One-Step Thermal Gradient-Free Crystallization method for Highly Efficient and Thermally Stable All-Inorganic Perovskite Solar Cells
Mahdi Malekshahi Byranvand a g, Tim Kodalle b, Weiwei Zuo a, Theresa Magorian Friedlmeier c, Maged Abdelsamie d, Kootak Hong e, Waqas Zia a g, Shama Perween f, Oliver Clemens f, Carolin M. Sutter-Fella b, Michael Saliba a g
a Institute for Photovoltaics (ipv), University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany
b Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, 94720 California, USA
c Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70563 Stuttgart, Germany
d Materials Sciences Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, 94720 California, USA
e Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, 94720 California, USA
f Institute for Materials Science, Chemical Materials Synthesis, University of Stuttgart, Stuttgart
g Helmholtz Young Investigator Group, lEK5-Photovoltaik, Forschungszentrum Jülich, 52425 Jülich, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Mahdi Malekshahi Byranvand, presentation 033
Publication date: 20th April 2022

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, CsPbI2Br 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 CsPbI2Br 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 micron-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. It should be mentioned that our achievement is one of the highest reported PCEs for All-inorganic PCSs with the bandgap of ~ 1.9 eV. Moreover, excellent phase and thermal stability are demonstrated even after extreme thermal stressing at 300 °C.

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