Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201901722
Keywords
charge extraction; indium gallium zinc oxide; organic photodiodes; spectral selectivity; trap states
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Funding
- Marie Sklodowska-Curie Actions Innovative Training Network H2020-MSCAITN-2014 INFORM [675867]
- Ministry of Education, Culture and Science [024.001.035]
- Marie Curie Actions (MSCA) [675867] Funding Source: Marie Curie Actions (MSCA)
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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 approximate to 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.
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