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arXiv · 2312.14914

First-principle quantum Monte-Carlo study of charge carrier mobility in organic molecular semiconductors

Johann Ostmeyer·Tahereh Nematiaram·Alessandro Troisi·Pavel Buividovich
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Abstract

We present a first-principle numerical study of charge transport in a realistic two-dimensional tight-binding model of organic molecular semiconductors. We use the Hybrid Monte Carlo (HMC) algorithm to simulate the full quantum dynamics of phonons and either a single or multiple charge carriers without any tunable parameters. We introduce a number of algorithmic improvements, including efficient Metropolis updates for phonon fields based on analytic insights, which lead to negligible autocorrelation times and allow to reach sub-permille precisions at small computational cost of $O(1)$ CPU-hour. Our simulations produce charge mobility estimates that are in good agreement with experiment and that also justify the phenomenological Transient Localisation approach.

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Johann Ostmeyer, Tahereh Nematiaram, Alessandro Troisi, Pavel Buividovich. 2023-12-22. First-principle quantum Monte-Carlo study of charge carrier mobility in organic molecular semiconductors. https://doi.org/10.1103/physrevapplied.22.l031004

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