Investigation of the electrical properties of thallium monosulphide single crystals

Abstract

The preparation and electrical properties of thallium monosulphide single crystals are reported in the present work. Measurements of electrical conductivity and Hall coefficient were performed over the temperature range 215-415 K. The study was carried out with the current flowing parallel to the c axis and the magnetic direction perpendicular to the c axis. The crystals obtained had p-type conductivity with a hole concentration of 1.18*1010 cm-3 at room temperature. Conductivity and Hall mobility at 300 K were evaluated as 5.01*10-6 Omega -1 cm-1 and 2511.89 cm2 V-1 s-1 respectively. The energy-gap width was found to be 1.37 eV. An anomalous behaviour of the temperature dependence of Hall mobility was noticed.