Ultralow thermal conductivity in all-inorganic halide perovskites

Controlling the flow of thermal energy is crucial to numerous applications ranging from microelectronic devices to energy storage and energy conversion devices. Here, we report ultralow lattice thermal conductivities of solution-synthesized, single-crystalline all-inorganic halide perovskite nanowir...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 114; no. 33; pp. 8693 - 8697
Main Authors Lee, Woochul, Li, Huashan, Wong, Andrew B., Zhang, Dandan, Lai, Minliang, Yu, Yi, Kong, Qiao, Lin, Elbert, Urban, Jeffrey J., Grossman, Jeffrey C., Yang, Peidong
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 15.08.2017
Proceedings of the National Academy of Sciences
Subjects
Crystals
Devices
Electrical conductivity
Electrical resistivity
Energy conversion
Energy storage
halide perovskite
Heat conductivity
Heat transfer
Hole mobility
MATERIALS SCIENCE
Nanotechnology
nanowire
Nanowires
Perovskite
Perovskites
Physical Sciences
Single crystals
Thermal conductivity
Thermal energy
thermal transport
thermoelectrics
thermoelectrics
thermal conductivity
thermal transport
halide perovskite
nanowire
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Summary:Controlling the flow of thermal energy is crucial to numerous applications ranging from microelectronic devices to energy storage and energy conversion devices. Here, we report ultralow lattice thermal conductivities of solution-synthesized, single-crystalline all-inorganic halide perovskite nanowires composed of CsPbI₃ (0.45 ± 0.05 W·m−1·K−1), CsPbBr₃ (0.42 ± 0.04 W·m−1·K−1), and CsSnI₃ (0.38 ± 0.04 W·m−1·K−1). We attribute this ultralow thermal conductivity to the cluster rattling mechanism, wherein strong optical–acoustic phonon scatterings are driven by a mixture of 0D/1D/2D collective motions. Remarkably, CsSnI₃ possesses a rare combination of ultralow thermal conductivity, high electrical conductivity (282 S·cm−1), and high hole mobility (394 cm²·V−1·s−1). The unique thermal transport properties in all-inorganic halide perovskites hold promise for diverse applications such as phononic and thermoelectric devices. Furthermore, the insights obtained from this work suggest an opportunity to discover low thermal conductivity materials among unexplored inorganic crystals beyond caged and layered structures.
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USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
AC02-05CH11231
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Reviewers: P.K., Harvard University; and Z.R., University of Houston.
Contributed by Peidong Yang, July 8, 2017 (sent for review May 13, 2017; reviewed by Philip Kim and Zhifeng Ren)
Author contributions: W.L., H.L., A.B.W., and P.Y. designed research; W.L., H.L., A.B.W., D.Z., M.L., Y.Y., Q.K., and E.L. performed research; W.L., H.L., and A.B.W. analyzed data; and W.L., H.L., A.B.W., J.J.U., J.C.G., and P.Y. wrote the paper.
1W.L., H.L., and A.B.W. contributed equally to this work.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1711744114