Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics I

CPP 22.3: Talk

Tuesday, March 10, 2026, 10:15–10:30, ZEU/0260

Reassessing Mobility Imbalance in Organic Photodetectors for High-Speed Applications — •Felix Hergenhan, Tianyi Zhang, Karl Leo, and Johannes Benduhn — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute of Applied Physics, Technische Universität Dresden

Organic photodetectors (OPDs) are emerging candidates for diverse optoelectronic applications, yet their use in high-speed technologies such as optical communication remains largely believed to be restricted by low effective charge carrier mobilities. To address this challenge, we investigated how the transient behavior of OPDs depends on the mobilities of the respective charge carriers. This relationship is examined through drift-diffusion simulations and experiments across various material systems, under varied bias and illumination conditions. We show, contrary to common assumptions, that obtaining only one fast charge carrier mobility is sufficient to achieve high response speed. Likewise, in systems with pronounced mobility imbalance, the slower carriers do not necessarily govern the maximum operation speed of the device. Leveraging these insights, we demonstrate an OPD tailored for optical communication that achieves data transmission rates up to 170 Mbps, representing one of the highest reported transmission rates for organic-based optical communication systems. These findings establish a refined design framework for ultrafast OPDs, providing guidance on material selection, device design, and operation regimes.

Keywords: organic photodetectors; mobility imbalance; ultrafast response; optical communication