Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.45: Poster

Montag, 9. März 2026, 19:00–21:00, P5

In-situ FTIR spectroscopy on organic semiconductor electric double-layer transistors — •Marvin Schmidt¹, Pushi Wang², Jun Takeya^2,3, and Martin Dressel¹ — ¹1. Physikalisches Institut, Universität Stuttgart, Germany — ²Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan — ³Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan

The field of organic electronics is ever-growing due to the enormous range of unique properties and possible applications exhibited by organic molecules. Electric double-layer transistors (EDLTs) consisting of the organic semiconductor 3,11-dinonyldinaphtho[2,3-d:2′,3′-d’]benzo[1,2-b:4,5-b’]dithiophene (C₉-DNBDT-NW) have recently attracted attention because they are highly processable and, thus, allow for the fabrication of large-scale single-crystal transistors with excellent crystallinity and high mobility. Furthermore, Hall effect measurements indicate the emergence of a metallic phase with strong correlations upon doping.

Here, we performed, for the first time, in-situ Fourier-transform infrared spectroscopy on EDLTs composed of C₉-DNBDT-NW single crystals for different sheet conductivities and temperatures down to 6K in the mid and far infrared regions. Our results give insights into how thermal fluctuations are suppressed with decreasing temperature and increasing electrostatic doping concentration, which manifests itself in the behavior of the displaced Drude peak.

Keywords: FTIR spectroscopy; EDLTs; organic semiconductors; organic electronics