Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

Jonas Kublitski (), Axel Fischer, Shen Xing, Lukasz Baisinger, Eva Bittrich, Donato Spoltore, Johannes Benduhn, Koen Vandewal and Karl Leo ()
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Jonas Kublitski: Technische Universität Dresden
Axel Fischer: Technische Universität Dresden
Shen Xing: Technische Universität Dresden
Lukasz Baisinger: Technische Universität Dresden
Eva Bittrich: Leibniz-Institut für Polymerforschung Dresden e.V.
Donato Spoltore: Technische Universität Dresden
Johannes Benduhn: Technische Universität Dresden
Koen Vandewal: Hasselt University
Karl Leo: Technische Universität Dresden

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

Abstract: Abstract Detection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

Date: 2021
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DOI: 10.1038/s41467-021-24500-2

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