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Color Determination from a Single Broadband Organic Photodiode
Author(s) -
Dyson Matthew J.,
Verhage Michael,
Ma Xiao,
Simone Giulio,
Tordera Daniel,
Janssen René A. J.,
Gelinck Gerwin H.
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901722
Subject(s) - materials science , photocurrent , photodiode , optoelectronics , biasing , wavelength , ray , photodetector , quantum efficiency , optics , spectral line , optical power , voltage , physics , laser , quantum mechanics , astronomy
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.