SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: Organic Electronics and Photovoltaics III (joint session CPP/HL)

CPP 43.4: Talk

Thursday, March 30, 2023, 10:15–10:30, GÖR 226

Utilizing High Gain and Spectral Narrowing for Near-Infrared Organic Photodetectors — •Louis Conrad Winkler¹, Jonas Kublitski², Johannes Benduhn¹, and Karl Leo¹ — ¹TU Dresden, Germany — ²Federal University of Technology Paraná UTFPR, Curitiba, Brazil

There is a multitude of applications for infrared photodetectors that demand high-volume fabrication, including blood oxygen determination, continued monitoring of food quality, control of industrial processes, and many more. Organic photodetectors (OPDs) have great potential to enrich today*s photodetector marked with their low-cost fabrication, flexible devices and tunable response. However, most studied organic semiconducting materials have neglectable absorption above 1000 nm. This contribution presents a donor-acceptor blend with a low-energy and broad charge-transfer (CT) feature. To overcome the inherent increase of charge carrier recombination of such low-energy systems, we introduce two photocurrent multiplication (PM) mechanisms. By embedding this OPD into an optical micro-cavity, a spectral response (SR) of 15 AW-1 at 1095 nm is achieved. Furthermore, a very narrow response of only 18 nm makes this architecture ideal for spectroscopic resolved measurements that could be easily integrated into CMOS readout circuitry due to the optimization for operation under reverse bias.