1. One‐Step Thermal Gradient‐ and Antisolvent‐Free Crystallization of All‐Inorganic Perovskites for Highly Efficient and Thermally Stable Solar Cells
- Author
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Byranvand, Malekshahi, Kodalle, Tim, Zuo, Weiwei, Friedlmeier, Theresa Magorian, Abdelsamie, Maged, Hong, Kootak, Zia, Waqas, Perween, Shama, Clemens, Oliver, Sutter‐Fella, Carolin M, and Saliba, Michael
- Subjects
Macromolecular and Materials Chemistry ,Chemical Sciences ,Physical Chemistry ,Engineering ,Materials Engineering ,all-inorganic perovskites ,crystallization ,CsPbI2Br ,in situ characterization ,MSD - Abstract
All-inorganic perovskites have emerged as promising photovoltaic materials due to their superior thermal stability compared to their heat-sensitive hybrid organic-inorganic counterparts. In particular, CsPbI2 Br shows the highest potential for developing thermally-stable perovskite solar cells (PSCs) among all-inorganic compositions. However, controlling the crystallinity and morphology of all-inorganic compositions is a significant challenge. Here, a simple, thermal gradient- and antisolvent-free method is reported to control the crystallization of CsPbI2 Br films. Optical in situ characterization is used to investigate the dynamic film formation during spin-coating and annealing to understand and optimize the evolving film properties. This leads to high-quality perovskite films with micrometer-scale grain sizes with a noteworthy performance of 17% (≈16% stabilized), fill factor (FF) of 80.5%, and open-circuit voltage (VOC ) of 1.27 V. Moreover, excellent phase and thermal stability are demonstrated even after extreme thermal stressing at 300 °C.
- Published
- 2022