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Optical Behaviors of a Microsized Single-Crystal MAPbI3 Plate under High Pressure
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-12-05 , DOI: 10.1021/acs.jpcc.9b10416 Chang Liu 1 , Zhongqi Li 1 , Liu Yang 1 , Xiuru Yao 1 , Hongqi Li 1 , Xinxia Liu 1 , Yongsheng Zhao 1 , Pinwen Zhu 1 , Tian Cui 1 , Cheng Sun 2 , Yongjun Bao 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-12-05 , DOI: 10.1021/acs.jpcc.9b10416 Chang Liu 1 , Zhongqi Li 1 , Liu Yang 1 , Xiuru Yao 1 , Hongqi Li 1 , Xinxia Liu 1 , Yongsheng Zhao 1 , Pinwen Zhu 1 , Tian Cui 1 , Cheng Sun 2 , Yongjun Bao 1
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The correlation between the crystal structure and the optoelectrical property of methylammonium lead iodide (MAPbI3) is investigated by measuring the optical absorption and the photoluminescence spectra of a microsized single-crystal MAPbI3 plate (MSCMP) up to 20.43 GPa with confocal μ-spectroscopy. The pressure-induced phase transitions of an MSCMP are identified by the absorption edges of the absorption spectrum and the fluorescence peaks of the PL spectrum. A tetragonal–cubic phase transition is confirmed under a pressure within the range of 0.23 to 0.46 GPa. The optical property of the cubic phase is dominated by the competition between Pb–I bond contraction and PbI6 octahedron tilt up to 2.72 GPa. Furthermore, the MAPbI3 plate experiences an isostructural cubic phase transition with a unique optical behavior below 3.90 GPa. Little amount of nonradiative high-pressure phase presents a radiative emission mixed with a radiative low-pressure phase, which originates from the diffusion and recombination of excitons within the mixed-phase state. Finally, the reversibility is evaluated by comparing the absorption and PL spectra while the samples are compressed before and after 4.17 and 20.43 GPa, respectively. These results help us to understand the pressure-induced phase transition and the electron–hole recombination mechanism of MAPbI3 under high pressure in detail. It provides us a new perspective to engineer and optimize the optoelectrical devices of high performance based on organic–inorganic hybrid metal halide perovskite.
中文翻译：
超高压单晶MAPbI 3平板在高压下的光学行为
通过共焦μ谱法测量高达20.43 GPa的微单晶MAPbI 3平板（MSCMP）的光吸收和光致发光光谱，研究了甲基铵碘化铅（MAPbI 3）的晶体结构与光电性能之间的相关性。。MSCMP的压力诱导相变由吸收光谱的吸收边缘和PL光谱的荧光峰识别。在0.23至0.46 GPa的压力范围内确认了四方立方相变。立方相的光学性质主要受Pb–I键收缩和PbI 6八面体倾斜（高达2.72 GPa）之间的竞争的影响。此外，MAPbI 3板经历了3.90 GPa以下的独特光学行为的同构立方相变。少量的非辐射高压相呈现出与辐射低压相混合的辐射发射，其源于混合相状态下激子的扩散和复合。最后，通过比较分别在4.17和20.43 GPa之前和之后压缩的样品的吸收光谱和PL光谱来评估可逆性。这些结果有助于我们详细了解在高压下压力诱导的相变和MAPbI 3的电子-空穴复合机理。它为我们设计和优化基于有机-无机混合金属卤化物钙钛矿的高性能光电器件提供了新的视角。
更新日期：2019-12-06
中文翻译：
超高压单晶MAPbI 3平板在高压下的光学行为
通过共焦μ谱法测量高达20.43 GPa的微单晶MAPbI 3平板（MSCMP）的光吸收和光致发光光谱，研究了甲基铵碘化铅（MAPbI 3）的晶体结构与光电性能之间的相关性。。MSCMP的压力诱导相变由吸收光谱的吸收边缘和PL光谱的荧光峰识别。在0.23至0.46 GPa的压力范围内确认了四方立方相变。立方相的光学性质主要受Pb–I键收缩和PbI 6八面体倾斜（高达2.72 GPa）之间的竞争的影响。此外，MAPbI 3板经历了3.90 GPa以下的独特光学行为的同构立方相变。少量的非辐射高压相呈现出与辐射低压相混合的辐射发射，其源于混合相状态下激子的扩散和复合。最后，通过比较分别在4.17和20.43 GPa之前和之后压缩的样品的吸收光谱和PL光谱来评估可逆性。这些结果有助于我们详细了解在高压下压力诱导的相变和MAPbI 3的电子-空穴复合机理。它为我们设计和优化基于有机-无机混合金属卤化物钙钛矿的高性能光电器件提供了新的视角。
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