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Issue 7, 2016
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Double-side responsive polymer near-infrared photodetectors with transfer-printed electrode

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Abstract

Low dark current is critical to realize high-performance near-infrared organic photodetectors (NIR-OPDs). In general, organic photodetectors (OPDs) are with vacuum-deposited metals as the top electrode. The deposition of such metal would inevitably form doping to the organic active layer and thus yield high dark current. Herein, we employ transfer-printed conducting polymer (tp-CP) as the top electrode instead of the vacuum-deposited metal electrode. The photodetector with tp-CP electrode exhibits over two orders of magnitude lower dark current density than the device with the vacuum-deposited metal electrode. The photodetector with tp-CP electrode displays a responsivity of 0.37 A W−1 at 850 nm and a low dark current density of 3.0 nA cm−2 at −0.2 V based on a near-infrared (NIR) active layer of PMDPP3T:PC61BM that absorbs photons up to 1000 nm. The detectivity of the NIR photodetector reaches as high as over 1013 Jones. Furthermore, the NIR photodetector is double-side responsive to incident light, either from the bottom or the top electrode, because the top tp-CP electrode shows similar transparency as the bottom indium-tin oxide electrode.

Graphical abstract: Double-side responsive polymer near-infrared photodetectors with transfer-printed electrode

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Publication details

The article was received on 04 Dec 2015, accepted on 08 Jan 2016 and first published on 08 Jan 2016


Article type: Paper
DOI: 10.1039/C5TC04111B
Citation: J. Mater. Chem. C, 2016,4, 1414-1419
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    Double-side responsive polymer near-infrared photodetectors with transfer-printed electrode

    S. Xiong, J. Tong, L. Mao, Z. Li, F. Qin, F. Jiang, W. Meng, T. Liu, W. Li and Y. Zhou, J. Mater. Chem. C, 2016, 4, 1414
    DOI: 10.1039/C5TC04111B

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