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Cation Dynamics Governed Thermal Properties of Lead Halide Perovskite Nanowires
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1021/acs.nanolett.7b04437 Yuxi Wang 1 , Renxing Lin 1 , Pengchen Zhu 1 , Qinghui Zheng 1 , Qianjin Wang 1 , Deyu Li 2 , Jia Zhu 1
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1021/acs.nanolett.7b04437 Yuxi Wang 1 , Renxing Lin 1 , Pengchen Zhu 1 , Qinghui Zheng 1 , Qianjin Wang 1 , Deyu Li 2 , Jia Zhu 1
Affiliation
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Metal halide perovskite (MHP) nanowires such as hybrid organic–inorganic CH3NH3PbX3 (X = Cl, Br, I) have drawn significant attention as promising building blocks for high-performance solar cells, light-emitting devices, and semiconductor lasers. However, the physics of thermal transport in MHP nanowires is still elusive even though it is highly relevant to the device thermal stability and optoelectronic performance. Through combined experimental measurements and theoretical analyses, here we disclose the underlying mechanisms governing thermal transport in three different kinds of lead halide perovskite nanowires (CH3NH3PbI3, CH3NH3PbBr3 and CsPbBr3). It is shown that the thermal conductivity of CH3NH3PbBr3 nanowires is significantly suppressed as compared to that of CsPbBr3 nanowires, which is attributed to the cation dynamic disorder. Furthermore, we observed different temperature-dependent thermal conductivities of hybrid perovskites CH3NH3PbBr3 and CH3NH3PbI3, which can be attributed to accelerated cation dynamics in CH3NH3PbBr3 at low temperature and the combined effects of lower phonon group velocity and higher Umklapp scattering rate in CH3NH3PbI3 at high temperature. These data and understanding should shed light on the design of high-performance MHP based thermal and optoelectronic devices.
中文翻译：
阳离子动力学控制的卤化钙钛矿纳米线的热性能
金属卤化物钙钛矿（MHP）纳米线，例如有机-无机杂化CH 3 NH 3 PbX 3（X = Cl，Br，I）杂物作为高性能太阳能电池，发光器件和半导体的有前途的构建基块备受关注激光。然而，尽管MHP纳米线中的热传输物理学与器件的热稳定性和光电性能高度相关，但仍然难以捉摸。通过组合的实验测量和理论分析，在这里我们揭示了控制三种不同类型的卤化钙铅钛矿纳米线（CH 3 NH 3 PbI 3，CH 3 NH 3PbBr 3和CsPbBr 3）。结果表明，CH的热传导率3 NH 3 PbBr 3相比于CsPbBr的纳米线被显著抑制3纳米线，这归因于阳离子动态病症。此外，我们观察到混合钙钛矿的不同依赖于温度的热导率CH 3 NH 3 PbBr 3和CH 3 NH 3碘化铅3，其可以在CH归因于加速阳离子动力学3 NH 3 PbBr 3CH 3 NH 3 PbI 3中的较低声子基团速度和较高的Umklapp散射速率共同作用的结果。这些数据和理解应该为基于MHP的高性能热和光电设备的设计提供启发。
更新日期：2018-04-04
中文翻译：
阳离子动力学控制的卤化钙钛矿纳米线的热性能
金属卤化物钙钛矿（MHP）纳米线，例如有机-无机杂化CH 3 NH 3 PbX 3（X = Cl，Br，I）杂物作为高性能太阳能电池，发光器件和半导体的有前途的构建基块备受关注激光。然而，尽管MHP纳米线中的热传输物理学与器件的热稳定性和光电性能高度相关，但仍然难以捉摸。通过组合的实验测量和理论分析，在这里我们揭示了控制三种不同类型的卤化钙铅钛矿纳米线（CH 3 NH 3 PbI 3，CH 3 NH 3PbBr 3和CsPbBr 3）。结果表明，CH的热传导率3 NH 3 PbBr 3相比于CsPbBr的纳米线被显著抑制3纳米线，这归因于阳离子动态病症。此外，我们观察到混合钙钛矿的不同依赖于温度的热导率CH 3 NH 3 PbBr 3和CH 3 NH 3碘化铅3，其可以在CH归因于加速阳离子动力学3 NH 3 PbBr 3CH 3 NH 3 PbI 3中的较低声子基团速度和较高的Umklapp散射速率共同作用的结果。这些数据和理解应该为基于MHP的高性能热和光电设备的设计提供启发。
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