Observation of the Ga Self-Interstitial Defect in GaP

Lee, K. M.

doi:10.1557/proc-104-449

Cited by 13 publications

(1 citation statement)

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“…The spin concentration in GaP nanoparticles exceeds 10 19 cm −3 . In terms of the optically detected magnetic resonance (ODMR) observation by Lee [6], the possible electronic structure of Ga i defects based on their lattice sites was considered as the double positive charge state, Ga i ++ . Three stable charge states in energy gap for Ga i , at least two defect energy levels, +/++ and ++/+++, could be considered for defect-defect interactions.…”

Section: Resultsmentioning

confidence: 99%

Determination of spin-orbit splitting Δ 0 of valence band at Γ for gallium phosphide nanoparticles using fluorescence and infrared spectroscopes

Zhang

2011

Rare Metals

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The value of spin-orbit splitting Δ 0 of gallium phosphide (GaP) nanoparticles was determined. The information concerning the spin-orbit splitting of the valence band at Γ was acquired using fluorescence and infrared spectroscopes. Detailed investigation on the fluorescence characteristics under ultraviolet photoexcitation reveals that two doublets of emission transitions are related to the spin-orbit splitting of the valence band. The origin of two broad violet emissions, 3.00 and 3.10 eV, can be attributed to the direct transitions near the Γ point of the Brillouin zone between the Γ 1 conduction band and Γ 15 valance band, that is, Γ 6c -Γ 8v and Γ 6c -Γ 7v , respectively. The origin of two blue emissions, 2.74 and 2.64 eV, can be attributed to the indirect transitions between the X 1 conduction band and Γ 15 valance band, that is, Δ 5c -Γ 8v and Δ 5c -Γ 7v , respectively. Based on these transitions, the spin-orbit splitting Δ 0 of the GaP nanoparticles is determined as 0.10 eV. The infrared spectrum of the GaP nanoparticles shows a band at 817 cm −1 which is assigned to the transition between the Γ 7v and Γ 8v valence band maxima. It follows therefore that the spin-orbit splitting Δ 0 is 0.10 eV.

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Section: Resultsmentioning

confidence: 99%

Determination of spin-orbit splitting Δ 0 of valence band at Γ for gallium phosphide nanoparticles using fluorescence and infrared spectroscopes

Zhang

2011

Rare Metals

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Reduction of Nitrogen on Gallium Phosphide Nanoparticles

Zhang¹,

Cui

2005

Chin. J. Chem.

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Under mild ambient conditions gallium phosphide (GaP) nanoparticles were employed to carry out the reduction of nitrogen. By using Nessler's reagent ammonia was detected in the slurry where the aggregated GaP particles were suspended in water and bubbled by pure nitrogen. Dependence of the concentration of ammonia upon bubbling time, velocity of the flow of nitrogen, and dosage of GaP particles was investigated. In comparison with the original GaP nanoparticles, the Raman scattering of the GaP particles undergoing the process of nitrogen fixation reveals that two sharp lines at 138 and 182 cm -1 , respectively, emerged from the broad continuum around 100-200 cm -1 . These two lines might be assigned to the translational motions of ammonia adsorbed on the surface of the GaP particles. An assessment of the infrared spectra of the two GaP particles led to the conclusion that the environment of the two H 2 O molecules was not identical. Analysis of the electron spin resonance results showed that the structure defect, gallium self-interstitial, was not involved in the nitrogen fixation of the GaP nanoparticles.

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