Metal‐Free Halide Perovskite Single Crystals with Very Long Charge Lifetimes for Efficient X‐ray Imaging

Xin Song; Qingyue Cui; Yucheng Liu; Zhuo Xu; Hagai Cohen; Chuang Ma; Yuanyuan Fan; Yunxia Zhang; Haochen Ye; Zhanhui Peng; Ruipeng Li; Yonghua Chen; Jianpu Wang; Huaming Sun; Zhou Yang; Zhike Liu; Zupei Yang; Wei Huang; Gary Hodes; Shengzhong (Frank) Liu; Kui Zhao

doi:10.1002/adma.202003353

journal article·2020-10

Metal‐Free Halide Perovskite Single Crystals with Very Long Charge Lifetimes for Efficient X‐ray Imaging

Xin Song, Qingyue Cui, Yucheng Liu, Zhuo Xu, Hagai Cohen, Chuang Ma, Yuanyuan Fan, Yunxia Zhang, Haochen Ye, Zhanhui Peng, Ruipeng Li, Yonghua Chen, Jianpu Wang, Huaming Sun, Zhou Yang, Zhike Liu, Zupei Yang, Wei Huang, Gary Hodes, Shengzhong (Frank) Liu, Kui Zhao

Advanced Materials· Volume 32· Issue 42

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Abstract

Abstract Metal‐free halide perovskites, as a specific category of the perovskite family, have recently emerged as novel semiconductors for organic ferroelectrics and promise the wide chemical diversity of the ABX₃ perovskite structure with mechanical flexibility, light weight, and eco‐friendly processing. However, after the initial discovery 17 years ago, there has been no experimental information about their charge transport properties and only one brief mention of their optoelectronic properties. Here, growth of large single crystals of metal‐free halide perovskite DABCO‐NH₄Br₃ (DABCO = N‐N′‐diazabicyclo[2.2.2]octonium) is reported together with characterization of their instrinsic optical and electronic properties and demonstration, of metal‐free halide perovskite optoelectronics. The results reveal that the crystals have an unusually large semigap of ≈16 eV and a specific band nature with the valence band maximum and the conduction band minimum mainly dominated by the halide and DABCO²⁺, respectively. The unusually large semigap rationalizes extremely long lifetimes approaching the millisecond regime, leading to very high charge diffusion lengths (tens of μm). The crystals also exhibit high X‐ray attenuation as well as being lightweight. All these properties translate to high‐performance X‐ray imaging with sensitivity up to 173 μC Gy_air⁻¹ cm⁻². This makes metal‐free perovskites novel candidates for the next generation of optoelectronics.

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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Luminescence Properties of Advanced Materials

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

Affiliations

Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China

Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) University of Science and Technology of China Hefei 230026 China

Department of Chemical Research Support Weizmann Institute of Science Rehovot 76100 Israel

NSLS II Brookhaven National Lab Upton NY 11973 USA

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing Jiangsu 211800 China

Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an Shaanxi 710072 China

Department of Materials and Interfaces Weizmann Institute of Science Rehovot 76100 Israel

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities

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