Printed electronics enable the fabrication of large-scale, low-cost electronic devices and systems and thus offer significant possibilities in terms of developing new optoelectronic application in various fields. Organic photodetectors (OPDs) represent an emerging organic optoelectronic device, which have attracted extensive attention due to many advantages such as low cost, mechanical flexibility and chemical tailoring. Herein, flexible bulk heterojunction (BHJ) OPDs are fabricated on polyethylene terephthalate (PET) substrate by large-scale roll-to-roll (R2R) micro-gravure printing technique using the novel printable ink, which consists of a conjugated polymer named PBDB-T and a nonfullerene small molecule named IT-M. The device photoresponse covers the range from ultraviolet (UV) to visible light (Vis). Meanwhile, OPDs show a high photoresponsivity (R) up to 4.18 A/W and a good detectivity (D*) as high as 1.11 × 1011 Jones. Under the different bending curvature or after being bent 5000 times, the flexible OPDs still well maintain the performance parameters. Furthermore, the large-area OPD arrays exhibit good uniformity and high stability in atmospheric conditions without any encapsulation for 40 days. This work reports the high-quality PBDB-T/IT-M BHJ used for UV–Vis photodetectors, which provides an innovation pathway to develop high-performance, flexible OPDs processed via large-scale, low-cost R2R printing technique.
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This work was supported by the National Key Research and Development Program of China (2017YFA0206600) and the National Natural Science Foundation of China (51673214). T.S.C acknowledges the support by Postdoctoral Programme in State Key Laboratory of Powder Metallurgy at the Central South University.
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The authors Liqing Yang and Sichao Tong contributed equally to this work.
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Yang, L., Tong, S., Gong, C. et al. Large-scale Roll-to-Roll Micro-gravure Printed Flexible PBDB-T/IT-M Bulk Heterojunction Photodetectors. Appl. Phys. A 126, 442 (2020). https://doi.org/10.1007/s00339-020-03624-0
- Organic photodetector
- Bulk heterojunction