Characterıstıcs of Electrıcal Current Relaxatıon in Monocrystal TlInSe2
Abstract
This study investigates the volt-ampere characteristic of the TlInSe2 compound at various temperatures, as well as the relaxation of electric current across different voltages (corresponding to varying electric field intensities) at a temperature of 300 K. From the volt-ampere characteristic analysis, we calculated the concentration of free charge carriers, mobility, and trap concentration, yielding values of n0 = 5.45‧1018 сm-3, μ = 3.03∙10-3 сm2/V∙san, and Nₜ = 5.2 × 10¹⁰ cm⁻³, respectively. The dependence of electrical conductivity on temperature revealed local energy levels with activation energies of 0.2 eV and 0.53 eV in the TlInSe2 crystal. It was found that at low, constant voltages (where the electric field intensity E < 25 V/m), relaxation processes occur within the TlInSe2 compound, leading to a decrease in current due to charge accumulation. At higher voltages (where E > 25 V/m), an increase in current was observed. This increase was attributed to the injection of charge carriers from the contacts, the discharge of charges accumulated near the contact under the influence of the electric field, and the partial discharge of electron centres.
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