Some optical and electrical properties of semiconducting diamonds

Abstract

Two semiconducting (Type IIb) diamonds were examined for some of their optical and electrical properties. The energies of the extra absorption bands in the infrared typical to Type IIb specimens were found to fit very well the thermal activation energies obtained both from the dark conductivity and the thermoluminescence. The experiments indicate discrete levels of 0̃21, 0̃30, 0̃37, 0̃52 and about 0̃7 eV above the valence band. Nearly the same spectral distribution was found for the u.v. excited luminescence, the electroluminescence, and the thermoluminescence, all having their main maximum at about 0̃48 μ. Excitation spectra for the thermoluminescence and the photoconductivity were also measured. Some other experiments describe the conductivity and voltaic glow curves of the same specimens.