Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion

Chunhua Wang; Zhirun Xie; Pengshan Xie; Huiqiang Liang; Yang Ding; Yannan Wang; Michael K.H. Leung; Guosong Zeng; Johnny C. Ho; Sateesh Bandaru; Ning Han; Bao-Lian Su; Yun Hau Ng

doi:10.1002/aenm.202500921

Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion

Chunhua Wang, Zhirun Xie, Pengshan Xie, Huiqiang Liang, Yang Ding, Yannan Wang, Michael K.H. Leung, Guosong Zeng, Johnny C. Ho, Sateesh Bandaru^*, Ning Han^*, Bao-Lian Su^*, Yun Hau Ng^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

4 Citations (Scopus)

1 Downloads (CityUHK Scholars)

Abstract

Halide double perovskites have recently garnered significant interest in solar energy conversion applications owing to their non-toxic and high solar absorption properties. However, unanticipated structural distortion within these materials can compromise their performance, suppressing the structural distortion is essential and remains challenging. Here, it is reported that using phenylethylamine triggering the disorder-order phase transition can largely increase the ordering extent of octahedra in double perovskite Cs₂AgBiBr₆, which can suppress self-trapped exciton and defect and enable rapid charge separation, leading to exceptional photo-physics/chemistry properties with over sixfold photoactivity enhancement in the photocatalytic C−H bond activation compared to less ordered structures. This work provides an effective strategy to solve the challenging problem of the disorder phenomenon of halide double perovskites for boosting solar-to-chemical energy conversion. © 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

Original language	English
Article number	2500921
Journal	Advanced Energy Materials
DOIs	https://doi.org/10.1002/aenm.202500921
Publication status	Online published - 6 May 2025

Funding

This work was financially supported by the Hong Kong Research Grant Council (RGC) General Research Fund (GRF) (CityU 11305419, CityU 11306920, CityU 11308721, CityU 11316522), and SIRG 7020022.

Research Keywords

charge dynamics
halide double perovskite
phase transition
photocatalysis
photoelectric property

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This full text is made available under CC-BY-NC-ND 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/

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RGC-funded

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion",

abstract = "Halide double perovskites have recently garnered significant interest in solar energy conversion applications owing to their non-toxic and high solar absorption properties. However, unanticipated structural distortion within these materials can compromise their performance, suppressing the structural distortion is essential and remains challenging. Here, it is reported that using phenylethylamine triggering the disorder-order phase transition can largely increase the ordering extent of octahedra in double perovskite Cs2AgBiBr6, which can suppress self-trapped exciton and defect and enable rapid charge separation, leading to exceptional photo-physics/chemistry properties with over sixfold photoactivity enhancement in the photocatalytic C−H bond activation compared to less ordered structures. This work provides an effective strategy to solve the challenging problem of the disorder phenomenon of halide double perovskites for boosting solar-to-chemical energy conversion. {\textcopyright} 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.",

keywords = "charge dynamics, halide double perovskite, phase transition, photocatalysis, photoelectric property",

author = "Chunhua Wang and Zhirun Xie and Pengshan Xie and Huiqiang Liang and Yang Ding and Yannan Wang and Leung, {Michael K.H.} and Guosong Zeng and Ho, {Johnny C.} and Sateesh Bandaru and Ning Han and Bao-Lian Su and Ng, {Yun Hau}",

year = "2025",

month = may,

day = "6",

doi = "10.1002/aenm.202500921",

language = "English",

journal = "Advanced Energy Materials",

issn = "1614-6832",

publisher = "John Wiley & Sons",

}

TY - JOUR

T1 - Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion

AU - Wang, Chunhua

AU - Xie, Zhirun

AU - Xie, Pengshan

AU - Liang, Huiqiang

AU - Ding, Yang

AU - Wang, Yannan

AU - Leung, Michael K.H.

AU - Zeng, Guosong

AU - Ho, Johnny C.

AU - Bandaru, Sateesh

AU - Han, Ning

AU - Su, Bao-Lian

AU - Ng, Yun Hau

PY - 2025/5/6

Y1 - 2025/5/6

N2 - Halide double perovskites have recently garnered significant interest in solar energy conversion applications owing to their non-toxic and high solar absorption properties. However, unanticipated structural distortion within these materials can compromise their performance, suppressing the structural distortion is essential and remains challenging. Here, it is reported that using phenylethylamine triggering the disorder-order phase transition can largely increase the ordering extent of octahedra in double perovskite Cs2AgBiBr6, which can suppress self-trapped exciton and defect and enable rapid charge separation, leading to exceptional photo-physics/chemistry properties with over sixfold photoactivity enhancement in the photocatalytic C−H bond activation compared to less ordered structures. This work provides an effective strategy to solve the challenging problem of the disorder phenomenon of halide double perovskites for boosting solar-to-chemical energy conversion. © 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

AB - Halide double perovskites have recently garnered significant interest in solar energy conversion applications owing to their non-toxic and high solar absorption properties. However, unanticipated structural distortion within these materials can compromise their performance, suppressing the structural distortion is essential and remains challenging. Here, it is reported that using phenylethylamine triggering the disorder-order phase transition can largely increase the ordering extent of octahedra in double perovskite Cs2AgBiBr6, which can suppress self-trapped exciton and defect and enable rapid charge separation, leading to exceptional photo-physics/chemistry properties with over sixfold photoactivity enhancement in the photocatalytic C−H bond activation compared to less ordered structures. This work provides an effective strategy to solve the challenging problem of the disorder phenomenon of halide double perovskites for boosting solar-to-chemical energy conversion. © 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

KW - charge dynamics

KW - halide double perovskite

KW - phase transition

KW - photocatalysis

KW - photoelectric property

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U2 - 10.1002/aenm.202500921

DO - 10.1002/aenm.202500921

M3 - RGC 21 - Publication in refereed journal

SN - 1614-6832

JO - Advanced Energy Materials

JF - Advanced Energy Materials

M1 - 2500921

ER -

Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion

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Funding

Research Keywords

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UN SDGs

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GRF: Tuning the Selectivity Towards Solar Fuels via Manipulation of Photocharge Transfer of Oxide Photocatalysts

GRF: Understanding the Improved Photocharge Transportation in Bismuth-Based Photocatalysts via Defect and Structural Engineering

GRF: Development of Nanostructured Photoelectrodes for Solar Water Splitting via Advanced Electrochemical-based Synthesis Techniques

Cite this

Phase Transition in Halide Double Perovskites for Solar-To-Chemical Energy Conversion

Abstract

Funding

Research Keywords

Publisher's Copyright Statement

RGC Funding Information

UN SDGs

Access Output

Other Access Options

Permanent Link

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Projects

GRF: Tuning the Selectivity Towards Solar Fuels via Manipulation of Photocharge Transfer of Oxide Photocatalysts

GRF: Understanding the Improved Photocharge Transportation in Bismuth-Based Photocatalysts via Defect and Structural Engineering

GRF: Development of Nanostructured Photoelectrodes for Solar Water Splitting via Advanced Electrochemical-based Synthesis Techniques

Cite this