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core-level peak shift in (a), (b) for different , where thick and thin curves denote the spectra of and for (a) and and for (b). Solid and broken curves indicate the spectra taken before and under the UV illumination, respectively.
Schematic diagram of the elimination of band bending under the UV illumination. The electron-hole pairs created by the optical excitation are separated by the electric field of the depletion region.
(a) Spectral broadening before UV illumination for various . (b) Value of (open symbols) and (solid symbols) for various .
Calculated depth of depletion layer for various .
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