Color Determination from a Single Broadband Organic Photodiode

Color Determination from a Single Broadband Organic Photodiode

Dyson, M.J.
Verhage, M.
Ma, X.
Simone, G.
Tordera, D.
Janssen, R.A.J.
Gelinck, G.H.

2020

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.

Charge extraction
Indium gallium zinc oxide
Organic photodiodes
Spectral selectivity
Trap states

http://resolver.tudelft.nl/uuid:8a8d1f94-d32a-4efa-bac4-fa3e9292c7f1

https://doi.org/10.1002/adom.201901722

955315

Wiley-VCH Verlag

2195-1071

Advanced Optical Materials, 8 (8)

article