Electrical properties of chemical vapor deposition diamond films and electrical response to X-ray

摘要

In this paper, dark current-voltage (I-V) characteristics, current-temperature (I-T) characteristics, and photocurrents under steady-state X-ray excitation of CVI) diamond films were investigated. Results indicated that dark currents and photocurrents by X-ray irradiation for the (001) textured CVD diamond film were greater than those for the non-textured one. The differences in dark currents and resistivities were attributed to a large number of grain boundaries contained in the non-textured diamond films. From the I-T curves, at the temperature higher than 500 K, currents clearly followed an exponential behavior because of the activation energy of E_a = 1.68 eV which was normally attributed to Si trapped to a vacancy in the diamond lattice.