Abstract
The photoelectrochemical properties of the mercurochrome-sensitized SnO 2/TiO 2 coupled cell were studied with TiO 2 film thickness at a constant SnO 2 thickness. The optimal film thickness in the coupled cell is 3.5-μm-thick SnO 2 and 6–7-μm-thick TiO 2 and the maximum incident photon-to-current conversion efficiency (IPCE) value reached about 30.5% at 520 nm. The higher IPCE value in the 3.5 μm SnO 2/6–7 μm TiO 2 coupled cell is attributed to a better charge separation by fast electron transfer process from excited dye to TiO 2 to SnO 2.
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