Magnetic-biased chiral molecules enabling highly oriented photovoltaic perovskites
Jing Chen, Caner Değer, Zhenhuang Su, Kai‐Li Wang, Guangpeng Zhu, Junjie Wu, Bingchen He, Chun‐Hao Chen, Tao Wang, Xingyu Gao, İlhan Yavuz, Yanhui Lou, Zhao‐Kui Wang, Liang‐Sheng Liao
Abstract
) photovoltaics. Fortunately, the revolving A-site presents an opportunity to strengthen this interaction by utilizing an external field. Herein, we propose a novel approach to achieving an ordered magnetic dipole moment, which is regulated by a magnetic field via the coupling effect between the chiral passivation molecule and the A-site (formamidine ion) in perovskites. This strategy can increase the molecular interaction energy by approximately four times and ensure a well-ordered molecular arrangement. The quality of the deposited perovskite film is significantly optimized with inhibited nonradiative recombination. It manages to reduce the open-circuit voltage loss of photovoltaic devices to 360 mV and increase the power conversion efficiency to 25.22%. This finding provides a new insight into the exploration of A-sites in perovskites and offers a novel route to improving the device performance of perovskite photovoltaics.