DataVXAdvanced Optical MaterialsPaper
journal article·2026-03

Insights Into Ferroelectric Phase Transition Mechanism for One‐Dimensional Halide Perovskites to Attain Record‐Performance Self‐Powered X‐Ray Detection

Hanqing Zeng, Beiquan Jia, Xiaolong Feng, Jiaxue You, Yiru Gu, Shilong Jia, Pengda Tong, Shisong Zhang, Jun Xi, Ningyi Yuan, Jianning Ding, Alex K. Y. Jen, Lu Zhang, Shengzhong(Frank) Liu

Advanced Optical Materials· Volume 14· Issue 12
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Source abstract

Abstract

ABSTRACT The spontaneous polarization in ferroelectric perovskites offers a promising route toward self‐powered X‐ray detection, yet the microscopic link between ferroelectric phase transition and detector‐relevant carrier dynamics remains largely unexplored. Here, using 1D [3‐(aminomethyl)piperidinium]BiI 5 single crystals (3AMP SCs) as a model system, we uncover how a specific first‐order ferroelectric–paraelectric transition mechanism directly governs polarization‐driven carrier transport and photovoltaic behavior. Structural analyses reveal that room‐temperature ferroelectricity originates from the non‐centrosymmetric ordering of 3AMP 2 + cations and strong organic–inorganic interfacial coupling, while the transition at 364 K is driven by highly anharmonic hydrogen‐bond dynamics and stabilized by the rigidity of the Bi–I framework. This cooperative mechanism generates a robust polarization field along the c‐axis, which reduces exciton binding energy, suppresses trap‐assisted recombination, and enables efficient carrier separation through the bulk and anomalous photovoltaic effects. As a direct consequence of this phase‐transition‐controlled transport behavior, the 3AMP SC‐based detector achieves record‐performance self‐powered X‐ray detection, with a sensitivity of 566.79 µC Gy air −1 cm −2 , an ultra‐low detection limit of 5.24 nGy air s −1 , and excellent long‐term stability. This work establishes a clear structure–phase transition–polarization–transport–performance relationship in Bi‐based halide perovskites, providing a new framework for designing ferroelectric materials for self‐powered optoelectronic devices.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Electronic and Structural Properties of Oxides · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an P. R. China

Key Laboratory for Macromolecular Science of Shaanxi Province and Shaanxi Key Laboratory for Advanced Energy Devices School of Materials and Engineering Shaanxi Normal University Xi'an P. R. China

Department of Materials Science and Engineering Hong Kong Institute for Clean Energy City University of Hong Kong Hong Kong P. R. China

School of Electronic Science and Engineering Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique Xi'an Jiaotong University Xi'an P. R. China

Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou P. R. China

School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou P. R. China

Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian P. R. China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing P. R. China

CNNP Optoelectronics Technology Shanghai P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities · Higher Education Discipline Innovation Project

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