The proposed project deals with the fabrication and characterisation of organic near-infrared (NIR) photodetectors. Therefore, we investigate new organic cyanine dyes that have narrow absorptions with maxima beyond 1100 nm. Optical sensing at wavelengths beyond the silicon band-edge is important for a number of applications in biology, sensors and optical communications. Another merit of these organic materials compared to silicon detectors is the selective absorption of NIR light which allows the fabrication of detectors that are highly transparent for visible light. For this purpose we will also investigate the application of transparent conductive top electrodes. Both research groups in Switzerland and Brazil have considerable experience in fabricating and analysing organic semiconducting devices with specialisation to either chemistry (Empa) or physics (PUC-Rio). The collaboration may therefore bring different expertise together with added values for both partners. This exchange visit also serves to strengthen and consolidate an ongoing collaboration to develop all-organic upconversion devices.
Prof. Frank Nüesch
Prof. Marco Cremona