Fabrication and investigation of blocking layer in dye-sensitized solar cells

Dense TiO2 films were prepared on conducting glass substrates by electron beam evaporation,and annealed in O2 atmosphere at different temperatures.In order to prevent the charge recombination at the interface of conducting glass substrate/electrolyte(I-3),the film was used as a blocking layer in dye-sensitized solar cell.The structure and composition were characterized by XRD and XPS,respectively.The influence of different thickness blocking layers on the photovoltaic properties of DSSC was investigated.The results reveal that the introduction of blocking layer effectively prevents the charge-transfer reaction and enhances the open voltage,short current,FF and photoelectric conversion efficiency.The photoelectric conversion efficiency is higher than that of without blocking layer by 31.5%.