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• W3200501166 abstract "Three novel diketopyrrolopyrrole-based metal-free organic dyes ( TPh , BPh and SPh ) with different π-bridge lengths were designed and synthesized for dye-sensitized solar cells (DSSCs). The phenyl units were employed as the additional π-bridge for the three dyes, which located between the diketopyrrolopyrrole core and cyanoacrylic acid unit. Interestingly, it is the first time to report a diketopyrrolopyrrole-based dye with only one additional π-bridge unit ( SPh ). The effects of π-bridge length on photophysical, molecular planarity, energy level and photovoltaic properties of the dyes were systematically investigated. The results revealed that the prolongation of π-bridge length by introducing an additional phenyl unit results in an extra torsion in the structural framework and reduces the molecule planarity, which has a negative impact on improving the light-harvesting ability, while it is beneficial in lowering the tendency of aggregation and enhancing the excited electron injection efficiency. Finally, with a moderate π-bridge length ( BPh ), the best balance of overall performances is achieved, resulting in the highest power conversion efficiency (6.57%) without chenodeoxycholic acid. • Novel DPP-based organic dyes with phenyl unit were synthesized. • The effect of π-bridge length on the properties of the DPP dyes was investigated. • A DPP-based dye with only one additional π-bridge unit is reported for the first time. • A maximum efficiency of 6.57% is achieved for the dye with a moderate π-bridge length." @default.
• W3200501166 created "2021-09-27" @default.
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• W3200501166 date "2021-11-01" @default.
• W3200501166 modified "2023-09-26" @default.
• W3200501166 title "The role of the π-bridge length in the performance of diketopyrrolopyrrole-based organic dyes for dye-sensitized solar cells" @default.
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• W3200501166 doi "https://doi.org/10.1016/j.synthmet.2021.116916" @default.
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