Investigation of trapping centers in single-crystal niobium dioxide by admittance spectroscopy

Abstract

Investigation of trap parameters in single-crystal niobium dioxide is performed employing the admittance spectroscopic method. From conductance and capacitance measurements versus temperature at different frequencies, five trap levels with energies of 0.25-0.435 eV were identified. Other characteristic parameters were determined including trap density, capture cross section, and emission rate. Measured values of these parameters indicate the existence of two groups of traps.