displays the comparison of IPCE curves of the DSSCs madefrom the TiO2 P–B, TiO2 P–P and TiO2 B–B double-layered film electrodes, in which IPCE were normalized to a common value of 1 at their maximum (530 nm). As can be seen, the TiO2 P–B solar cell shows much higher IPCE values than that of the TiO2 P–P and TiO2 B–B solar cell, which is in good agreement with the aforementioned photocurrent–voltage results. In other words,the enhanced performance of the TiO2 P–B DSSC is related to itsrelatively high surface area for effective dye adsorption mainly originated from TiO2 nanoparticles underlayer and enhanced light-scattering capability due to TiO2(B) nanobelts overlayer.