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Research Article

Few-layered organic single-crystalline heterojunctions for high-performance phototransistors

Xinzi Tian1, Jiarong Yao1, Lijuan Zhang1, Bin Han1, Jianwei Shi3, Jianwei Su4, Jie Liu5, Chunlei Li5, Xinfeng Liu3( ), Tianyou Zhai4, Lang Jiang5, Fangxu Yang1, Xiaotao Zhang1, Ye Zou5, Rongjin Li1( ), Wenping Hu1,2,5
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Graphical Abstract

Abstract

Photogating and electrical gating are key physical mechanisms in organic phototransistors (OPTs). However, most OPTs are based on thick and polycrystalline films, which leads to substantially low efficiency of both photogating and electrical gating and thus reduced photoresponse. Herein, high-performance OPTs based on few-layered organic single-crystalline heterojunctions are proposed and the obstacle of thick and polycrystalline films for photodetection is overcome. Because of the molecular scale thickness of the type I organic single-crystalline heterojunctions in OPTs, both photogating and electrical gating are highly efficient. By synergy of efficient photogating and electrical gating, key figures of merit of OPTs reach the highest among those based on planar heterojunctions so far as we know. The production of few-layered organic single-crystalline heterojunctions will provide a new type of advanced materials for various applications.

Keywords

two-dimensional (2D) molecular crystalsorganic single crystalsorganic heterojunctionsorganic phototransistors

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Nano Research
Volume 15 Issue 3,
March 2022
Pages 2667-2673
DOI: 10.1007/s12274-021-3730-3
Cite this article:
Tian X, Yao J, Zhang L, et al. Few-layered organic single-crystalline heterojunctions for high-performance phototransistors. Nano Research, 2022, 15(3): 2667-2673. https://doi.org/10.1007/s12274-021-3730-3
Topics:
Organic semiconductor materials

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Received: 22 April 2021
Revised: 28 June 2021
Accepted: 03 July 2021
Published: 05 August 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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