Solid-state dye-sensitized solar cells perform in a strictly different manner when tested under monochromatic as opposed to white-light illumination. Without a UV component in the illumination source, a Schottky barrier is present at the anode interface. Data suggest (see figure) that the generation of surface states, under white-light illumination, results in a pinning of the Fermi level in the TiO2 at the anode interface. Improving this contact facilitates significant improvement in the device performance.
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