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High performance solid-state dye-sensitized solar cells based on organic blue-colored dyes
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-5069-3245
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2017 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 5, no 3, p. 1242-1247Article in journal (Refereed) Published
Abstract [en]

The development of novel photosensitizers with very high molar extinction coefficients and broad absorption spectra to enhance the light harvesting efficiency providing high PCEs for solid state dye sensitized solar cells (sDSCs) is a main target for improvement. In this work, two novel organic blue-colored dyes termed S4 and S5 with indeno[1,2-b]thiophene functionalized triphenylamine as the donor, 2,3-diphenylpyrido[3,4-b]pyrazine (PP) or 2,3-diphenylquinoxaline (QT) as the auxiliary acceptor and cyclopentadithiophene (CPDT) as the π-linker were designed and synthesized for sDSCs. S5 containing the QT unit as the electron-withdrawing group exhibits a high molar extinction coefficient of 6.3 × 104 M-1 cm-1 at 600 nm. Most importantly, the S5-based sDSCs shows record PCEs of 7.81% and 8.25% under one sun and 0.5 sun light intensities, respectively, exceeding the PCE of LEG4-based solar cells (7.34%). To the best of our knowledge, this is the first case where an organic blue-colored dye displays a PCE over 7.8% in sDSCs, thus representing record efficiencies for sDSCs. These results clearly show that molecular engineering is a viable way to develop blue-colored dyes with high molar extinction coefficients for use in highly efficient sDSCs. Also, blue-colored dyes open up co-sensitization strategies in combination with traditional organic dyes with yellow-red colours.

Place, publisher, year, edition, pages
RSC Publishing, 2017. Vol. 5, no 3, p. 1242-1247
Keywords [en]
Dyes, Efficiency, Photosensitizers, Solar cells, Co-sensitization, Electron withdrawing group, Light-harvesting, Molar extinction coefficient, Molecular engineering, Record efficiencies, Solid-state dye-sensitized solar cells, Triphenyl amines, Dye-sensitized solar cells
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-201767DOI: 10.1039/c6ta09723eISI: 000394430800045Scopus ID: 2-s2.0-85010303433OAI: oai:DiVA.org:kth-201767DiVA, id: diva2:1075786
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

Funding text: For financial support of this research, we thank the NSFC/China (21421004, 21372082, 21572062, and 91233207), the National Basic Research 973 Program (2013CB733700) and the Programme of Introducing Talents of Discipline to Universities (B16017). This work was also financially supported by the Swedish Research Council, the Swedish Energy Agency, and the Knut and Alice Wallenberg Foundation.

QC 20170221

Available from: 2017-02-21 Created: 2017-02-21 Last updated: 2017-11-29Bibliographically approved

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