Influence of Co-Adsorption, Co-Sensitization and Dye Extraction on Cells Performance in Natural Dye Sensitized Solar Cells
Alberto Fattori a, Maria Claudia Piangerelli a, Anna Alessia Viggiano a, Maria Francesca Ottaviani a
a Urbino Unibersity, Dept. Applied & Pure Science (DiSPeA), Urbino University, via Cà le Suore 2, 61129 Urbino
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Alberto Fattori, 233
Publication date: 11th February 2019

In a dye sensitized solar cell (DSC) sensitized with natural dyes, is required the identification of the right molecules that can be used as pigment and that must have the specific electronic characteristics as the standard synthetized dyes. [1]  In this study, a series of dyes never employed before in DSSC, were extracted from plants containing mainly anthocyanins compounds. The influence of extraction solvents, the use of co-adsorbents, [2] was investigated in order to monitor the effect of these changes on the cell performance. Influence of the co-sensitization was also explored.  For the extractions, the solvent and the dye bath pH were the modified parameters; citric acid and deoxycholic acid were used as co-adsorbent. The study shows that the best results are obtained when the flavilium cation is stabilized at pH between 1.5 and 2.5. The use of co-adsorbents improves both the open circuit voltage (Voc) and mainly the short circuit current (Isc). Binary solutions were employed as dye bath for the co-sensitization that showed an improvement on the cell stability

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