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

Jonas Kublitski1*, Axel Fischer1, Shen Xing1, Lukasz Baisinger1, Eva Bittrich2, Johannes Benduhn1, Donato Spoltore1, Koen Vandewal3, Karl Leo1

1 Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany

2 Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany

3 Instituut voor Materiaalonderzoek (IMO), Hasselt University, Wetenschapspark 1, BE-3590, Diepenbeek, Belgium

* Corresponding authors emails: jonas.kublitski@tu-dresden.de
DOI10.24435/materialscloud:8w-q6 [version v1]

Publication date: Jun 21, 2021

How to cite this record

Jonas Kublitski, Axel Fischer, Shen Xing, Lukasz Baisinger, Eva Bittrich, Johannes Benduhn, Donato Spoltore, Koen Vandewal, Karl Leo, Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors, Materials Cloud Archive 2021.89 (2021), doi: 10.24435/materialscloud:8w-q6.

Description

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

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Keywords

Photomultiplication Organic Photodetectors Narrowband Experimental

Version history:

2021.89 (version v1) [This version] Jun 21, 2021 DOI10.24435/materialscloud:8w-q6