Lead-less perovskite solar cells-from molecular to device
Mingkui Wang a b, Tao Zhang b, Huaxia Ban b, Qiang Sun b, Zhiguo Zhang b
a China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, P. R. China
b 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
Invited Speaker, Mingkui Wang, presentation 026
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.026
Publication date: 4th December 2020

Photovoltaics using organic-inorganic hybrid lead perovskites have shown competitive power conversion efficiency. However, a large-scale application of perovskite solar cells needs to solve issues of the chemical instability of organic-inorganic hybrid perovskites, as well as the toxicity of lead (Pb) contaminants. In this presentation, we discussed the lead less perovskite, especially the Sn/Pb binary metal inorganic perovskite, for efficient and stable photovoltaic application. For example, we will discuss an effective method for stabilizing CsPb0.5Sn0.5I2Br via antioxidant tea polyphenol. We experimentally found tea polyphenol can not only slow down the oxidation of Sn2+, but also regulate perovskite film crystallization during the formation of perovskite film via coordination interaction, leading to a reduced density of defects and an enlarged open-circuit voltage. Furthermore, we will discuss a chemical doping agent of cobaltocene (denoted CoCp2) with strong electron-donating ability for the first time as stabilizer and electrical property manipulator to inorganic CsSnI3 perovskite compound for photovoltaic application. Such a thermal-driven electron injection from CoCp2 into CsSnI3 maintains a reducing environment and thereby effectively suppresses the Sn2+ oxidation (named after remote reduction), which can be confirmed by an increase in the density of states near the Fermi level and an emerging of oxidized species cobaltocenium (CoCp2+). Incorporating donor elements offers a novel and viable strategy to develop stable Sn-based inorganic PSCs with attractive properties for practical applications.



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