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Reversible Pb 2$\mathplus$ /Pb 0 and I - /I 3 - Redox Chemistry Drives the Light-Induced Phase Segregation in All-Inorganic Mixed Halide Perovskitesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 февраля 2022 г.
- Авторы: Frolova Lyubov A., Luchkin Sergey Y., Lekina Yulia, Gutsev Lavrenty G., Tsarev Sergey A., Zhidkov Ivan S., Kurmaev Ernst Z., Shen Ze Xiang, Stevenson Keith J., Aldoshin Sergey M., Troshin Pavel A.
- Журнал: Advanced Energy Materials
- Том: 11
- Номер: 12
- Год издания: 2021
- Первая страница: 2002934
- DOI: 10.1002/aenm.202002934
- Аннотация: Tunability of optoelectronic properties of lead halide perovskites achievedthrough halide mixing can potentially enable their multiple applications, forexample, in tandem solar cells and light-emitting diodes. However, mixedhalide perovskites are unstable under illumination due to their segregation toBr-rich and I-rich phases, which negatively affects the performance and theoperational stability of devices. Research efforts over the past years provideda substantial understanding of the factors influencing light-induced halidephase segregation. While several mechanisms have been proposed, none ofthem could account for all available experimental data; and hence the originof the effect is still under active debate. Herein, the photodegradation ofCsPbI2Br and Cs1.2PbI2Br1.2 is thoroughly investigated using a set of complementarytechniques. In situ atomic force microscopy provides a visualizationof the real-time halide phase segregation dynamics demonstrating thatiodoplumbate is selectively expelled from the mixed halide perovskite grainsand nucleates as a separate I-rich phase at the grain boundaries. A mechanismbased on the reversible Pb2+/Pb0 and I−/I3− redox (photo)chemistry isproposed, which explains the experimental findings and other previouslyreported results. Furthermore, it sheds new insights on the underlyingmechanisms of multiple phenomena related to light- or electric field-induceddegradation of various lead halide perovskites.
- Добавил в систему: Алдошин Сергей Михайлович