Enhanced Carrier Mobility and Diffusion Length in Formamidinium-Rich Hybrid Perovskites: Effects of Grain-Size and Electron–Phonon Coupling

The Journal of Physical Chemistry Letters 2026

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Authors: Mitko Oldfield, Gary Beane, ‪Sebastian O. Fürer, Tan-Phat Nguyen, Philippe J. Holzhey, Boer Tan, Wenxin Mao, Henry Snaith, Udo Bach, Agustin Schiffrin
DOI: 10.1021/acs.jpclett.6c00264
Cited by: 1
References: 99

Abstract

. These differences in mobility and diffusion length persist across different fluences, and are captured by a fluence-dependent rate model that accounts for both carrier generation and recombination at different material depths. From scanning electron microscopy and THz time-domain spectroscopy measurements, we attribute the increased mobility and diffusion length for the FA-rich perovskite mainly to a larger average grain size, after considering possible Fröhlich-type interactions between carriers and THz-active phonon modes. Our work establishes a mechanistic link between material microstructure and ultrafast carrier dynamics, informing crucial design principles for perovskite-based photovoltaic and optoelectronic applications.

Fields of Study & Subjects

Perovskite Materials and Applications Chemical and Physical Properties of Materials Advanced Thermoelectric Materials and Devices

Publication details

Journal / source
The Journal of Physical Chemistry Letters
Publisher
American Chemical Society (ACS)
Volume
17
Issue
18
Pages
5197–5206
Publication date
28 April 2026
Language
EN