In this study, nanocrystalline Nb2O5 thin film has been prepared via sol–gel process using niobium ethoxide as a precursor. Sol–gel films using various ratios of H2O/Nb have been prepared on fluorinated tin oxide (FTO) glass substrate, and
used as electron-blocking layer of dye-sensitized solar cell (DSSC). The Nb2O5 film as deposited was amorphous, but became crystalline with hexagonal phase after heat treatment at 600 °C. With higher H2O/Nb molar ratio, denser and more uniform Nb2O5
film surface was obtained. DSSCs with the structure of FTO/Nb2O5/TiO2/Dye/EL/Pt/FTO have been prepared, and their solar-cell performance was evaluated. By introduction of Nb2O5 sol–gel film between FTO and TiO2 layer in
DSSCs, energy conversion efficiency could be improved.
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