Thermal unequilibrium of strained black CsPbI <sub>3</sub> thin films
Julian A. Steele(KU Leuven), Handong Jin(KU Leuven), Iurii Dovgaliuk(European Synchrotron Radiation Facility), Robert Berger(Western Washington University), Tom Braeckevelt(Ghent University), Haifeng Yuan(University of Toronto), Cristina Martín(University of Castilla-La Mancha), Eduardo Solano(ALBA Synchrotron (Spain)), Kurt Lejaeghere(Ghent University), Sven M. J. Rogge(Ghent University), Charlotte Notebaert(KU Leuven), Wouter Vandezande(KU Leuven), Kris P. F. Janssen(KU Leuven), Bart Goderis(KU Leuven), Elke Debroye(KU Leuven), Ya‐Kun Wang(University of Toronto), Yitong Dong(University of Toronto), Dongxin Ma(University of Toronto), Makhsud I. Saidaminov(University of Toronto), Hairen Tan(University of Toronto), Zheng‐Hong Lu(University of Toronto), Vadim Dyadkin(European Synchrotron Radiation Facility), Dmitry Chernyshov(European Synchrotron Radiation Facility), Véronique Van Speybroeck(Ghent University), Edward H. Sargent(University of Toronto), Johan Hofkens(KU Leuven), Maarten B. J. Roeffaers(KU Leuven)
Cited by 641Open Access
Abstract
Strain-stabilized perovskites The perovskite materials used for solar cells and light-emitting diodes (which are black in color) are generally less stable at room temperature than the electronically inactive nonperovskite phases (which are yellow in color). Steele et al. show that for CsPbI 3 , strain induced in a thin film after annealing the material to 330°C and then rapidly cooling it to room temperature kinetically trapped the black phase. Grazing-incidence wide-angle x-ray scattering revealed the crystal distortions and texture formation created by interfacial strain. Science , this issue p. 679
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