Supercritical carbon dioxide as a solvent for deposition of a tailored dye in dye sensitized solar cells
2011
Maniam, Subashani | Holmes, A. B. (Andrew B.) | Krstina, Julia | Leeke, Gary A. | Collis, Gavin E.
We report a new technique whereby dyes can be deposited onto metal oxide surfaces using supercritical carbon dioxide (scCO₂) for use in solar cell applications. This process eliminates the need for hazardous organic solvents and waste solvents generated during the dyeing process. The solubility of a perylene anhydride dye in scCO₂ is enhanced by the incorporation of fluorinated alkyl subsituents and the use of masked carboxylic binding groups. This allows fast deposition of the dye onto the TiO₂ photoanode, resulting in efficient photovoltaic performance. The unreacted dye is then easily recovered in a solid form after the deposition process by venting the carbon dioxide.
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