Surface modification of CsPbI2Br perovskite film with an organic ammonium salt for efficient photovoltaics

Ze Wang; Xinyu Tang; Li Liu; Xianghua Yao; Yonghao Zheng; Xiaodong Liu

doi:10.1117/12.2648573

14 October 2022 Surface modification of CsPbI₂Br perovskite film with an organic ammonium salt for efficient photovoltaics

Ze Wang, Xinyu Tang, Li Liu, Xianghua Yao, Yonghao Zheng, Xiaodong Liu

Author Affiliations +

Proceedings Volume 12343, 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022); 123430B (2022) https://doi.org/10.1117/12.2648573
Event: 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022), 2022, Qingdao, China

Abstract

To date, the best efficiency of organic-inorganic hybrid perovskite solar cells (PSCs) has reached 25.7%, but the volatile nature of organic compounds at high temperature results in their poor thermal stability. All-inorganic perovskites such as CsPbI₂Br, possess excellent thermal stability, but the power conversion efficiency (PCE) of CsPbI₂Br PSCs still lag far behind their organic-inorganic perovskite counterparts. To enhance the PCE of CsPbI₂Br PSCs, an organic ammonium salt, namely benzylamine hydroiodide (BZAI) has been adopted to modify the surface of CsPbI₂Br films. The BZA⁺ can interact with Iˉ and Brˉ on the surface of CsPbI₂Br film to passivate perovskite surface defects. In addition, the BZAI interfacial layer can finely adjust the energy levels of CsPbI₂Br perovskite to match with the hole transporting layer (HTL), and thus reduce the charge recombination at the perovskite/HTL interface. Finally, the PCE of the devices is notably increased from 12.87% to 15.08% after introducing the BZAI interfacial layer, and the device stability in nitrogen environment is also improved.

Citation Download Citation

Ze Wang, Xinyu Tang, Li Liu, Xianghua Yao, Yonghao Zheng, and Xiaodong Liu "Surface modification of CsPbI₂Br perovskite film with an organic ammonium salt for efficient photovoltaics", Proc. SPIE 12343, 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022), 123430B (14 October 2022); https://doi.org/10.1117/12.2648573

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KEYWORDS

Bromine

Perovskite

Natural surfaces

Photovoltaics

Solar energy

Chemical species

Interfaces

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