Aggregation of ZnO Nanocrystallites for High Conversion Efficiency in Dye-Sensitized Solar Cells


  • This work was financially supported by National Science Foundation, US Department of Energy, Washington Technology Centre, and Air Force Office of Scientific Research.


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Here comes the sun: A conversion efficiency as high as 5.4 % has been achieved on dye-sensitized ZnO solar cells with photoelectrode films consisting of polydisperse aggregates, compared to 2.4 % for the films with only nanosized crystallites. The aggregation of nanocrystallites with a broad size distribution is effective in enhancing the light-harvesting efficiency by inducing light scattering within the photoelectrode films.