Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics IV
CPP 40.6: Vortrag
Mittwoch, 11. März 2026, 18:15–18:30, ZEU/LICH
Current Generation in Photomultiplication-type Organic Photodetectors — •Louis Conrad Winkler1,2, Jonas Kublitski1,3, Awais Sarwar1, Hrisheekesh Thachoth Chandran1, Wolfgang Tress4, Urs Aeberhard5, Karl Leo1, and Johannes Benduhn1,2 — 1IAPP, TU Dresden, Germany — 2DZA, Görlitz, Germany — 3Departamento de Fisica, UTFPR, Curitiba, Brazil — 4ZHAW, Winterthur, Switzerland — 5FLUXiM, Winterthur, Switzerland
Organic photodetectors (OPDs) utilizing intrinsic gain promise enhanced performance in regard to faint light detection. While this gain mechanism boosts the external quantum efficiency (EQE), the associated noise often negates the net improvement of the specific detectivity D*. Nonetheless, the simplified readout circuitry and associated cost savings hold high potential for the market. Crucially, the origin of this photomultiplication (PM) effect is currently attributed to tunnel injection of charge carriers, driven by internal band bending due to trapped charge carriers. Here, we challenge this prevailing tunnel injection model based on comprehensive experimental evidence. We propose an alternative mechanism that offers a unified explanation for the gain observed across diode-like OPD architectures and validate it by drift-diffusion simulations. This model successfully provides general predictive capabilities regarding the magnitude and dependencies of the photocurrent gain. We rigorously tested this proposed mechanism across 29 diverse material systems, including both vacuum-processed and solution-processed devices.
Keywords: organic; gain; multiplication; injection; tunneling