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- W2078003764 abstract "High-frequency spark discharges were applied to single-crystalline wafers of Ge, GaAs, and Si. The spark-processed (sp-) samples were characterized by photoluminescence (PL) and Raman measurements. Strong and stable luminescence with wavelengths centered at 416 and 525 nm was observed in sp-Ge and sp-Si layers, respectively, when excited with a 325 nm laser beam. A considerable blue shift of the PL (compared to the unsparked specimen) was also detected for sp-GaAs with an average peak wavelength around 500 nm. The Raman shifts of the spark-processed materials indicate that nanocrystals were formed, having diameters of 3.5–4 nm for Si and about 6 nm for Ge. A correlation between the PL wavelengths, the nanocrystal sizes, and the different semiconductor materials has been established based on the effective-mass approximation. Making use of this model the nanocrystallite sizes have been found to range between ∼3 nm for Si and ∼5 nm for Ge. The related wavelengths for optical transitions confirm the PL results. The findings support the quantum confinement model." @default.
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- W2078003764 date "1994-09-01" @default.
- W2078003764 modified "2023-09-26" @default.
- W2078003764 title "Bright visible photoluminescence of spark-processed Ge, GaAs, and Si" @default.
- W2078003764 doi "https://doi.org/10.1116/1.587553" @default.
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