Pressure-Induced Structural Evolution and Band Gap Shifts of Organometal Halide Perovskite-Based Methylammonium Lead Chloride.
Pressure-Induced Structural Evolution and Band Gap Shifts of Organometal Halide Perovskite-Based Methylammonium Lead Chloride.
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DOI：
10.1021/acs.jpclett.6b02420
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Lingrui Wang;Kai Wang;Guanjun Xiao;Q. Zeng;Bo Zou
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文献类型：
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作者：
Lingrui Wang;Kai Wang;Guanjun Xiao;Q. Zeng;Bo Zou
有机金属卤化物钙钛矿是一种很有前途的光电器件材料。这些器件的进一步发展需要深入了解它们的基本结构-性质关系。系统研究了压力对甲基氯化铅铵（MAPbCl 3）晶体结构演化和带隙位移的影响。同步辐射X射线衍射和拉曼实验提供了结构上的收缩，倾斜变形，和原始立方晶胞的非晶化的信息。原位高压光吸收和光致发光光谱表明，MAPbCl 3的带隙可以通过压力微调到紫外区。的光学变化与压力引起的结构演化MAPbCl 3，所证明的带隙位移。Pb-混合钙钛矿和无机八面体之间的比较提供了关于卤素对这些化合物的压力诱导的转变序列的影响的见解。我们的研究结果提高了对有机金属卤化物钙钛矿的结构和光学性质的理解。
Organometal halide perovskites are promising materials for optoelectronic devices. Further development of these devices requires a deep understanding of their fundamental structure-property relationships. The effect of pressure on the structural evolution and band gap shifts of methylammonium lead chloride (MAPbCl3) was investigated systematically. Synchrotron X-ray diffraction and Raman experiments provided structural information on the shrinkage, tilting distortion, and amorphization of the primitive cubic unit cell. In situ high pressure optical absorption and photoluminescence spectra manifested that the band gap of MAPbCl3 could be fine-tuned to the ultraviolet region by pressure. The optical changes are correlated with pressure-induced structural evolution of MAPbCl3, as evidenced by band gap shifts. Comparisons between Pb-hybrid perovskites and inorganic octahedra provided insights on the effects of halogens on pressure-induced transition sequences of these compounds. Our results improve the understanding of the structural and optical properties of organometal halide perovskites.