期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 48, 页码 32797-32804出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09671
关键词
blue color; organic dyes; co-sensitization; cobalt electrolyte; dye-sensitized solar cells
资金
- Swedish Energy Agency
- Swedish Research Council (VR)
- STandUP for Energy program
- Knut and Alice Wallenberg Foundation
- Stiftelsen Olle Engkvist Byggmatare
- Swiss National Science Foundation [200021_157135/1]
- Swiss National Science Foundation (SNF) [200021_157135] Funding Source: Swiss National Science Foundation (SNF)
Blue and green dyes as well as NIR-absorbing dyes have attracted great interest because of their excellent ability of absorbing the incident photons in the red and near-infrared range region. A novel blue D-pi-A dye (Dyenamo Blue), based on the diketopyrrolopyrrole (DPP)-core, has been designed and synthesized. Assembled with the cobalt bipyridine-based electrolytes, the device with Dyenamo Blue achieved a satisfying efficiency of 7.3% under one sun (AM1.5 G). The co-sensitization strategy was further applied on this blue organic dye together with a red D-pi-A dye (D35). The successful co-sensitization outperformed a panchromatic light absorption and improved the photocurrent density; this in addition to the open-circuit potential result in an efficiency of 8.7%. The extended absorption of the sensitization and the slower recombination reaction between the blue dye and TiO2 surface inhibited by the additional red sensitizer could be the two main reasons for the higher performance. In conclusion, from the results, the highly efficient cobalt-based DSSCs could be achieved with the co-sensitization between red and blue D-pi-A organic dyes with a proper design, which showed us the possibility of applying this strategy for future high-performance solar cells.
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