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Novel Blue Organic Dye for Dye-Sensitized Solar Cells Achieving High Efficiency in Cobalt-Based Electrolytes and by Co-Sensitization
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-8084-1181
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2016 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 8, no 48, p. 32797-32804Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 8, no 48, p. 32797-32804
Keywords [en]
blue color, organic dyes, co-sensitization, cobalt electrolyte, dye-sensitized solar cells
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-199484DOI: 10.1021/acsami.6b09671ISI: 000389624600020Scopus ID: 2-s2.0-85002658339OAI: oai:DiVA.org:kth-199484DiVA, id: diva2:1067222
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QC 20170120

Available from: 2017-01-20 Created: 2017-01-09 Last updated: 2017-11-29Bibliographically approved

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Cong, Jiayan

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