Open AccessOne‐Step Thermal Gradient‐ and Antisolvent‐Free Crystallization of All‐Inorganic Perovskites for Highly Efficient and Thermally Stable Solar Cells
Author(s) -
Byranvand Mahdi Malekshahi,
Kodalle Tim,
Zuo Weiwei,
Magorian Friedlmeier Theresa,
Abdelsamie Maged,
Hong Kootak,
Zia Waqas,
Perween Shama,
Clemens Oliver,
SutterFella Carolin M.,
Saliba Michael
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202202441
Subject(s) - materials science , crystallization , crystallinity , thermal stability , chemical engineering , annealing (glass) , grain size , perovskite (structure) , spin coating , photovoltaic system , solar cell , nanotechnology , thin film , optoelectronics , composite material , engineering , ecology , biology
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, CsPbI 2 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 CsPbI 2 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 ( V OC ) of 1.27 V. Moreover, excellent phase and thermal stability are demonstrated even after extreme thermal stressing at 300 °C.