Near-infrared organic photodiodes

Francesco Arca, Maria Sramek, Sandro Francesco Tedde, Paolo Lugli, Oliver Hayden

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Organic photodiodes (OPDs) are attractive as solution-processed devices for sensing applications. Industrial and medical sensors often have the requirement to operate in the near-infrared (NIR) spectrum between 650 and 900 nm and are ideally visible-blind. Due to the tailored spectral sensitivity of the organic semiconductors, OPDs are attractive as filter-free solid-state alternative. In addition, the large active areas of the OPDs potentially allow fabricating lens-free light-barrier and reflective sensors. In this paper, we discuss different approaches toward NIR sensitive OPDs with a large active area up to 1 cm2 applying polymers and small molecules as light absorbers. We demonstrate that with layer stacks optimized to the solution-processed semiconductor properties photodiodes with bulk heterojunctions with a minimum external quantum efficiency peak >40% in the NIR and a rectification ratio of ~105 can be achieved, which match industrial sensing requirements.

Original languageEnglish
Article number2285158
Pages (from-to)1016-1025
Number of pages10
JournalIEEE Journal of Quantum Electronics
Issue number12
StatePublished - 2013
Externally publishedYes


  • Near-infrared
  • Organic
  • Photodiode
  • Semiconductor
  • Sensor


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