Photocapacity measurements on natural semiconducting diamond

Abstract
Photocapacity spectra have been obtained for Schottky barriers on natural semiconducting diamond using photon energies between 0.8 and 4.0 eV. The results indicate the presence of a deep level approximately 1.4 eV above the valence band. In reaching this conclusion independent evidence regarding the donor nature of this level has been used, and it has been assumed that electrons are excited from the valence band to ionised donors in the depletion layer in a two-step process via ionised acceptors. This is the reverse process to donor-acceptor pair recombination.