Abstract
We report on the characteristics of a TiO 2 passivating layer grown by radio frequency (RF) magnetron sputtering on F-doped SnO 2 (FTO) electrodes as a function of its thickness. The optical transparency, surface roughness and passivation properties of the TiO 2 layer passivating the FTO electrode depend on the thickness of the TiO 2 passivating layer. In addition, it was found that the power conversion efficiency of the dye-sensitized solar cells (DSSCs) is critically dependent on the thickness of RF sputtered TiO 2 layer inserted between FTO electrode and nanoporous TiO 2 layer. The DSSC fabricated on 50 nm thick TiO 2 passivating FTO electrode showed the maximum power conversion efficiency of 4.42% due to effective prevention of the electron transfer to electrolyte. This indicates that the thickness optimization of the TiO 2 passivating layer is one of the important parameter to obtain high performance DSSCs.
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