Search results for "Carrier scattering"

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Tin-related double acceptors in gallium selenide single crystals

1998

Gallium selenide single crystals doped with different amounts of tin are studied through resistivity and Hall effect measurements in the temperature range from 30 to 700 K. At low doping concentration tin is shown to behave as a double acceptor impurity in gallium selenide with ionization energies of 155 and 310 meV. At higher doping concentration tin also introduces deep donor levels, but the material remains p-type in the whole studied range of tin doping concentrations. The deep character of donors in gallium selenide is discussed by comparison of its conduction band structure to that of indium selenide under pressure. The double acceptor center is proposed to be a tin atom in interlayer…

Electron mobilityHole MobilityAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_elementMineralogyDeep LevelsCondensed Matter::Materials Sciencechemistry.chemical_compound:FÍSICA [UNESCO]Condensed Matter::SuperconductivitySelenideNuclear ExperimentConduction BandsGallium Compounds ; III-VI Semiconductors ; Tin ; Impurity States ; Deep Levels ; Electrical Resistivity ; Hall Effect ; Hole Mobility ; Conduction BandsImpurity StatesElectrical ResistivityHall EffectIII-VI SemiconductorsPhonon scatteringCarrier scatteringDopingUNESCO::FÍSICAAcceptorchemistryTinGallium CompoundsTinIndiumJournal of Applied Physics
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Energy transport in silica to oxygen-deficient luminescence centers. Comparison with other luminescence centers in silica and α-quartz

2004

Abstract The transport of energy absorbed by silica glass to oxygen-deficient luminescence centers in was studied in the range of intrinsic absorption from 8.2 up to 35 eV. The low efficiency of exciting those luminescence centers by transport of energy could not be ascribed merely to carrier scattering by the disordered structure. Other centers (Cu + , for example) could be excited in such process with sufficiently high efficiency, albeit lower than that in crystals. The low efficiency of interaction of oxygen deficient centers with quasi-particles is attributed to isolation of these centers in clusters and the non-radiative annihilation of the quasi-particles on the boundaries of these cl…

PhotoluminescenceAbsorption spectroscopyImpurityCarrier scatteringChemistryExcited stateDopingMaterials ChemistryAnalytical chemistryGeneral ChemistryCondensed Matter PhysicsLuminescenceAbsorption (electromagnetic radiation)Solid State Communications
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