SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.14: Poster

Monday, March 27, 2023, 18:00–20:00, P3

Organic Photoconductors based on Rubrene Thin-Films — •Jonas Schroeder, Rishabh Rishabh, Johannes Benduhn, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany

Thin films of organic semiconductors possess huge potential for large-scale industrial applications. However, the limited possibilities of crystal growth directly on the substrates often restrict device concepts but also achievable device performance. Here, we use vacuum-deposited rubrene in combination with a thermal post-treatment to fabricate different morphologies of polycrystalline thin films. To take advantage of the high in-plane mobility (3 cm² V⁻¹ s⁻¹) of the well-known orthorhombic rubrene phase in light detection applications, we employ photoconductive detectors in which the contacts are placed laterally on the sides of the active material. This allows for decoupling of the filtering of the incident light from the channel geometry and a photocurrent gain due to the natural imbalance of electron and hole mobilities in organic semiconductors. We show performance benchmarks of prototypical photoconductive organic photodetectors and relate these to the optical and electrical properties of the used rubrene thin films.