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


Dublin Core Export

<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Kublitski, Jonas</dc:creator>
  <dc:creator>Hofacker, Andreas</dc:creator>
  <dc:creator>K. Boroujeni, Bahman</dc:creator>
  <dc:creator>Benduhn, Johannes</dc:creator>
  <dc:creator>C. Nikolis, Vasileios</dc:creator>
  <dc:creator>Kaiser, Christina</dc:creator>
  <dc:creator>Spoltore, Donato</dc:creator>
  <dc:creator>Kleemann, Hans</dc:creator>
  <dc:creator>Fischer, Axel</dc:creator>
  <dc:creator>Ellinger, Frank</dc:creator>
  <dc:creator>Vandewal, Koen</dc:creator>
  <dc:creator>Leo, Karl</dc:creator>
  <dc:date>2020-11-26</dc:date>
  <dc: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.</dc:description>
  <dc:identifier>https://archive.materialscloud.org/record/2020.152</dc:identifier>
  <dc:identifier>doi:10.24435/materialscloud:sq-wv</dc:identifier>
  <dc:identifier>mcid:2020.152</dc:identifier>
  <dc:identifier>oai:materialscloud.org:644</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>Organic Photodetectors</dc:subject>
  <dc:subject>Dark current</dc:subject>
  <dc:subject>Traps</dc:subject>
  <dc:subject>Detectivity</dc:subject>
  <dc:title>Reverse dark current in organic photodetectors and the major role of traps as source of noise</dc:title>
  <dc:type>Dataset</dc:type>
</oai_dc:dc>