Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 17: 2D Semiconductors and van der Waals Heterostructures III
HL 17.1: Talk
Tuesday, March 18, 2025, 09:30–09:45, H15
Size-Dependent Electrical Transport in Quasi-1D ZrSe3-Stripes — •Davin Höllmann1, Lars Thole1, Sonja Locmelis2, and Rolf J. Haug1,3 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany — 2Institut für Anorganische Chemie, Leibniz Universität Hannover, 30167 Hannover, Germany — 3Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover, 30167 Hannover, Germany
The anisotropy in form of quasi one-dimensional (1D) chains in transition metal trichalcogenides (TMTCs) makes them stand out compared to other more conventional two-dimensional (2D) materials [1]. Building on previous work [2], we investigated the electrical properties of thin stripes of the TMTC ZrSe3 particularly regarding their width and thickness. The bulk material used was fabricated by a chemical vapor transport method and then exfoliated to achieve thin stripes.
We determined band gap energies for samples with varying heights. Those are shown to increase linearly from 0.37 eV to 0.63 eV as the thickness of the material decreases from 35 nm to 14 nm. Furthermore, we compared narrow samples with wider samples where both have comparably similar length and thickness and found that the conductivity happens dominantly in the outer selenium atoms i.e. across the chains.
[1] J. O. Island et al., 2D Materials 4, 0220033 (2017)
[2] L. Thole et al., ACS Omega 7, 39913-39916 (2022)
Keywords: Transition Metal Trichalcogenides; ZrSe3; Electrical transport; Band gap; Size effect