AC and dielectric properties of vacuum evaporated InTe bilayer thin films

III-VI compound semiconductors receive great attention due to its applications in memory devices, switching devices, gas sensors, hybrid solar cells. etc. InTe thin films were prepared by sequential thermal evaporation of In and Te at Ar atmosphere. X-ray diffraction pattern of the films shows that the films posses mixed phase of In2Te3 and In2Te5. Grain size (D) and dislocation density were calculated by using Scherer's formula. Surface morphology of the film is analyzed by SEM and the surface is found to be agglomeration of well defined grains. EDS analysis reveals that elemental composition is in right stoichiometry. The value of capacitance and tan delta was recorded with respect to different frequencies and at different temperatures. It is observed that the capacitance decreases with increase in frequency at all temperatures. The observed nature of the capacitance is due to the inability of the dipoles to orient in a rapidly varying electric field. The pronounced increase in capacitance toward the low frequency region may be attributed to the blocking of charge carriers at the electrodes which leads to space charge layer resulting in the increase of capacitance. The mechanism responsible for AC conduction is found to be electronic hopping. TCC and TCP values were calculated and the results are discussed. (C) 2010 Elsevier B.V. All rights reserved.