Double Side Interfacial Optimization for Low-Temperature Stable CsPbI 2 Br Perovskite Solar Cells with High Efficiency Beyond 16%

Energy & Environmental Materials

article

Jing Ma¹  Jie Su¹  Zhenhua Lin¹  Jian He¹  Long Zhou¹  Tao Li²  Jincheng Zhang¹  Shengzhong Liu⁴  Jingjing Chang¹  Yue Hao¹ 

[1] State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University;Centre for Spintronics and Quantum System, State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University;Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University;Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University

关键词: CsPbI2Br;    dual interfacial optimization;    high performance;    low temperature;    perovskite solar cells;   

DOI  :  10.1002/eem2.12212

来源: Wiley

【 摘 要 】

CsPbI 2 Br perovskite solar cells have achieved rapid development owing to their exceptional optoelectronic properties and relatively outstanding stability. However, open-circuit voltage ( V oc ) loss caused by band mismatch and charge recombination between perovskite and charge transporting layer is one of the crucial obstacles to further improve the device performance. Here, we proposed a bilayer electron transport layer ZnO(bottom)/SnO 2 (top) to reduce the V oc loss ( E loss ) and promote device V oc by ZnO insert layer thickness modulation, which could improve the efficiency of charge carrier extraction/transfer and suppress the charge carrier recombination. In addition, guanidinium iodide top surface treatment is used to further reduce the trap density, stabilize the perovskite film and align the energy levels, which promotes the fill factor, short-circuit current density ( J sc ), and stability of the device. As a result, the champion cell of double-side optimized CsPbI 2 Br perovskite solar cells exhibits an extraordinary efficiency of 16.25% with the best V oc as high as 1.27 V and excellent thermal and storage stability.

【 授权许可】

Unknown