Journal
SCIENCE
Volume 365, Issue 6454, Pages 679-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax3878
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Funding
- Research Foundation-Flanders (FWO) [G.0B39.15, G098319N]
- FWO postdoctoral fellowships [12Y7218N, 12J1716N, 12R8718N, 12C2817N, 12O3719N, 12O0117N, 12T3519N]
- KU Leuven Research Fund [C14/15/053]
- Flemish government through long-term structural funding Methusalem (CASAS2) [Meth/15/04)]
- Hercules Foundation [HER/11/14]
- Belgian Federal Science Policy Office [IAP-VII/05]
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant [307523 LIGHT]
- European Union (ERC) [647755]
- FWO
- SB-FWO fellowship [1SC1319]
- European Research Council (ERC) [647755] Funding Source: European Research Council (ERC)
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The high-temperature, all-inorganic CsPbI3 perovskite black phase is metastable relative to its yellow, nonperovskite phase at room temperature. Because only the black phase is optically active, this represents an impediment for the use of CsPbI3 in optoelectronic devices. We report the use of substrate clamping and biaxial strain to render black-phase CsPbI3 thin films stable at room temperature. We used synchrotron-based, grazing incidence, wide-angle x-ray scattering to track the introduction of crystal distortions and strain-driven texture formation within black CsPbI3 thin films when they were cooled after annealing at 330 degrees C. The thermal stability of black CsPbI3 thin films is vastly improved by the strained interface, a response verified by ab initio thermodynamic modeling.
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