期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 33, 页码 8693-8697出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1711744114
关键词
halide perovskite; thermal conductivity; thermal transport; nanowire; thermoelectrics
资金
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231, KC3103]
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under US Department of Energy [DE-AC02- 05CH11231]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the US Department of Energy [DE-AC02-05CH11231]
- Lam Research Fellowship
- Suzhou Industrial Park
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, singlecrystalline 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 cm(2).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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