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When the surface of the TiO<sup>2</sup> is exposed to the UV lights, negatively charged particles-electrons-are released, just as the same way as the electron released when sunlight hits the surface of the silicon solar power cells.
Simultaneously, positively charged holes are formed on the surface of the thin film at the mark that a electron released.
Photocatalytic chemical reactions occuring on the surface of semiconductor materials depend on the process, which starts from the absorption ...
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