SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.11: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Investigation of Metal–Insulator Transitions in Organic Field-Effect Transistors of an n-Type Organic Semiconductor — •Paul Schlachter1, Maximilian Frank1, Matthias Stolte2, Frank Würthner2, and Jens Pflaum1,3 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2Institut für Organische Chemie and Center for Nanosystems Chemistry, University of Würzburg, 97074 Würzburg — 3ZAE Bayern, 97074 Würzburg
Metal-insulator transitions in organic materials offer many exciting applications and are therefore gaining increasing scientific as well as technological interest. In this work, we aim to investigate electronic field-effect-induced phase transitions (semiconductor → conductor → insulator) in organic single crystals (especially Cl2NDI [1]) of high electron mobility. The long-range order of their molecular entities in combination with a preferred (001) gliding plane geometry provides the pre-condition of a nearly defect-free interface for studying quasi-two-dimensional electron gas formations. For this purpose, we use an electrolyte as a top gate in addition to a dielectric conventional back gate. By simultaneously varying the bottom and top gate voltages, respectively, we aim to control the charge carrier density and thereby to gain deeper insights into Mott physics. First results on these efforts will be presented and evaluated with respect to the possible implementation in Mott field-effect transistors.
[1] Tao He et al., Nat. Commun. 2015, 6, 5954