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Title: | Reverse dark current in organic photodetectors and the major role of traps as source of noise | Authors: | Kublitski, Jonas Hofacker, Andreas Boroujeni, Bahman K. Benduhn, Johannes Nikolis, Vasileios C. Kaiser, Christina SPOLTORE, Donato Kleemann, Hans Fischer, Axel Ellinger, Frank VANDEWAL, Koen Leo, Karl |
Issue Date: | 2021 | Publisher: | NATURE RESEARCH | Source: | Nature Communications, 12 (1) (Art N° 551) | Abstract: | 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. The suppression of dark current in organic photodetectors (OPDs) is important for maximizing the performance of the devices. Here, the authors report the relationship between the high dark saturation current and the presence of mid-gap trap states in OPDs with a donor-acceptor structure. | Notes: | Kublitski, J; Hofacker, A (corresponding author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany.; Kublitski, J; Hofacker, A (corresponding author), Tech Univ Dresden, Inst Appl Phys, Nothnitzer Str 61, D-01187 Dresden, Germany.; Vandewal, K (corresponding author), Hasselt Univ, Inst Mat Onderzoek IMO, Wetenschapspk 1, BE-3590 Diepenbeek, Belgium. jonas.kublitski@tu-dresden.de; andreas.hofacker@tu-dresden.de; koen.vandewal@uhasselt.be |
Other: | Kublitski, J; Hofacker, A (corresponding author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany ; Tech Univ Dresden, Inst Appl Phys, Nothnitzer Str 61, D-01187 Dresden, Germany. Vandewal, K (corresponding author), Hasselt Univ, Inst Mat Onderzoek IMO, Wetenschapspk 1, BE-3590 Diepenbeek, Belgium. jonas.kublitski@tu-dresden.de; andreas.hofacker@tu-dresden.de; koen.vandewal@uhasselt.be | Document URI: | http://hdl.handle.net/1942/33778 | e-ISSN: | 2041-1723 | DOI: | 10.1038/s41467-020-20856-z | ISI #: | WOS:000613058000015 | Rights: | The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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