Improvement performance of dye sensitised solar cells from co-sensitisation of TiO₂ electrode with organic dyes based on indigo and thioindigo

Abstract

This paper described a double layered co-sensitisation as new approach for achieving improved performance in dye sensitised solar cells. Therefore, dye sensitised solar cells were prepared by using two metal free substituted organic dyes based on indigo and thioindigo. Spectrophotometric evaluations of the mixture dyes in solution and on a nano anatase TiO₂ substrate were carried out in order to assess possible changes in the status of the dyes in different environments. Oxidation potential measurements for mixture dyes ensured an energetically permissible and thermodynamically favourable charge transfer throughout the continuous cycle of photoelectric conversion. Anti-aggregation agent is usually utilised in fabrication of dye sensitised solar cells, so the effect of Cheno as anti-aggregation agent on TiO₂ nanostructure solar cells dyes was investigated. Finally, dye sensitised solar cells were fabricated with two different organic dyes as photosensitiser in order to determine the photovoltaic behavior and conversion efficiencies of each condition.

Keywords:

• Co-sensitisation
• Dye sensitised solar cells
• Organic dye
• Conversion efficiency
• Antiaggregation agent