Thermal unequilibrium of strained black CsPbI 3 thin films

• DOI: 10.1126/science.aax3878
• Publication Date: 2019-07-25T22:59:10Z
• Authors: Julian A. Steele; Handong Jin; Iurii Dovgaliuk; Robert F. Berger; Tom Braeckevelt; Haifeng Yuan; Cristina Martin; Eduardo Solano; Kurt Lejaeghere; Sven M. J. Rogge; Charlotte Notebaert; Wouter Vandezande; Kris P. F. Janssen; Bart Goderis; Elke Debroye; Ya-Kun Wang; Yitong Dong; Dongxin Ma; Makhsud Saidaminov; Hairen Tan; Zhenghong Lu; Vadim Dyadkin; Dmitry Chernyshov; Veronique Van Spe...; Edward H. Sargent; Johan Hofkens; Maarten B. J. Roe...
• Keywords: Technology and Engineering; Multidisciplinary; EFFICIENCY; STABILITY; PEROVSKITE; TOTAL-ENERGY CALCULATIONS; CESIUM; 01 natural sciences; 0104 chemical sciences; ALPHA-CSPBI3; CELLS; FORMAMIDINIUM; TOLERANCE; TRIHALIDE

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