Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.18: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Organic Narrowband Near-infrared Photodiodes for Breath Monitoring — •Sudhi Mahadevan1,2, Siddhartha Saggar1,2, Rabiul Islam1,2, and Caroline Murawski1,2 — 1Institute of Solid-State Electronics, Technische Universität Dresden, 01062 Dresden, Germany — 2Kurt Schwabe Institute for Sensor Technologies, Kurt-Schwabe-Straße 4, 04736 Waldheim, Germany
For clinical diagnosis of various diseases, breath analysis has become a powerful non-invasive tool, which demands the development of reliable and efficient sensing technologies. However, conventional respiratory monitors hinder users’ mobility, provide discomfort, and affect natural breathing patterns. Recent progress in organic and wearable optoelectronics presents an opportunity to develop thin, flexible, and imperceptible sensors. In this work, we report high-performance near-infrared (NIR) organic photodiodes (OPD), using a PM6:Y6 blend combining a polymer donor with an NIR-absorbing small molecule processed from the green solvent o-xylene. In this simplified device architecture, the hole-blocking functionality is incorporated directly into the active layer, reducing fabrication complexity and enabling cost-effective production. A narrow-band optical response at 800 nm is achieved via an organic photo-filtering layer that allows only long-wavelength photons into the active layer. The optical breath sensor will integrate organic light-emitting diodes (OLEDs) to emit light onto the chest, while an OPD will capture changes in diffusely scattered light from the skin during breathing. This work aims to advance organic electronic devices into the NIR spectrum for non-invasive medical diagnosis applications.
Keywords: organic photodiodes; healthcare applications; Near-infrared absorbing materials; Organic semiconductors; narrow band organic photodetection