Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics IV
CPP 40.4: Talk
Wednesday, March 11, 2026, 17:45–18:00, ZEU/LICH
Enhanced Photo-multiplication Effect through Synergistic Hole Blocking and Traps Engineering in OPDs — •Awais Sarwar1, Louis Conrad Winkler1,2, Karl Leo1, and Johannes Benduhn1,2 — 1IAPP, TU Dresden, Germany — 2DZA, Görlitz, Germany
Photomultiplication-type organic photodetectors (PM-OPDs) are highly effective for detecting weak light. However, they often face a significant trade-off: high gain usually results in excessive noise and slow response times. To overcome these limitations, we introduce a vacuum-deposited broadband photodetector architecture that utilizes the synergistic integration of hole-blocking layers and precise traps engineering. By strategically controlling the charge injection barriers and trap distribution, this design effectively separates the gain mechanism from the noise floor. The resulting device achieves a peak external quantum efficiency (EQE) exceeding 1100 per cent, while maintaining a specific detectivity of 4.4*10e12 Jones at a bias of -2 V. Unlike slow trap-dominated systems, our optimised architecture keeps a cutoff above 25 kHz. Vacuum-deposited PM-OPDs offer high sensitivity and fast response, ideal for real-time sensing.
Keywords: Photomultiplication; organic; Response speed; Traps; hole blocking