Figure 5.

Schematic of the depletion region in the dark (A) and under UV illumination (B). Photogenerated holes accumulate at the nanowire surface, partly neutralizing negatively charged absorbed oxygen species, which reduces the surface potential, leading to a reduction of the depletion width and increased photocurrent.

Bao et al. Nanoscale Research Letters 2011 6:404   doi:10.1186/1556-276X-6-404
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