Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Dye-sensitized solar cells (DSSCs) have received considerable attention in the last decade because of their good efficiency coupled with low cost of production. To increase the performances of such devices it is important to develop effective organic photosensitizers with optimal chemical structures. The donor-π bridge-acceptor (D-π-A) configuration is mainstream in the design of organic sensitizers dye to convenient modulation of the intramolecular charge-transfer nature. In this work, a series of organic dyes (PR6A2, PBSCN2 and PRSCN2) involving phenothiazine were synthesized as sensitizers for application in dye-sensitized solar cells. Tuning of the optical and electrocheical properties is observed by the insertion of a phenyl ring on the phenothiazine unit. The insertion of an additional phenyl ring shows significant influence on the solar cell’s performance leading to high efficiency (η=8.26%) in DSSCs comparared to the sensitizer without phenyl unit (η=5.7%). Photophysical investigations reveal that the insertion of the phenyl ring prevent electron recombination between TiO2 electrode and electrolyte, thus slowing down recombination processes, while maintaing efficient electron injection from the excited dye into the TiO2 electrode.
Figure. (a) I-V curves of DSSC containing organic photosensitizers (b) Differences in the frontier molecular orbitals of organic dyes
Stefan, H.; Magdalena, M.; Amaresh. M.; Mateusz. W.; Joel. T.; Jacques-E. M.; Michael.G.; Peter. B. Significant Improvement of Dye-Sensitized Solar Cell Performance by Sall Structural Modigication in ¥ð-Conjugated Donor-Acceptor Dyes. Adv.Funct Mater. 2012, 22, 1291-1302.
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