The application of thick film techniques to the production of the dye sensitised solar cell

Abstract

The dye sensitised or Gratzel solar cell ( DSSC ) offers a photovoltaic technology which can be mass produced at relatively low cost using conventional thick film techniques for the production of the electrodes. The photoelectrode comprises of a mesoporous titanium dioxide layer with the counter electrode containing a catalyst layer for the reduction of triiodide to iodine. The TiC>2 layer is dyed with a ruthenium polypyridyl complex to sensitise the electrode to the incoming solar radiation. The two electrodes are sealed with a gasket encapsulating an organic liquid comprising the triiodide / iodide redox electrolyte. The repeated, controlled deposition of electrodes on 50 mm square substrates has been demonstrated using screen printing equipment capable of printing much larger areas. Different TiC>2 pastes were evaluated for thick film deposition and film quality. The capability for printing complicated Ti(>2 film patterns has also been demonstrated. The same techniques were also used for the preparation of the platinum counter electrode to achieve high open circuit potentials for the cell.

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