Prof. Mingkui Wang, Huazhong University of Science and Technology, China.
Huazhong University of Science and Technology,
China.
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.
Co-authors
Mingkui Wanga,b,*, Tao Zhangb, Huaxia Banb, Qiang Sunb, Zhiguo Zhangb
(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.
Biography
Mingkui Wang is an electrochemist who works in a range of energy and environmental problems. He received his PhD degree in 2005 from the Chinese Academy of Science and joined the group of Prof. Ulrich Stimming as an Alexander von Humboldt Fellow at the Technische Universität at München. He then joined Prof. Michael Grätzel’s group at the Swiss Federal Institute of Technology Lausanne as a post-doctoral fellow. Since 2010 he has been a professor at the Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology. From 2016-2017, he worked as visiting professor to Prof. Yang Yang’s group at the UCLA, USA. His research interests include the development of nanostructured solar cells and the application of electrochemistry to the elucidation of fundamental phenomena in photonics. His work has obtained over 18000 citations so far with an h-index of 66. Mingkui served as Associate Editor for RSC Advances from 2015-2017, member of editorial advisory board for Frontier of Optoelectronics, Scientific Reports, and reviewers for journals including Solar Energy. His research interests include the development of next-generation solar cells and the application of electrochemistry to the elucidation of fundamental phenomena in photonics. He was ranked for the energy scientists list in a recently published top-100 Chinese scientist list of decade by Thomson Reuters (2015-2020), the 2019 Highly Cited Researchers list from the Clarivate.