Li Rui, Zhang Shiang, Zhang Hao, Wang Zhiteng, Feng Xiaolong, Du Yachao, Zhou Tianxiang, Chen Xin, Liu Pengchi, Liu Lei, Zhang Junqi, Chen Qiyong, Xi Lili, Zhao Kui, Liu Shengzhong Frank, Tian Qingwen
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 and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119, P. R. China.
Materials Genome Institute, Shanghai University, Shanghai, 200444, P. R. China.
Angew Chem Int Ed Engl. 2024 Oct 14;63(42):e202410600. doi: 10.1002/anie.202410600. Epub 2024 Sep 12.
The characteristics of the soft component and the ionic-electronic nature in all-inorganic CsPbIBr perovskite typically lead to a significant number of halide vacancy defects and ions migration, resulting in a reduction in both photovoltaic efficiency and stability. Herein, we present a tailored approach in which both anion-fixation and undercoordinated-Pb passivation are achieved in situ during crystallization by employing a molecule derived from aniline, specifically 2-methoxy-5-trifluoromethylaniline (MFA), to address the above challenges. The incorporation of MFA into the perovskite film results in a pronounced inhibition of ion migration, a significant reduction in trap density, an enhancement in grain size, an extension of charge carrier lifetime, and a more favorable alignment of energy levels. These advantageous characteristics contribute to achieving a champion power conversion efficiency (PCE) of 22.14 % for the MFA-based CsPbIBr perovskite solar cells (PSCs), representing the highest efficiency reported thus far for this type of inorganic metal halide perovskite solar cells, to the best of our knowledge. Moreover, the resultant PSCs exhibits higher environmental stability and photostability. This strategy is anticipated to offer significant advantages for large-area fabrication, particularly in terms of simplicity.
全无机CsPbIBr钙钛矿中的软成分特性以及离子-电子性质通常会导致大量卤化物空位缺陷和离子迁移，从而降低光伏效率和稳定性。在此，我们提出一种定制方法，通过使用源自苯胺的分子，特别是2-甲氧基-5-三氟甲基苯胺（MFA），在结晶过程中原位实现阴离子固定和低配位Pb钝化，以应对上述挑战。将MFA掺入钙钛矿薄膜可显著抑制离子迁移，大幅降低陷阱密度，增大晶粒尺寸，延长电荷载流子寿命，并使能级排列更有利。这些有利特性有助于基于MFA的CsPbIBr钙钛矿太阳能电池（PSC）实现22.14%的最高功率转换效率（PCE），据我们所知，这是迄今为止此类无机金属卤化物钙钛矿太阳能电池报道的最高效率。此外，所得的PSC表现出更高的环境稳定性和光稳定性。预计该策略在大面积制造方面具有显著优势，特别是在简单性方面。
