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. 2014 Apr 3;4:4580. doi: 10.1038/srep04580

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(a) Plot of photocurrent density as a function of TiO₂ layer thickness under light illumination. Cross-sectional SEM images of (b) a 44 nm thick TiO₂ layer, (c) a 63 nm thick TiO₂ layer, and (d) a 81 nm thick TiO₂ layer.