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      Squaraine Dyes for Dye-Sensitized Solar Cells: Recent Advances and Future Challenges

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      Chemistry - An Asian Journal
      Wiley-Blackwell

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          Dye-sensitized solar cells.

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            Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency.

            The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8). The specific molecular design of YD2-o-C8 greatly retards the rate of interfacial back electron transfer from the conduction band of the nanocrystalline titanium dioxide film to the oxidized cobalt mediator, which enables attainment of strikingly high photovoltages approaching 1 volt. Because the YD2-o-C8 porphyrin harvests sunlight across the visible spectrum, large photocurrents are generated. Cosensitization of YD2-o-C8 with another organic dye further enhances the performance of the device, leading to a measured power conversion efficiency of 12.3% under simulated air mass 1.5 global sunlight.
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              Metal-free organic dyes for dye-sensitized solar cells: from structure: property relationships to design rules.

              Dye-sensitized solar cells (DSSC) have attracted considerable attention in recent years as they offer the possibility of low-cost conversion of photovoltaic energy. This Review focuses on recent advances in molecular design and technological aspects of metal-free organic dyes for applications in dye-sensitized solar cells. Special attention has been paid to the design principles of these dyes and on the effect of various electrolyte systems. Cosensitization, an emerging technique to extend the absorption range, is also discussed as a way to improve the performance of the device. In addition, we report on inverted dyes for photocathodes, which constitutes a relatively new approach for the production of tandem cells. Special consideration has been paid to the correlation between the molecular structure and physical properties to their performance in DSSCs.
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                Author and article information

                Journal
                Chemistry - An Asian Journal
                Chem. Asian J.
                Wiley-Blackwell
                18614728
                August 2013
                August 17 2013
                : 8
                : 8
                : 1706-1719
                Article
                10.1002/asia.201300185
                3c157b9b-c8d9-4a38-8095-953f54a7b042
                © 2013

                http://doi.wiley.com/10.1002/tdm_license_1.1

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