Photostriction of CH3NH3PbBr3 Perovskite Crystals |
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Authors: | Tzu‐Chiao Wei Hsin‐Ping Wang Ting‐You Li Chun‐Ho Lin Ying‐Hui Hsieh Ying‐Hao Chu Jr‐Hau He |
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Affiliation: | 1. Computer, Electrical, and Mathematical Sciences and Engineering Division, King Abdullah University of Science & Technology, Thuwal, Saudi Arabia;2. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan |
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Abstract: | Organic–inorganic hybrid perovskite materials exhibit a variety of physical properties. Pronounced coupling between phonon, organic cations, and the inorganic framework suggest that these materials exhibit strong light–matter interactions. The photoinduced strain of CH3NH3PbBr3 is investigated using high‐resolution and contactless in situ Raman spectroscopy. Under illumination, the material exhibits large blue shifts in its Raman spectra that indicate significant structural deformations (i.e., photostriction). From these shifts, the photostrictive coefficient of CH3NH3PbBr3 is calculated as 2.08 × 10?8 m2 W?1 at room temperature under visible light illumination. The significant photostriction of CH3NH3PbBr3 is attributed to a combination of the photovoltaic effect and translational symmetry loss of the molecular configuration via strong translation–rotation coupling. Unlike CH3NH3PbI3, it is noted that the photostriction of CH3NH3PbBr3 is extremely stable, demonstrating no signs of optical decay for at least 30 d. These results suggest the potential of CH3NH3PbBr3 for applications in next‐generation optical micro‐electromechanical devices. |
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Keywords: | CH3NH3PbBr3 perovskites photostriction Raman |
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