Revealing the Impact of Phase Transition on <i>n</i> = 1 2D Perovskite Photodetectors With Intrinsically Tunable Narrowband Detection

Jones at an applied bias of 20 V. We reveal the existence of two different phases and the gradual transition based on halide compositions, studied how mixing halide drives phase segregation with density functional theory calculations. Although the chloride additive PEACl suppressed phase segregation in mixed halides, it introduced additional traps that reduced photocurrent. The additive enhanced the out-of-plane orientation, disrupting in-plane transport in photoconductors, but significantly improved performance in photodiodes. This work provides the first device-level insight into halide immiscibility in n = 1 2D-perovskites, revealing that overcoming the performance limitations in these systems requires balancing long-range structural order with short-range electronic disorder.

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Publication Details

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Small
Published
2026-04-03
DOI
https://doi.org/10.1002/smll.73312
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Revealing the Impact of Phase Transition on n = 1 2D Perovskite Photodetectors With Intrinsically Tunable Narrowband Detection

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Perovskite Materials and Applications
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Revealing the Impact of Phase Transition on n = 1 2D Perovskite Photodetectors With Intrinsically Tunable Narrowband Detection

Davide Nodari, Filip Aniés, Martyn A. McLachlan, Edoardo Angela, Flurin D. Eisner, Viktor Ellingsson, Artem A. Bakulin, Martina Rimmele, Nicola Gasparini, Longren Li, Francesco Furlan, H. W. Kim, Ding Ding, E. F. Clark, Alex M. Ganose, Zhang Qu, Zonglong Zhu, Alex Heeney, Stanley A. Cazaly, Francesco Vanin, Oscar Purcell‐Shirley, Martin Heeney, Shuang Xiao
article en

Abstract

Jones at an applied bias of 20 V. We reveal the existence of two different phases and the gradual transition based on halide compositions, studied how mixing halide drives phase segregation with density functional theory calculations. Although the chloride additive PEACl suppressed phase segregation in mixed halides, it introduced additional traps that reduced photocurrent. The additive enhanced the out-of-plane orientation, disrupting in-plane transport in photoconductors, but significantly improved performance in photodiodes. This work provides the first device-level insight into halide immiscibility in n = 1 2D-perovskites, revealing that overcoming the performance limitations in these systems requires balancing long-range structural order with short-range electronic disorder.

Small
Queen Mary University of London (GB), City University of Hong Kong (HK), Shenzhen Technology University (CN), Imperial College London (GB), King Abdullah University of Science and Technology (SA)
Shenzhen Science and Technology Innovation Program
Openalex Percentile: Top 27%
Perovskite Materials and Applications
DOIOpen Access PDFOpenAlex
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