高压下有机-无机杂化钙钛矿材料CH_3NH_3PbI_3的结构与光学性质研究
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- 英文论文题名：High-pressure Structural and Optical Properties of Organometal Halide Perovskite CH_3NH_3PbI_3
- 论文作者：王凯 ; 邹勃
- 英文论文作者：Kai Wang ; Bo Zou ; State Key Laboratory of Superhard Materials ; Jilin University
- 年：2016
- 作者机构：吉林大学超硬材料国家重点实验室;
- 论文关键词：高压 ; CH_3NH_3PbI_3 ; 结构相变 ; 带隙 ; 非晶化
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十二分会：有机光伏的机遇和挑战
- 语种：中文
- 分类号：TB33;TM914.4
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十二分会 ; 有机光伏的机遇和挑战
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：271k
- 原文格式：D
- 会议级别：全国
摘要
有机-无机杂化钙钛矿材料作为一种新型的复合晶体材料,因其有机组分与无机组分在分子尺度上的杂化而具有优异的光电性能,在半导体器件尤其钙钛矿太阳能电池等领域具有广阔的应用前景。然而,这类材料对外界环境的变化较为敏感,稳定性问题已经成为制约其发展的瓶颈。压力是独立于温度、化学组分的第三个物理学参量,可以非常有效地改变物质的晶体结构、电子结构和分子间的相互作用。我们利用金刚石对顶砧进行加压,结合各种原位高压测试技术,对典型的有机无机杂化钙钛矿材料CH_3NH_3PbI_3进行了高压结构和性质研究。同步辐射XRD结果表明,CH_3NH_3PbI_3样品在0.3 GPa的压力下发生了一个从四方相到正交相的结构相变;当压力大于4 GPa时,样品随着压力的增加逐步转变为非晶态。拉曼光谱和红外光谱实验结果表明随着压力的增加,有机阳离子和无机框架间的分子间相互作用逐渐增强。我们还利用吸收光谱和荧光光谱对高压下CH_3NH_3PbI_3的带隙变化进行了分析。
Recent advances in highly efficient solar cells based on organometal halide perovskites have triggered intense research efforts to establish the fundamental properties of these materials. In this work, we utilized diamond anvil cells to investigate pressure-induced structural and electronic transformations in methylammonium lead iodide(MAPbI_3) from atmospheric pressure up to 7 GPa at room temperature. Synchrotron X-ray diffraction experiment showed that the sample transformed from the tetragonal phase to the orthorhombic phase at 0.3 GPa and then amorphized at pressures above 4 GPa. Infrared and Raman spectroscopy experiments illustrated the behavior of organic CH_3NH_3~+ cations under high pressure. We further analyzed the pressure dependence of the band gap energy of MAPbI_3 based on its optical absorption and photoluminescence results. All observed changes were fully reversible when the pressure was completely released. Our in situ high-pressure studies provide essential information of the intrinsic properties and stability of organometal halide perovskites.
Recent advances in highly efficient solar cells based on organometal halide perovskites have triggered intense research efforts to establish the fundamental properties of these materials. In this work, we utilized diamond anvil cells to investigate pressure-induced structural and electronic transformations in methylammonium lead iodide(MAPbI_3) from atmospheric pressure up to 7 GPa at room temperature. Synchrotron X-ray diffraction experiment showed that the sample transformed from the tetragonal phase to the orthorhombic phase at 0.3 GPa and then amorphized at pressures above 4 GPa. Infrared and Raman spectroscopy experiments illustrated the behavior of organic CH_3NH_3~+ cations under high pressure. We further analyzed the pressure dependence of the band gap energy of MAPbI_3 based on its optical absorption and photoluminescence results. All observed changes were fully reversible when the pressure was completely released. Our in situ high-pressure studies provide essential information of the intrinsic properties and stability of organometal halide perovskites.
引文
[1]Wang,K.,Liu,R.,Qiao,Y.,Cui,J.,Song,B.,Liu,B.,Zou,B.2015.ar Xiv:1509.03717.