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Issue 2, 2021

Origins of pressure-induced enhancement in thermal conductivity of hybrid inorganic–organic perovskites

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Abstract

Responses of materials to high pressures unveil important insight into their structure–property relationships that are otherwise masked under ambient conditions. Here, using atomistic simulations, it is shown that the thermal conductivity of methylammonium lead iodide can be drastically increased by more than an order of magnitude with applications of ∼60 GPa hydrostatic pressures. The insights gained from the molecular dynamics simulations suggest that although the inorganic constituents contribute significantly to heat flow at ambient pressure, the organic constituents are largely responsible for the drastic increase in thermal conductivity at higher pressures. The application of hydrostatic pressure leads to severe octahedral distortions resulting in higher degrees of confinement of the organic molecules and the concomitant hardening of their vibrational density of states to high frequencies encompassing a very broad spectral range that are otherwise unavailable at ambient pressure. This is shown to drastically improve the overall thermal conductivity even though the contributions from the inorganic constituents remain largely unchanged throughout the pressure range studied in this work.

Graphical abstract: Origins of pressure-induced enhancement in thermal conductivity of hybrid inorganic–organic perovskites

Supplementary files

Article information


Submitted
11 Dec 2020
Accepted
28 Dec 2020
First published
29 Dec 2020

Nanoscale, 2021,13, 685-691
Article type
Communication

Origins of pressure-induced enhancement in thermal conductivity of hybrid inorganic–organic perovskites

A. Giri, Nanoscale, 2021, 13, 685 DOI: 10.1039/D0NR08776A

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