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Polymer: Non-fullerene acceptor heterojunction-based phototransistor for short-wave infrared photodetection

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Abstract

It remains full of challenge for extending short-wave infrared (SWIR) spectral response and weak-light detection in the context of broad spectral responses for phototransistor. In this work, a novel poly(2,5-bis(4-hexyldodecyl)-2,5-dihydro-3,6-di-2-thienylpyrrolo[3,4-c]pyrrole-1,4-dione-alt-thiophene) (PDPPT3-HDO):COTIC-4F organic bulk-heterojunction is prepared as active layer for bulk heterojunction phototransistors. PDPPT3-HDO serves as a hole transport material, while COTIC-4F enhances the absorption of SWIR light to 1020 nm. As a result, smooth and connected PDPPT3-HDO film is fabricated by blade coating method and exhibits high hole mobility up to 2.34 cm2·V−1·s−1 with a current on/off ratio of 4.72 × 105 in organic thin film transistors. PDPPT3-HDO:COTIC-4F heterojunction phototransistors exhibit high responsivity of 2680 A·W−1 to 900 nm and 815 A·W−1 to 1020 nm, with fast response time (rise time ~ 20 ms and fall time ~ 100 ms). The photosensitivity of the heterojunction phototransistor improves as the mass ratio of non-fullerene acceptors increases, resulting in an approximately two orders of magnitude enhancement compared to the bare polymer phototransistor. Importantly, the phototransistor exhibits decent responsivity even under ultra-weak light power of 43 μ·cm−2 to 1020 nm. This work represents a highly effective and general strategy for fabricating efficient and sensitive SWIR light photodetectors.

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Acknowledgements

This work was financially supported by the Ministry of Science and Technology of China (Nos. 2017YFA0204503 and 2018YFA0703200), the National Natural Science Foundation of China (Nos. 52121002, 51733004, 51725304, 21875158, and U21A6002), Tianjin Natural Science Foundation (No. 20JCJQJC00300) and the Discretionary Fund of Tianjin University (No. 2104).

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  1. Key Laboratory of Organic Integrated Circuits of Ministry of Education & Key Laboratory of Molecular Optoelectronic Sciences, School of Science & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072, China

    Jing Li, Weigang Zhu & Wenping Hu

  2. Key Laboratory of Organic Integrated Circuits of Ministry of Education & Key Laboratory of Molecular Optoelectronic Sciences, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Yang Han & Yanhou Geng

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  1. Jing Li
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Correspondence to Weigang Zhu or Wenping Hu.

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Li, J., Zhu, W., Han, Y. et al. Polymer: Non-fullerene acceptor heterojunction-based phototransistor for short-wave infrared photodetection. Nano Res. 17, 3087–3095 (2024). https://doi.org/10.1007/s12274-023-6175-z

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