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• W1992592927 abstract "The construction of branched coumarin dyes based on a 2D-π-A system is focused to optimize the light-harvesting capability and enhance the photovoltaic performance. Three novel coumarin dyes, coded as MS-C, MS-F, and MS-M, respectively, were obtained by incorporating different units (carbazole, fluorene and methyl groups) with different molecular volume and degrees of electron-donating capability into the π-conjugation linker. Through molecular engineering, their light-harvesting capabilities, energy levels and photovoltaic performance were studied systematically. As expected, with the additional donor, especially utilizing strong electron-donating carbazole unit, the IPCE action spectrum of MS-C keeps a high plateau from 390 nm to 580 nm with nearly unity values. Along with the improvement of IPCE, the Jsc values of the three dyes were increased by 77% from 7.61 (MS-M) to 13.47 mA cm−2 (MS-C). Using DCA as the co-adsorbed material, the Jsc of MS-M was increased while these values were decreased in the cases of branched MS-C and MS-F. This means that the twist structure arising from the branched donors could prevent π-aggregation effectively. More importantly, the Voc was also improved significantly by introducing the additional donor. While the branched 2D-π-A system was constructed, the Voc was sharply increased from 508 (MS-M) to 610 mV (MS-C). Comprehensively, a more than 100% enhancement in overall conversion efficiency (5.53%) was realized by branched MS-C compared to the linear MS-M (2.74%). Although the overall conversion efficiencies of these dyes are not very high, these results will still afford significant value for future development of efficient coumarin sensitizers with high open-circuit voltage." @default.
• W1992592927 created "2016-06-24" @default.
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• W1992592927 date "2012-01-01" @default.
• W1992592927 modified "2023-09-26" @default.
• W1992592927 title "Novel branched coumarin dyes for dye-sensitized solar cells: significant improvement in photovoltaic performance by simple structure modification" @default.
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• W1992592927 doi "https://doi.org/10.1039/c2jm32333h" @default.
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