Stabilization of Inorganic CsPb0.5Sn0.5I2Br Perovskite Compounds by Antioxidant Tea Polyphenol
Huaxia Ban a
a Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, P.R. China
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Poster, Huaxia Ban, 043
Publication date: 4th December 2020

Implementation of inorganic perovskite compounds and reduction toxicity of lead are important for developing sustainable and renewable photovoltaic power generation. The inorganic Pb/Sn binary metal halide perovskites offer a perfect opportunity for tuning optical bandgap and thus hold significant potential in emerging technologies such as solar cells. However, an easy oxidation of Sn2+ to Sn4+ has become one of the main issues for achieving efficient and stable Snbased perovskite solar cells (PSCs). Herein, an effective method for stabilizing CsPb0.5Sn0.5I2Br is proposed to realize high-efficiency PSCs via antioxidant tea polyphenol (TP). It is found that TP can not only slow down the oxidation of Sn2+ but also regulate perovskite film crystallization during the formation of perovskite films via coordination interaction, leading to a reduced density of defects and an enlarged open-circuit voltage. The resultant perovskite solar cell using CsPb0.5Sn0.5I2Br (TP) with an all-inorganic mesoscopic framework of FTO/ c-TiO2/m-TiO2/Al2O3/NiO/carbon achieves an impressive power conversion efficiency of 8.10% with high stability.

Financial support from the National Key Research and Development Program of China (2018YFB1502900), National Natural Science Foundation of China Major International (Regional) Joint Research Project (nos. 51661135023 and 51961165106), and National Natural Science Foundation of China (nos. 21673091 and 21975088) are acknowledged. This project was also funded by the Fundamental Research Funds for the Central Universities (2018KFYXKJC034 and 2019kfyRCPY040) and the double first-class research funding of China-EU Institute for Clean and Renewable Energy (3011187029). The authors thank the Analytical and Testing Centre of Huazhong University of Science & Technology and the Nano-devices and Characterization Centre of WNLO-HUST for the measurements of the samples.

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