Showing papers by "Benoit Deveaud published in 1980"
01 Mar 1980
TL;DR: In this article, the authors performed photoluminescence experiments using two excitation sources: a YAG laser and a krypton laser, on a series of Chromium doped GaAs samples.
Abstract: We have performed photoluminescence experiments, using two excitation sources : a YAG laser and a krypton laser, on a series of Chromium doped GaAs samples. The carrier concentration of the samples ranges from 1018 (n-type) to p-type (lightly doped). Three bands of photoluminescence at 0.57 eV, 0.61 eV and 0.839 eV are associated with Chromium. Their respective variations with excitation source and Fermi level position are reported. A tentative explanation in terms of the Configurational-Coordinate model for the (Cr 3+-Cr2+) centre is presented.
13 citations
01 Jan 1980
TL;DR: In this paper, the authors used current transient spectroscopy (OTCS) to give the electrical characteristics of traps in semi-insulating material, as classic DLTS is in n- or p-type semiconductors.
Abstract: Current transient spectroscopy (OTCS) is known to be able to give the electrical characteristics of the traps in semi-insulating material, as classic DLTS is in n- or p-type semiconductors. The method is limited by difficulties occurring for very deep traps. We explain here the difficulties — mainly the occurrence of negative transients — and set up an experimental procedure to interpret the data. Our first results show that, in Bridgman GaAs:Cr, the HL1 and EL2 levels are not the only levels that are present. At comparable concentration, the HL1 trap can be detected but the EL2 trap cannot.
5 citations
01 Jan 1980
TL;DR: In this article, another possible explanation for the luminescence band at 0.839 eV GaAs was proposed. But this interpretation has already been excluded and a new interpretation has been proposed by White.
Abstract: The often observed luminescence band at 0.839 eV GaAs: Cr is generally interpreted as an internal transition (5E-5T2) of the Cr2+ ion. This interpretation has already been excluded and a new interpretation has been proposed by White. We present here another possible explanation.