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Molecular Engineering of D-D-pi-A-Based Organic Sensitizers for Enhanced Dye-Sensitized Solar Cell Performance
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Natl Res Ctr, Inorgan Chem Dept, Tahrir St, Giza 12622, Egypt.ORCID iD: 0000-0002-7952-1591
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-8084-1181
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-5115-4593
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-5069-3245
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2018 (English)In: ACS OMEGA, ISSN 2470-1343, Vol. 3, no 4, p. 3819-3829Article in journal (Refereed) Published
Abstract [en]

A series of molecularly engineered and novel dyes WS1, WS2, WS3, and WS4, based on the D35 donor, 1-(4-hexylphenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole and 4-(4-hexylphenyl)-4H-dithieno[3,2-b: 2', 3'-d] pyrrole as pi-conjugating linkers, were synthesized and compared to the well-known LEG4 dye. The performance of the dyes was investigated in combination with an electrolyte based on Co(II/III) complexes as redox shuttles. The electron recombination between the redox mediators in the electrolyte and the TiO2 interface decreases upon the introduction of 4-hexylybenzene entities on the 2,5-di(thiophen-2-yl)-1H-pyrrole and 4H-dithieno[3,2-b: 2', 3'-d] pyrrole linker units, probably because of steric hindrance. The open circuit photovoltage of WS1-, WS2-, WS3-, and WS4-based devices in combination with the Co(II/III)-based electrolyte are consistently higher than those based on a I-/I-3(-) electrolyte by 105, 147, 167, and 75 mV, respectively. The WS3-based devices show the highest power conversion efficiency of 7.4% at AM 1.5 G 100 mW/cm(2) illumination mainly attributable to the high open-circuit voltage (V-OC).

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 3, no 4, p. 3819-3829
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Materials Chemistry
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URN: urn:nbn:se:kth:diva-227229DOI: 10.1021/acsomega.8b00271ISI: 000430200300022Scopus ID: 2-s2.0-85045042845OAI: oai:DiVA.org:kth-227229DiVA, id: diva2:1205528
Note

QC 20150514

Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2019-10-08Bibliographically approved

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Cong, JiayanGao, JiajiaLiu, PengQuentin, DanielKloo, Lars

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