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

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Current–voltage curves measured on (a) the Au/Si diode and (b) the tandem-structured TiO₂/Au/Si diode, showing an enhanced light response under illumination by a halogen–tungsten lamp (9 mW/cm²). The current–voltage curves without light illumination reveal that the rectifying behaviors of the diodes were well maintained. (c) Plot of a short-circuit photocurrent measured on the Au/Si diode and the tandem-structured TiO₂/Au/Si diode. (d) Energy band diagram for the effect of double Schottky barriers leading to multiple reflections of hot electrons, resulting in enhanced internal photoemission.