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Neutron irradiation defects in gallium sulfide : Optical absorption measurements

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Neutron irradiation defects in gallium sulfide : Optical absorption measurements

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Manjón Herrera, Francisco Javier; Segura García del Río, Alfredo; Muñoz Sanjosé, Vicente

Aquest document és un/a article, creat/da en: 1997

Este documento está disponible también en : http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000081000010006651000001&idtype=cvips&prog=normal&doi=10.1063/1.365204

Gallium sulfide single crystals have been irradiated with different thermal neutron doses. Defects introduced by neutron irradiation turn out to be optically active, giving rise to absorption bands with energies ranging from 1.2 to 3.2 eV. Bands lying in the band-gap exhibit Gaussian shape. Their energies and widths are independent of the irradiation dose, but their intensities are proportional to it. Thermal annealing is completed in two stages, ending at around 500 and 720 K, respectively. Centers responsible for the absorption bands are proposed to be gallium-vacancy-galliuminterstitial complexes in which the distance between the vacancy (acceptor) and the interstitial (donor) determines the energy and intensity of the absorption band, as well as the annealing temperature.

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