期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 10, 期 8, 页码 606-612出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201600156
关键词
hybrid materials; perovskites; laser ultrasonics; elastic properties; CH3NH3PbBr3
资金
- National Natural Science Foundation of China [11274175, 61574078]
- High-end Foreign Experts Recruitment Program of China
- LMAc LAUM
The results of the direct experimental evaluation of all elastic constants of single crystal hybrid organic-inorganic perovskite (HOIP) methylammonium lead bromide, a material known due to its possible solar-energy, optoelectronics, X-ray detector and thermoelectricity applications, are reported. The measurements of anisotropic elasticity of CH3NH3PbBr3 by the technique of laser ultrasonics demonstrate that properties of HOIPs can be even more remarkable than the theoretical expectations: the extracted shear modulus is more than twice smaller, the universal anisotropy is more than twice higher, while the Debye temperature is more than 50 degrees lower. Thus HOIPs can exhibit extremely low shear rigidity and extremely high anisotropy, both strongly overrunning the parameters which have been expected based on earlier first principles theoretical predictions. A simple theoretical model of granular crystal indicates that these observations could be related to the contributions of rotations/tilts of PbBr6 octahedra to elastic response of cubic CH3NH3PbBr3. Another experimental observation is strong stiffening of shear rigidity with temperature increase from its room value up to 120 degrees C. Discovered elastic properties of HOIPs characterize them as exceptionally ductile/flexible/adaptive materials which could be deposited on corrugated/structured surfaces. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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