"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Polarization mechanisms of TlSbS2 thin films

SAHIN YAKUT1, DENIZ DEGER1, DENIZ BOZOGLU1, KEMAL ULUTAS1,*

Affiliation

  1. Istanbul University, Science Faculty, Physics Department, Vezneciler/Fatih/Istanbul, 34134, Turkey

Abstract

TlSbS2 is a material having good photovoltaic and thermoelectric properties in bulk form. Electrical characteristics are important to analyze such properties as photovoltaic and thermoelectric. Improvements in industrial and technological applications required materials having low size. Thus, it is important to analyze this material in nano-size dimensions. For this reason, TlSbS2 was investigated in thin film form. To make the detailed characterization of dielectric properties enabled, the dielectric investigation of TlSbS2 thin films was operated depending on frequency, temperature, and film thickness. In this study, TlSbS2 thin films are produced by the deposition of TlSbS2 bulk samples by thermal evaporation on glass substrates. The thicknesses of the films are between 49 and 619 nm. The dielectric properties and ac conductivity of the TlSbS2 thin films at a temperature range 293-373 K are measured over a frequency range between 20 Hz and 1kHz. The dielectric constant increases with increasing thickness starting from almost 10 to almost 30. Two polarization mechanisms are observed. One of them can be related to the interfacial polarization of partially free charge carriers including atom groups constructed from combinations of Tl, Sb, and S or individual atoms of Tl, Sb, and S. The polarization of bonds between Tl-S and Sb-S inside local crystal states can be attributed to orientational (dipolar) polarization. Activation energies of the polarization mechanisms are determined. In addition to dielectric spectroscopy measurements, XRD analysis results show that the TlSbS2 bulk samples (raw samples used for the deposition of thin films) are in crystalline form. However, TlSbS2 thin films deposited from TlSbS2 bulk samples by thermal evaporation are found to be amorphous. The relationship between the structure of the material and its dielectric properties is studied..

Keywords

TlSbS2 compounds, Thin films, dielectric properties, AC conductivity, Thickness dependence.

Submitted at: May 23, 2022
Accepted at: June 9, 2023

Citation

SAHIN YAKUT, DENIZ DEGER, DENIZ BOZOGLU, KEMAL ULUTAS, Polarization mechanisms of TlSbS2 thin films, Journal of Optoelectronics and Advanced Materials Vol. 25, Iss. 5-6, pp. 294-301 (2023)