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HL: Fachverband Halbleiterphysik

HL 33: 2D Materials and Heterostructures: Optoelectronics

HL 33.5: Talk

Wednesday, March 20, 2024, 16:00–16:15, EW 201

Persistent Photoconductivity in Thin Films of ZrS₃ — •Lars Thole¹, Asem Ben Kalefa¹, Christopher Belke¹, Sonja Locmelis², Lina Bockhorn¹, Peter Behrens², and Rolf J. Haug¹ — ¹Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany — ²Institut für Anorganische Chemie, Leibniz Universität Hannover, 30167 Hannover, Germany

The field of two dimensional materials includes a large variety of materials. Among these, the group of transition metal trichalcogenides (TMTCs) has so far been lesser researched. Here, we have prepared transistor structures from thin films of the TMTC ZrS₃. In our samples, we found a particularly long persistent photoconductivity (PPC) which lasts over several hours, similar to what was seen in MoS₂ [2]. Looking at the temperature dependence gives information about the scattering times involved. In addition to using a stretched exponential function to fit the data, we can use a combination of three exponential functions. This shows that there are three processes involved in the origin of the PPC in our samples. These processes can be characterized by looking at samples with different thicknesses.

[1] L. Thole et al., ACS Appl. Electron. Mater., 5, 11, 6286 (2023)

[2] Y. Wu et al., Sci. Rep., 5, 11472 (2015)

Keywords: transition-metal trichalcogenides; ZrS3; persistent photoconductivity; field effect; defects