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▲ [8a-A202-5] Improvement of Power Conversion Efficiency of Dye Sensitized Solar Cells by Depositing Light Scattering Layers of TiO2 by Electrophoresis
キーワード：DSSC, Scattering layer, PCE
Over the past 26 years, the power conversion efficiency (PCE) of dye sensitized solar cells (DSSCs) has reached a maximum of 13%. It has attracted great interest as a low cost and environmental friendly solar cell. However, compared with silicon solar cell, DSSCs has a problem of low PCE. In order to improve PCE, DSSCs were fabricated using thin films of titanium dioxide nanoparticles deposited by electrophoresis as both a semiconductor layer and a light scattering layer to increase a light harvesting efficiency (LHE). The LHE is defined as [1 – (transmittance + reflectance)], where the transmittance and reflectance are the ratios of the intensities of the transmitted light through the film and the reflected light at the incident plane of the film to the intensity of the incident light, respectively. Composite semiconductor layer (CSL) was fabricated using colloid mixtures of two types of titanium dioxide (TiO2) nanoparticles with different sizes, which are ≈5 nm diameter (TNP) and ≈20nm diameter (P25). Light scattering layer (LSL) was fabricated using colloid of TiO2 with different size (≈100 nm) and surface property, by which dye molecules were not adsorbed onto the surface. It is expected that the specific surface area and LHE become large and as a result, PCE can be improved.