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- W74635530 abstract "Using photothermal spectroscopy, spatially-resolved imaging of LEC undoped GaAs wafers has been performed. The observation of subsurface and surface inhomogeneities a few microns in dimensions is reported. Upon heating the wafers to 250/sup 0/C in a nitrogen atmosphere these inhomogeneities disappear. Concluded from analysis of the photothermal signal is that the inhomogeneities are arsenic-rich inclusions. This conclusion is verified by scanned Auger spectroscopy. Photothermal spectroscopy has also been used to investigate gap-state absorption (0.5 to 1.5 eV) of undoped, Cr-, and Si-doped crystals and to study the effect of plastic deformation on the absorption spectrum. In addition to reproducing the known absorption features, in some of the samples a peak at 0.5 to 0.6 eV has been observed which is tentatively attributed to Fe impurities." @default.
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- W74635530 date "1984-04-01" @default.
- W74635530 modified "2023-09-27" @default.
- W74635530 title "PHOTOTHERMAL SPECTRDSCOPY AND IMAGING OF GaAs" @default.
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