Dye-sensitized solar cells based on TiO_2 nanoparticlesanobelts double-layered film with improved photovoltaic performance

摘要

Dye-sensitized solar cells (DSSCs) were fabricated using double layers of nano-structured TiO_2 films as photoanodes. Different anode architectures of double-layered TiO_2 films were fabricated in order to study the structural effect of photoanodes on the solar cell efficiency. The performances of DSSCs based on composite photoanodes in the forms of TiO_2 nanoparticlesanobelts (TiO_2 P-B), TiO_2 nanoparti-clesanoparticles (TiO_2 P-P). TiO_2 nanobeltsanobelts (TiO_2 B-B) double-layered electrodes with the same film thicknesses were studied in detail, and their corresponding efficiencies were 4.81%, 3.55% and 0.36%. The work shows that significant improvement of efficiency can be achieved through combined enhancement in optical scattering using the TiO_2 nanobelts and high dye absorbing capacity of the TiO_2 nanoparticles.