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The Schottky barrier energy band diagram and the photoresponse mechanism: when light was on, the photo generated holes will recombine with the adsorbed oxygen on the nanobelt surface. The surface depletion layer thickness and the Schottky barrier EB were reduced. ECs and EVs were the conductance band and valance band of the CdS nanowire; Efm and ECm were the Fermi level and conductance band of the metal. EB was the Schottky barrier.
