Chen Jing, Deger Caner, Su Zhen-Huang, Wang Kai-Li, Zhu Guang-Peng, Wu Jun-Jie, He Bing-Chen, Chen Chun-Hao, Wang Tao, Gao Xing-Yu, Yavuz Ilhan, Lou Yan-Hui, Wang Zhao-Kui, Liao Liang-Sheng
Institute of Functional Nano & Soft Materials (FUNSOM), Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123, China.
Department of Physics, Marmara University, Ziverbey 34722, Turkey.
Natl Sci Rev. 2023 Dec 8;11(2):nwad305. doi: 10.1093/nsr/nwad305. eCollection 2024 Feb.
The interaction between sites A, B and X with passivation molecules is restricted when the conventional passivation strategy is applied in perovskite (ABX) 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.
当传统的钝化策略应用于钙钛矿（ABX）光伏电池时，A、B位点与X位点与钝化分子之间的相互作用受到限制。幸运的是，旋转的A位点提供了一个通过利用外部场来加强这种相互作用的机会。在此，我们提出了一种实现有序磁偶极矩的新方法，该磁偶极矩通过手性钝化分子与钙钛矿中A位点（甲脒离子）之间的耦合效应由磁场调节。这种策略可以将分子相互作用能提高约四倍，并确保分子排列有序。沉积的钙钛矿薄膜的质量通过抑制非辐射复合得到显著优化。它成功地将光伏器件的开路电压损失降低到360 mV，并将功率转换效率提高到25.22%。这一发现为钙钛矿中A位点的探索提供了新的见解，并为提高钙钛矿光伏器件的性能提供了一条新途径。
