Large-scale Roll-to-Roll Micro-gravure Printed Flexible PBDB-T/IT-M Bulk Heterojunction Photodetectors
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Large‑scale Roll‑to‑Roll Micro‑gravure Printed Flexible PBDB‑T/IT‑M Bulk Heterojunction Photodetectors Liqing Yang1 · Sichao Tong1 · Chendi Gong2 · Huayan Xia2 · Chunhua Wang2 · Biao Liu2 · Baoxing Liu2 · Haipeng Xie2 · Si Xiao2 · Jun He2 · Dou Zhang1 · Guozhang Dai2 · Junliang Yang1,2 Received: 4 March 2020 / Accepted: 11 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Organic photodetector · Flexible · Bulk heterojunction · Printing
The authors Liqing Yang and Sichao Tong contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03624-0) contains supplementary material, which is available to authorized users. * Dou Zhang [email protected] * Guozhang Dai [email protected] * Junliang Yang [email protected] Liqing Yang [email protected] Jun He [email protected] 1
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, China
Hunan Key Laboratory for Super‑Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China
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1 Introduction Organic photodetectors (OPDs) are a kind of devices that capture optical signals and convert them into electrical signals. Organic materials have many unique advantages, such as solution processability, rich material options and chemically tailored properties, as well as lightweight and flexibility, [1–4] so they have great application prospects in wearable devices, paper replacements, aerospace science and storage devices
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