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Title: Light scattering enhancement from sub-micrometer cavities in the photoanode for dye-sensitized solar cells
Authors: Zakeeruddin, Shaik M.
Trang Pham, Thi Thu
Bessho, Takeru
Mathews, Nripan
Lam, Yeng Ming
Mhaisalkar, Subodh Gautam
Grätzel, Michael
Keywords: DRNTU::Engineering::Materials
Issue Date: 2012
Source: Trang Pham, T. T., Bessho, T., Mathews, N., Zakeeruddin, S. M., Lam, Y. M., Mhaisalkar, S., et al. (2012). Light scattering enhancement from sub-micrometer cavities in the photoanode for dye-sensitized solar cells. Journal of Materials Chemistry, 22(32), 16201-16204.
Series/Report no.: Journal of materials chemistry
Abstract: A simple cell architecture that achieves enhanced light harvesting with less dye quantity while simultaneously improving the power conversion efficiency (PCE) of dye-sensitized solar cells is presented. Polystyrene (PS) spheres of sub-micrometer size were incorporated into the titanium dioxide paste resulting in photoanodes with bimodal pore size distribution. Scanning electron micrographs of TiO2 films revealed a mixture of mesoporous and macroporous morphology in which sub-micrometer cavities created by the combustion of PS increased the light scattering, enhancing the optical path length and hence the harvesting of photons by the sensitizer. The amount of dye uptake by these films is lower than that of standard films because the high porosity reduces the total surface area. Even with lower dye adsorption, the photovoltaic performance has been maintained and even improved, mainly due to better open circuit voltage and higher fill factor. Overall, better light harvesting has helped to maintain the efficiency of dye-sensitized solar cells while saving up to 30% of dye loading and replacing the conventional 400 nm scattering layer with voids. By employing these photoanodes, an efficiency of 6.9% was achieved in ionic liquid based dye sensitized solar cells.
DOI: 10.1039/c2jm32401f
Rights: © 2012 The Royal Society of Chemistry.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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