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

In this paper, dark current-voltage (I-V) characteristics, current-temperat ure (I-T) characteristics, and photocurrents under steady-state X-ray excit ation of CVD diamond films were investigated. Results indicated that dark c urrents and photocurrents by X-ray irradiation for the [001] textured CVD d iamond film were greater than those for the non-textured one. The differenc es 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 whic h was normally attributed to Si trapped to a vacancy in the diamond lattice . (C) 2000 Elsevier Science S.A. All rights reserved.