题目：

Uniform Stepped Interfacial Energy Level Structure Boosts Efficiency and Stability of CsPbI₂Br Solar Cells

作者：

Yu-Xin Luo,^1,+ Feng-Ming Xie,^1,+ Jing-De Chen,^1,* Hao Ren,¹ Jing-Kun Wang,¹ Xiao-Yi Cai,¹ Kong-Chao Shen,¹ Lin-Yang Lu,¹ Yan-Qing Li,^2,* Yuriy N. Luponosov,³ Jian-Xin Tang^1,4,*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM)，Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, China

²School of Physics and Electronic Science, Ministry of Education Nanophotonics & Advanced, Instrument Engineering Research Center, East China Normal University, Shanghai 200062, China

³N. S. Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Moscow 117393, Russian Federation

⁴Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa, Macau SAR 999078, China

摘要：

All-inorganic CsPbI₂Br perovskite has attracted great attention as an absorber for perovskite solar cells (PSCs) due to its excellent thermal and light resistance. However, its device performance is restricted by the large energy level offset between CsPbI₂Br and the most commonly used hole-transporting layer (HTL). Herein, multicarbazolyl-substituted benzonitrile (4t-5CzBn) is inserted into the interface between CsPbI₂Br and HTL to form a uniform stepped (0.24 eV) interfacial energy level structure, which reduces the energy loss and boosts the hole extraction of CsPbI₂Br PSCs. The incorporation of 4t-5CzBn induces the increase in open-circuit voltage and fill factor from 1.256 V and 74.5% to 1.335 V and 82.3%, respectively. The optimized device achieves a power conversion efficiency of 17.34%, which is among the highest reported values of CsPbI₂Br PSCs. Besides the energy level tuning effect, the tert-butyl groups in 4t-5CzBn improve the moisture-resistance of CsPbI₂Br PSCs. The unencapsulated device maintains over 75% of its initiale fficiency after 700 h storage in air. These results demonstrate that the rational tuned energy level step benefits the performance improvement of CsPbI₂Br PSCs.

影响因子：

16.836

分区情况：

一区

链接：

https://doi.org/10.1002/adfm.202103316