Identifying and Overcoming the Polaron-Induced Mobility Limit in a 2D Germanium Halide Perovskite

ACS Nano 2026

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Authors: Ying Liu, Yawei Lv, Pingan Chen, Zhiqiang Ming, Xincan Qiu, Jiangnan Xia, Long Cheng, Fuxiang Li, Huanxin Ju, Xiao Wang, Abd. Rashid bin Mohd Yusoff, Lang Jiang
+3 more Lei Liao, Henning Sirringhaus, Yuanyuan Hu
DOI: 10.1021/acsnano.5c18264
Cited by: 2
References: 41

Abstract

). We provide direct spectroscopic evidence that this behavior is driven by exceptionally strong electron-phonon coupling in the GHP lattice. Critically, we validate this by demonstrating that rational cation engineering to suppress this coupling switches the transport mechanism back to the more efficient band-like regime, enhancing mobility by over an order of magnitude. This work not only identifies small polaron formation as the primary performance limit in GHPs but also demonstrates a clear strategy to overcome it, contributing to the rational design of high-performance, nontoxic perovskite optoelectronics.

Fields of Study & Subjects

Perovskite Materials and Applications 2D Materials and Applications Strong Light-Matter Interactions

Publication details

Journal / source
ACS Nano
Publisher
American Chemical Society (ACS)
Volume
20
Issue
7
Pages
5839–5849
Publication date
7 February 2026
Language
EN