Color determination from a single broadband organic photodiode

Matthew J. Dyson, Michael Verhage, Xiao Ma, Giulio Simone, Daniel Tordera, René A.J. Janssen, Gerwin H. Gelinck (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
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Abstract

Establishing the color of incident light is essential for many applications, such as machine vision, but generally requires either a dispersive component or multiple spectrally selective photodetectors. In contrast, here an incident spectrum is parametrized using a single broadband organic photodiode (OPD). This is achieved by exploiting the incident wavelength dependence of charge extraction caused by optically induced trap states in a metal oxide electron extraction layer, which results in an atypical spectral dependence of the reverse bias photocurrent density vs voltage (J–V) characteristics. Such dependence is augmented by confining the active layer within an optical microcavity to influence the light absorption profile and thus metal oxide trap state density. The average wavelength of an (approximately normally distributed) incident spectrum is then calculated to within ≈5 nm by algorithmically minimizing the difference between a measured J–V curve and one determined from the overlap integral of a trial spectrum with previously acquired voltage bias dependent external quantum efficiency (EQE) spectra.

Original languageEnglish
Article number1901722
Number of pages9
JournalAdvanced Optical Materials
Volume8
Issue number7
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • charge extraction
  • indium gallium zinc oxide
  • organic photodiodes
  • spectral selectivity
  • trap states

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