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

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <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: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:publisher>Materials Cloud</dc:publisher>
  <dc:rights>Creative Commons Attribution 4.0 International</dc:rights>
  <dc:subject>Organic Photodetectors</dc:subject>
  <dc:subject>Dark current</dc:subject>
  <dc:title>Reverse dark current in organic photodetectors and the major role of traps as source of noise</dc:title>