# Slow cooling of hot polarons in halide perovskite solar cells

Source: [Slow cooling of hot polarons in halide perovskite solar cells](<https://www.sota2.com/research/paper/68fa36e31e209131ce8ad959>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T22:04:21.177Z

Authors: Jarvist Moore Frost, Lucy D. Whalley, Aron Walsh

Published: 2017-08-14T14:53:33.000Z

## Abstract

Halide perovskites show unusual thermalisation kinetics for above bandgap photo-excitation. We explain this as a consequence of excess energy being deposited into discrete large polaron states. The cross-over between low-fluence and high-fluence \`phonon bottleneck' cooling is due to a Mott transition where the polarons overlap ($n \\ge 10^{18}/\\mathrm{cm}^3$) and the phonon sub-populations are shared. We calculate the initial rate of cooling (thermalisation) from the scattering time in the Fr\\"ohlich polaron model to be 78 meVps$^{-1}$ for $\\mathrm{CH}\_3\\mathrm{NH}\_3\\mathrm{PbI}\_3$. This rapid initial thermalisation involves heat transfer into optical phonon modes coupled by a polar dielectric interaction. Further cooling to equilibrium over hundreds of picoseconds is limited by the ultra-low thermal conductivity of the perovskite lattice.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1708.04158>)

[PDF](<https://arxiv.org/pdf/1708.04158.pdf>)