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Reverse dark current in organic photodetectors and the major role of traps as source of noise

Jonas Kublitski1*, Andreas Hofacker1*, Bahman K. Boroujeni2,3, Johannes Benduhn1, Vasileios C. Nikolis1,4, Christina Kaiser5, Donato Spoltore1, Hans Kleemann1, Axel Fischer1, Frank Ellinger3, Koen Vandewal6*, Karl Leo1,3

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 Chair of Circuit Design and Network Theory (CCN), Technische Universität Dresden, 01069 Dresden, Germany

3 Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden, Germany

4 Heliatek GmbH, Treidlerstrasse 3, 01139 Dresden, Germany

5 Swansea University, Singleton Park SA2 8PP, Wales, UK

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

* Corresponding authors emails: jonas.kublitski@tu-dresden.de, andreas.hofacker@tu-dresden.de, koen.vandewal@uhasselt.be
DOI10.24435/materialscloud:sq-wv [version v1]

Publication date: Nov 26, 2020

How to cite this record

Jonas Kublitski, Andreas Hofacker, Bahman K. Boroujeni, Johannes Benduhn, Vasileios C. Nikolis, Christina Kaiser, Donato Spoltore, Hans Kleemann, Axel Fischer, Frank Ellinger, Koen Vandewal, Karl Leo, Reverse dark current in organic photodetectors and the major role of traps as source of noise, Materials Cloud Archive 2020.152 (2020), doi: 10.24435/materialscloud:sq-wv.

Description

Organic photodetectors have promising applications in low-cost imaging, health monitoring and near infrared sensing. Recent research on organic photodetectors based on donor-acceptor systems has resulted in narrow-band, flexible and biocompatible devices, of which the best reach external photovoltaic quantum efficiencies approaching 100%. However, the high noise spectral density of these devices limits their specific detectivity to around 10^13 Jones in the visible and several orders of magnitude lower in the near-infrared, severely reducing performance. Here, we show that the shot noise, proportional to the dark current, dominates the noise spectral density, demanding a comprehensive understanding of the dark current. We demonstrate that, in addition to the intrinsic saturation current generated via charge-transfer states, dark current contains a major contribution from trap-assisted generated charges and decreases systematically with decreasing concentration of traps. By modeling the dark current of several donor-acceptor systems, we reveal the interplay between traps and charge-transfer states as source of dark current and show that traps dominate the generation processes, thus being the main limiting factor of organic photodetectors detectivity.

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Keywords

Organic Photodetectors Dark current Traps Detectivity

Version history:

2020.152 (version v1) [This version] Nov 26, 2020 DOI10.24435/materialscloud:sq-wv