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Cocrystal engineering: towards high-performance near-infrared organic phototransistors based on donor-acceptor charge transfer cocrystals

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Abstract

Near-infrared organic phototransistors have wide application prospects in many fields. The active materials with the high mobility and near-infrared response are critical to building high-performance near-infrared organic phototransistors, which are scarce at present. Herein, a new charge transfer cocrystal using 5,7-dihydroindolo[2,3-b]carbazole (5,7-ICZ) as the donor and 2,2′-(benzo[1,2-b:4,5-b′]dithiophene-4,8-diylidene)dimalononitrile (DTTCNQ) as the acceptor is properly designed and prepared in a stoichiometric ratio (D:A=1:1), which not only displays a high electron mobility of 0.15 cm2 V−1 s−1 and very low dark current, but also can serve as the active layer materials in the region of near-infrared detection due to the narrowed band gap and good charge transport properties. A high photosensitivity of 1.8×104, the ultrahigh photoresponsivity of 2,923 A W−1 and the high detectivity of 4.26×1011 Jones of the organic near-infrared phototransistors are obtained.

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Acknowledgements

This work was supported by the Ministry of Science and Technology of China (2018YFA0703200 and 2017YFA0204503), the National Natural Science Foundation of China (52121002, 51733004, U21A6002, 51725304 and 21875158), Tian** Natural Science Foundation (20JCJQJC00300) and China Postdoctoral Science Foundation (2021M692381).

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Authors and Affiliations

  1. Tian** Key Laboratory of Molecular Optoelectronic Sciences, Institute of Molecular Aggregation Science of Tian** University, Tian**, 300072, China

    Fei Li, Shuyu Li & ** Hu

  2. Joint School of National University of Singapore and Tian** University, International Campus of Tian** University, Fuzhou, 350207, China

    Lingjie Sun & Wen** Hu

  3. Key Laboratory of Resource Chemistry and Eco-environmental Protection in Qinghai-Tibet Plateau, Qinghai Minzu University, **ning, 810007, China

    Weibing Dong

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  1. Fei Li
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  8. **aotao Zhang
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Correspondence to Lingjie Sun or **aotao Zhang.

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The supporting information is available online at chem.scichina.com and springer.longhoe.net/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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11426_2022_1450_MOESM1_ESM.pdf

Cocrystal engineering: towards high-performance near-infrared organic phototransistors based on donor-acceptor charge transfer cocrystals

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Li, F., Zheng, L., Sun, Y. et al. Cocrystal engineering: towards high-performance near-infrared organic phototransistors based on donor-acceptor charge transfer cocrystals. Sci. China Chem. 66, 266–272 (2023). https://doi.org/10.1007/s11426-022-1450-0

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