Research Article

Low-Temperature Rapid Fabrication of ZnO Nanowire UV Sensor Array by Laser-Induced Local Hydrothermal Growth

Figure 4

Schematics on the mechanism of ZnO NW based UV sensor. (a) In the dark, oxygen molecules are adsorbed on the surface of ZnO NW by capturing the free electrons in n-type semiconductor. (b) Upon the UV illumination, electron-hole pairs are generated, and the oxygen molecules are detached from the surface by taking the holes. The remaining electrons contribute to the increase in conductivity.
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(a)
246328.fig.004b
(b)