Supramolecular engineering of charge transfer in wide bandgap organic semiconductors with enhanced visible-to-NIR photoresponse

Yifan Yao, Qi Ou, Kuidong Wang, Haijun Peng, Feier Fang, Yumeng Shi, Ye Wang, Daniel Iglesias Asperilla, Zhigang Shuai and Paolo Samorì ()
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Yifan Yao: University of Strasbourg, CNRS, ISIS UMR 7006
Qi Ou: Tsinghua University
Kuidong Wang: University of Strasbourg, CNRS, ISIS UMR 7006
Haijun Peng: University of Strasbourg, CNRS, ISIS UMR 7006
Feier Fang: Shenzhen University
Yumeng Shi: Shenzhen University
Ye Wang: University of Strasbourg, CNRS, ISIS UMR 7006
Daniel Iglesias Asperilla: University of Strasbourg, CNRS, ISIS UMR 7006
Zhigang Shuai: Tsinghua University
Paolo Samorì: University of Strasbourg, CNRS, ISIS UMR 7006

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Organic photodetectors displaying efficient photoelectric response in the near-infrared are typically based on narrow bandgap active materials. Unfortunately, the latter require complex molecular design to ensure sufficient light absorption in the near-infrared region. Here, we show a method combining an unconventional device architecture and ad-hoc supramolecular self-assembly to trigger the emergence of opto-electronic properties yielding to remarkably high near-infrared response using a wide bandgap material as active component. Our optimized vertical phototransistors comprising a network of supramolecular nanowires of N,N′-dioctyl-3,4,9,10-perylenedicarboximide sandwiched between a monolayer graphene bottom-contact and Au nanomesh scaffold top-electrode exhibit ultrasensitive light response to monochromatic light from visible to near-infrared range, with photoresponsivity of 2 × 105 A/W and 1 × 102 A/W, at 570 nm and 940 nm, respectively, hence outperforming devices based on narrow bandgap materials. Moreover, these devices also operate as highly sensitive photoplethysmography tool for health monitoring.

Date: 2021
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DOI: 10.1038/s41467-021-23914-2

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