Abstract
Cyclic free-base porphyrin dimers linked by butadiyne or phenothiazine bearing four 4-pyridyl groups and their inclusion complexes with fullerene C60 have been applied to dye-sensitized solar cells as a new class of porphyrin dye sensitizers.
Highlights
Dye-sensitized solar cells (DSSCs) employing dye-adsorbed TiO2 electrodes are one of the most promising new renewable photovoltaic cells utilizing the sun as a free and inexhaustible energy source because of their interesting construction and operational principles, and low cost of production, since Gratzel and co-workers produced high-performance dye-sensitized solar cells (DSSCs) based on a Ru-complex dye, which showed a solar energy-to-electricity conversion yield (h) of 11%.1 To further improve the photovoltaic performance of DSSCs, many kinds of ruthenium (Ru) dyes, porphyrin dyes, phthalocyanine dyes and organic dyes bearing carboxyl groups as anchoring groups, which are adsorbed onOn the other hand, we have reported that a new type of D–p– A dye sensitizers bearing pyridyl group as electron-withdrawing anchoring group were predominantly adsorbed on the TiO2 electrode through coordinate bonding between the pyridyl16150 | RSC Adv., 2016, 6, 16150–16158Paper group of the dye and the Lewis acid site (exposed Tin+ cations) on the TiO2 surface.[16,17] It was demonstrated that the new-type of D–p–A dye sensitizers can inject electrons efficiently from the pyridyl group to the conduction band (CB) of the TiO2 electrode through the coordinate bonding, rather than the bidentate bridging linkages of conventional D–p–A dye sensitizers bearing carboxyl group
Wang et al reported that dye-sensitized solar cells (DSSCs) based on D–p–A porphyrin dye bearing a pyridyl group reached solar energy-to-electricity conversion yield (h) of 3.96%.18a On the other hand, Goutsolelos et al reported the h value of 3.9% for DSSC based on porphyrin dye bearing four pyridyl groups.18c the adsorption amounts (
The higher photovoltaic performance for DSSC based on H4-Ptz-CPDPy(TEO) may be attributed to the efficient electron injection from the photoexcited dye (1H4-Ptz-CPDPy(TEO)*) to the conduction band (CB) of TiO2 electrode because the phenothiazine unit possessing electron donating ability can provide a unidirectional ow of electrons toward the pyridyl anchoring group upon photoexcitation of the porphyrin
Summary
Dye-sensitized solar cells (DSSCs) employing dye-adsorbed TiO2 electrodes are one of the most promising new renewable photovoltaic cells utilizing the sun as a free and inexhaustible energy source because of their interesting construction and operational principles, and low cost of production, since Gratzel and co-workers produced high-performance DSSCs based on a Ru-complex dye, which showed a solar energy-to-electricity conversion yield (h) of 11%.1 To further improve the photovoltaic performance of DSSCs, many kinds of ruthenium (Ru) dyes, porphyrin dyes, phthalocyanine dyes and organic dyes bearing carboxyl groups as anchoring groups, which are adsorbed onOn the other hand, we have reported that a new type of D–p– A dye sensitizers bearing pyridyl group as electron-withdrawing anchoring group were predominantly adsorbed on the TiO2 electrode through coordinate bonding between the pyridyl16150 | RSC Adv., 2016, 6, 16150–16158Paper group of the dye and the Lewis acid site (exposed Tin+ cations) on the TiO2 surface.[16,17] It was demonstrated that the new-type of D–p–A dye sensitizers can inject electrons efficiently from the pyridyl group to the conduction band (CB) of the TiO2 electrode through the coordinate bonding, rather than the bidentate bridging linkages of conventional D–p–A dye sensitizers bearing carboxyl group. It is worth mentioning here that the adsorption amount of the porphyrin dimers adsorbed on TiO2 lm is 2.0 Â 1017 molecules per cm[2], that is, the adsorption amount of porphyrin unit is 4.0 Â 1017 cmÀ2, which is higher than those (
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
