Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.24: Poster
Monday, March 9, 2026, 19:00–21:00, P5
QD-based hybrid organic photo detectors for narrowband IR sensing — •Johann Demel1, Louis Conrad Winkler1,3, Andrey Iodchik2, Moritz Flemming1, Tobias Antrack1, Karl Leo1, and Johannes Benduhn1,3 — 1IAP, TU Dresden — 2Chemistry, TU Dresden — 3German Center for Astrophysics
The ability to detect infrared radiation is relevant across a multitude of fields. Autonomous driving and deep space exploration utilize its ability to propagate long distances with little absorption losses. While, e.g., medical diagnostics can profit from its penetration depth into biological tissue. Organic materials have proven to be a viable platform for photo detection, with advantages such as low-cost fabrication, flexible devices, and tunable absorption; however, their IR absorption capabilities are limited.
This work presents a hybrid structure combining organic transport layers and PbS nanoparticles into optical microcavities. Based on transfer-matrix simulations, the resonance wavelength of the stack can be precisely predicted and tuned by adjusting the thickness of the organic transport layers. By combining precise thermal evaporation of the organic layers with interface assembly to incorporate nanoparticle layers into the stack, wavelength-selective devices are achieved whose resonance feature can be tuned from 750 nm up to 1800 nm. This expands the advantageous properties of the organic device framework by the wavelength-tunable IR absorption capabilities of semiconductor nanoparticles, leading to devices with specific detectivity values D* of 1011 cm·√Hz· W−1 (based on noise measurements).
Keywords: Nanoparticles; OPD; Microcavity; Interface Assembly; IR Sensing