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Download fileCation Dynamics Governed Thermal Properties of Lead Halide Perovskite Nanowires
journal contribution
posted on 2018-04-04, 00:00 authored by Yuxi Wang, Renxing Lin, Pengchen Zhu, Qinghui Zheng, Qianjin Wang, Deyu Li, Jia ZhuMetal
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.
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phonon group velocitybuilding blocksoptoelectronic devicesCH 3 NH 3 PbBr 3 nanowireshalide perovskite nanowirescation dynamicsoptoelectronic performanceCH 3 NH 3 PbBr 3CsPbBr 3 nanowiresCH 3 NH 3 PbI 3CsPbBr 3light-emitting devicesMHP nanowiressemiconductor lasersperovskites CH 3 NH 3 PbBr 3Thermal PropertiesCation DynamicsLead Halide Perovskite Nanowires Metal halide perovskite