Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 86: Organic Electronics and Photovoltaics III

CPP 86.5: Vortrag

Donnerstag, 19. März 2020, 10:30–10:45, ZEU 260

Organic narrowband near-infrared photodetectors for industrial applications — •Johannes Benduhn1, Rico Meerheim1,2, David Wynands1,2, Marcel Dahms2, Paul Vincze2, and Robert Brückner1,21Institut für Angewandte Physik, Technische Universität Dresden, Dresden, Germany — 2Senorics GmbH, Dresden, Germany

Near-infrared (NIR) spectroscopy is a powerful method to analyse the composition of various analytes. Nowadays, this method is mainly used in well-equipped laboratories since todays spectrometers are very large and expensive. To overcome these limitations, we present organic photodetectors which enable narrowband detection of NIR photons with full width at half maximum down to 15 nm and can be produced easily and cost efficiently. These detectors are based on organic donor-acceptor blends forming an NIR-absorbing charge-transfer state which is massively enhanced by utilizing an optical micro-cavity. Tuning the cavity resonance, different wavelengths can be detected. Placing different of such detectors in an array results in a miniaturized lateral spectrometer which can be employed to measure for example moisture content of carton, using a reflection geometry. In the near future, such miniaturized spectrometers can be used to optimize the production of paper and carton by controlling the moisture content. Furthermore, various related applications and products can be addressed.

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