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Campo DC | Valor | Lengua/Idioma |
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dc.contributor.author | ROJAS LÓPEZ, MARLON | - |
dc.date.accessioned | 2012-11-26T21:22:24Z | - |
dc.date.available | 2012-11-26T21:22:24Z | - |
dc.date.issued | 2012-11-26 | - |
dc.identifier.uri | http://www.repositoriodigital.ipn.mx/handle/123456789/8557 | - |
dc.description | Article | es |
dc.description.abstract | We report on the preparation of photoluminescent porous GaAs by the application of high voltage spark discharges in atmospheres of pure oxygen, pure nitrogen, and in mixed N2:O2 ratios of 4:1 and 1:4. The spark-processed porous ~spp! samples were characterized by the observation of their visible photoluminescence ~PL! when illuminated with UV monochromatic radiation. Some differences are observed in the initial PL spectra of the spp-GaAs according to the atmosphere of preparation under similar sparking and time conditions. The PL consists of two dominant bands, a yellow-green band between ;2.2 and 2.6 eV and a blue-violet band, centered at 3.1 eV. Comparison with Raman and PL results from As2O3 and As2O5 indicates that the PL in the spp-GaAs is produced by the formation of these compounds by exposure to oxygen during the preparation. This is reinforced by energy dispersive x-ray spectroscopy measurements that indicate that the spp-GaAs is always oxidized, even when prepared under a nitrogen flow. The blue-UV emission at 3.1 eV suggests that we cannot rule out confinement as a contributing mechanism for this PL. Raman spectra indicate that for samples prepared in pure nitrogen, the resulting material consists of amorphous As and GaAs, and the cubic form of As2O3 , arsenolite. PL and Raman indicate that there exists an increasing degree of amorphization of the resultant material with the introduction of nitrogen in the preparation atmosphere. © 2000 American Institute of Physics. S0021-8979(00)01203-2 | es |
dc.description.sponsorship | Instituto Politécnico Nacional CIBA-Tlaxcala | es |
dc.language.iso | en | es |
dc.subject | porous GaAs | es |
dc.title | Dependence on the atmosphere of preparation of the luminescence of spark processed porous GaAs | es |
dc.type | Article | es |
dc.description.especialidad | Medico-Biológicas | es |
dc.description.tipo | es | |
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