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Thermally-enhanced photo-electric response of an organic semiconductor with low exciton binding energy for simultaneous and distinguishable detection of light and temperature

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Abstract

Simultaneous and distinguishable detection of external stimuli such as light and temperature is of great interest for a variety of scientific and industrial applications. Theoretically, an organic semiconductor with low exciton binding energy, low thermal activation energy and good charge transporting property produces thermally enhanced photo-electric response in organic phototransistors (OPTs), which thus provides an ideal and effective way to realize the simultaneous and distinguishable detection of temperature and light. However, there is no report on such a kind of organic semiconductor until now. Herein, we designed and synthesized a narrow band gap organic small molecule semiconductor 2,5-bis(2-butyloctyl)-3,6-bis(5-(4-(diphenylamino)phenyl) thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP-T-TPA) with low exciton binding energy (about 37 meV) and small activation energy (about 61 meV) for distinct thermal-dependence of charge carrier and exciton. The low exciton binding energy enables the semiconductor to exhibit strong thermal dependence of exciton dissociation, which contributes to the thermally-enhanced photo-electric response. Furthermore, the low thermal activation energy produces the weak thermal dependence of charge transport, which avoids the disturbance of thermally-modulated charge transport on photo-electric response. Benefiting from these two features, phototransistors based on DPP-T-TPA show great potential in simultaneous and distinguishable detection of light and temperature, which represents a novel and efficient way for bifunctional detection.

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Acknowledgements

This work was supported by the National Key Research and Development Program (2018YFA0703200, 2016YFB0401100, 2016YFA0200803), National Natural Science Foundation of China (52073210, 21905199, 21573277, 51633006) and Tianjin Natural Science Foundation (19JCZDJC37400, 194214030036, 20JCQNJC01520).

Author information

Authors and Affiliations

  1. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China

    Yongxu Hu, Li Yu, Yinan Huang, Zhongwu Wang, Shuguang Wang, Xiaosong Chen, Deyang Ji, Jie Li, Yajing Sun, Liqiang Li & Wenping Hu

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

    Liqiang Li & Wenping Hu

  3. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Huanli Dong

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  1. Yongxu Hu
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  2. Li Yu
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  3. Yinan Huang
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  4. Zhongwu Wang
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  5. Shuguang Wang
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  9. Jie Li
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  10. Yajing Sun
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Correspondence to Jie Li, Yajing Sun or Liqiang Li.

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Supporting information The supporting information is available online at http://chem.scichina.com and http://link.springer.com/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_2021_1118_MOESM1_ESM.docx

Thermally-Enhanced Photo-Electric Response of an Organic Semiconductor with Low Exciton Binding Energy for Simultaneous and DistinguishableDetection of Light and Temperature

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Hu, Y., Yu, L., Huang, Y. et al. Thermally-enhanced photo-electric response of an organic semiconductor with low exciton binding energy for simultaneous and distinguishable detection of light and temperature. Sci. China Chem. 65, 145–152 (2022). https://doi.org/10.1007/s11426-021-1118-9

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  • DOI: https://doi.org/10.1007/s11426-021-1118-9

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