227.e) (ISNI:0000000119573309)