Long-Persistent Photoconductivity in Transistor Structures Made from Thin ZrS₃-Films

verfasst von

Lars Thole, Asem Ben Kalefa, Christopher Belke, Sonja Locmelis, Lina Bockhorn, Peter Behrens, Rolf J. Haug

Abstract

In the search for two-dimensional (2D) materials, transition-metal trichalcogenides (TMTCs) have emerged as promising candidates for optoelectronic applications. Here, we show a very long-lasting persistent photoconductivity (PPC) over several hours in thin films of the TMTC zirconium trisulfide (ZrS₃) at room temperature when illuminated with a 470 nm LED. ZrS₃ crystals were grown using chemical vapor transport. UV-vis spectroscopy showed an indirect band gap of 1.81 eV and an Urbach energy of 83 meV, indicating that the system has a large number of defects. Transistor measurements on thin layers with thicknesses varying between 19 and 50 nm showed ZrS₃ to be an n-type semiconductor. The conductivity increases under illumination, and it only reaches the original state several hours after switching off the illumination. This PPC can be described by using a stretched exponential function. On top of that, the sum of three exponential functions with tree different relaxation times fits the observed PPC nearly equally well. This shows that three processes dominate the relaxation. The three observed processes can be differentiated with respect to their origin by their dependence on the thickness of the thin layers.

Organisationseinheit(en)

QuantumFrontiers
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Institut für Festkörperphysik
Institut für Anorganische Chemie
Laboratorium für Nano- und Quantenengineering
Fakultät für Mathematik und Physik

Typ

Artikel

Journal

ACS Applied Electronic Materials

Band

5

Seiten

6286–6291

Anzahl der Seiten

6

Publikationsdatum

28.11.2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Werkstoffchemie, Elektrochemie

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1021/acsaelm.3c01163 (Zugang: Offen)