Pressure-Induced Phase Transition and Band Gap Engineering in Propylammonium Lead Bromide Perovskite 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
The journal of physical chemistry, C. Nanomaterials and interfaces
年/卷/期
2019 / 123 / 24
页码
15204-15208
ISSN号
1932-7447
作者单位
Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China;Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;Ctr High Pressure Sci & Technol Adv Res HPSTAR, Shanghai 201203, Peoples R China;Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China;
作者
Ren, Xiangting;Yan, Xiaozhi;Ahmad, Azkar Saeed;Cheng, Hu;Li, Yanchun;Zhao, Yusheng;Wang, Lin;Wang, Shanmin;
摘要
Organometal halide perovskites offer tremendous potential in developing optoelectronic and photovoltaic devices because of their spectacular band gap properties. Pressure has been demonstrated to be able to modulate their band gap in the energy range of visible spectrum, except in the high-energy region of similar to 2.5-3.0 eV. In this work, we present a high-pressure study of propylammonium lead bromide perovskite and reveal that the band gap can be tuned between the energy of violet light and yellow light (similar to 3.0-2.2 eV) by pressure. Upon compression, the band gap of this material is progressively altered from similar to 3.0 eV at ambient pressure to 2.28 eV at 9.5 GPa. At a relatively low pressure of 1.3 GPa, a triclinic-to-monoclinic structural transition is also observed with a similar to 4.7% band gap reduction. Interestingly, in the pressure range of 9.5-20 GPa, the amorphization of the material leads to an anomalously enlarged band gap as a result of the disorder of organic cations, the slightly distorted [PbBr6](4) octahedra. The variation of band gap of this perovskite at high pressures is explored to be closely attributed to the lattice density and octahedra distortion of amorphous phase. Findings of this work demonstrate that the band gap of organometal perovskites realizes the first redshift from the violet to visible region through the control of lattice parameter and crystal symmetry at high pressures, providing potential communication and sensing devices ranging from violet to yellow at high pressures. Our results also improve the understanding of the structures and properties of organometal halide perovskites.
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