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Variation of with varying the for samples A, B, and C. The inset shows the curves of the samples A, B, and C annealed at .
curves for annealed samples A, B, and C. The inset shows the curves at 50 K for the same samples.
Raman spectra of undoped and As-doped samples annealed at . The inset lists the carrier type, carrier concentration, and carrier mobility for the same samples determined by Hall-effect measurements.
XPS spectra of (a) , (b) , (c) , and (d) core levels for samples A, B, and C annealed at .
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