Ultralow thermal conductivity of two-dimensional metal halide perovskites

Ashutosh Giri; Alexander Z. Chen; Alessandro Mattoni; Kiumars Aryana; Depei Zhang; Xiao Hu; Seung Hun Lee; Joshua J. Choi; Patrick E. Hopkins

doi:10.1021/acs.nanolett.0c00214

Ultralow thermal conductivity of two-dimensional metal halide perovskites

Ashutosh Giri, Alexander Z. Chen, Alessandro Mattoni, Kiumars Aryana, Depei Zhang, Xiao Hu, Seung Hun Lee, Joshua J. Choi, Patrick E. Hopkins

Research output: Contribution to journal › Article › peer-review

89 Scopus citations

Abstract

We report on the thermal conductivities of two-dimensional metal halide perovskite films measured by time domain thermoreflectance. Depending on the molecular substructure of ammonium cations and owing to the weaker interactions in the layered structures, the thermal conductivities of our two-dimensional hybrid perovskites range from 0.10 to 0.19 W m^-1 K^-1, which is drastically lower than that of their three-dimensional counterparts. We use molecular dynamics simulations to show that the organic component induces a reduction of the stiffness and sound velocities along with giving rise to vibrational modes in the 5-15 THz range that are absent in the three-dimensional counterparts. By systematically studying eight different two-dimensional hybrid perovskites, we show that the thermal conductivities of our hybrid films do not depend on the thicknesses of the organic layers and instead are highly dependent on the relative orientation of the organic chains sandwiched between the inorganic constituents.

Original language	English
Pages (from-to)	3331-3337
Number of pages	7
Journal	Nano Letters
Volume	20
Issue number	5
DOIs	https://doi.org/10.1021/acs.nanolett.0c00214
State	Published - May 13 2020
Externally published	Yes

Funding

This work is based upon work supported by the Air Force Office of Scientific Research under Award No. FA9550-18-1-0352 A.M. acknowledges Italian MIUR for project PON04a2 00490 M2M Netergit and PRACE for awarding access to Marconi KNL at CINECA, Italy, through project DECONVOLVES (2018184466). J.J.C. and S.-H.L. acknowledge support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0016144.

Keywords

Heat capacity
Thermal conductivity
Time domain thermoreflectance
Two-dimensional metal halide perovskite

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10.1021/acs.nanolett.0c00214

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title = "Ultralow thermal conductivity of two-dimensional metal halide perovskites",

abstract = "We report on the thermal conductivities of two-dimensional metal halide perovskite films measured by time domain thermoreflectance. Depending on the molecular substructure of ammonium cations and owing to the weaker interactions in the layered structures, the thermal conductivities of our two-dimensional hybrid perovskites range from 0.10 to 0.19 W m-1 K-1, which is drastically lower than that of their three-dimensional counterparts. We use molecular dynamics simulations to show that the organic component induces a reduction of the stiffness and sound velocities along with giving rise to vibrational modes in the 5-15 THz range that are absent in the three-dimensional counterparts. By systematically studying eight different two-dimensional hybrid perovskites, we show that the thermal conductivities of our hybrid films do not depend on the thicknesses of the organic layers and instead are highly dependent on the relative orientation of the organic chains sandwiched between the inorganic constituents.",

keywords = "Heat capacity, Thermal conductivity, Time domain thermoreflectance, Two-dimensional metal halide perovskite",

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doi = "10.1021/acs.nanolett.0c00214",

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T1 - Ultralow thermal conductivity of two-dimensional metal halide perovskites

AU - Giri, Ashutosh

AU - Chen, Alexander Z.

AU - Mattoni, Alessandro

AU - Aryana, Kiumars

AU - Zhang, Depei

AU - Hu, Xiao

AU - Lee, Seung Hun

AU - Choi, Joshua J.

AU - Hopkins, Patrick E.

PY - 2020/5/13

Y1 - 2020/5/13

N2 - We report on the thermal conductivities of two-dimensional metal halide perovskite films measured by time domain thermoreflectance. Depending on the molecular substructure of ammonium cations and owing to the weaker interactions in the layered structures, the thermal conductivities of our two-dimensional hybrid perovskites range from 0.10 to 0.19 W m-1 K-1, which is drastically lower than that of their three-dimensional counterparts. We use molecular dynamics simulations to show that the organic component induces a reduction of the stiffness and sound velocities along with giving rise to vibrational modes in the 5-15 THz range that are absent in the three-dimensional counterparts. By systematically studying eight different two-dimensional hybrid perovskites, we show that the thermal conductivities of our hybrid films do not depend on the thicknesses of the organic layers and instead are highly dependent on the relative orientation of the organic chains sandwiched between the inorganic constituents.

AB - We report on the thermal conductivities of two-dimensional metal halide perovskite films measured by time domain thermoreflectance. Depending on the molecular substructure of ammonium cations and owing to the weaker interactions in the layered structures, the thermal conductivities of our two-dimensional hybrid perovskites range from 0.10 to 0.19 W m-1 K-1, which is drastically lower than that of their three-dimensional counterparts. We use molecular dynamics simulations to show that the organic component induces a reduction of the stiffness and sound velocities along with giving rise to vibrational modes in the 5-15 THz range that are absent in the three-dimensional counterparts. By systematically studying eight different two-dimensional hybrid perovskites, we show that the thermal conductivities of our hybrid films do not depend on the thicknesses of the organic layers and instead are highly dependent on the relative orientation of the organic chains sandwiched between the inorganic constituents.

KW - Heat capacity

KW - Thermal conductivity

KW - Time domain thermoreflectance

KW - Two-dimensional metal halide perovskite

UR - https://www.scopus.com/pages/publications/85084694250

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DO - 10.1021/acs.nanolett.0c00214

M3 - Article

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AN - SCOPUS:85084694250

SN - 1530-6984

VL - 20

SP - 3331

EP - 3337

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

Ultralow thermal conductivity of two-dimensional metal halide perovskites

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Keywords

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