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Supramolecular Co-adsorption on TiO2to enhance the efficiency of dye-sensitized solar cells
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2021 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 9, no 23, p. 13697-13703Article in journal (Refereed) Published
Abstract [en]

Three novel push-pull dyes, with carbazole donors, codedAJ502,TZ101andTZ102are synthesized and applied as co-sensitizers in dye-sensitized solar cells (DSSCs).TZ101andTZ102have similar structures except for two fluorine atoms introduced on the benzotriazole (BTZ) unit.AJ502shows a near-IR absorption spectrum that is suitable for co-sensitization withTZ101andTZ102. The co-sensitized DSSC device based onCO-1(AJ502 : TZ101= 3 : 4 (0.075 mM : 0.1 mM)) achieves a power conversion efficiency (PCE) of 10.3% under AM 1.5G irradiation, with 1.06 V open-circuit voltage (Voc), 13.75 mA cm−2short-circuit photocurrent density (Jsc), and 70.8% fill factor (FF), a significant improvement compared to the single dye, 6.0% forAJ502and 5.1% forTZ101with a copper(i/ii)-based redox electrolyte. A PCE of 8.9% is also obtained by devices based onCO-2(AJ502 : TZ102= 3 : 4). ForCO-1, the fluorine atoms inTZ101play a critical role by widening the active light capturing bands of bothTZ101andAJ502on the TiO2film whileTZ102andAJ502show weaker interaction under the same conditions. The UV-vis spectrum and Raman spectrum revealed thatAJ502can form supramolecules withTZ101andTZ102formed on the TiO2film. 

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC) , 2021. Vol. 9, no 23, p. 13697-13703
Keywords [en]
Absorption spectroscopy, Conversion efficiency, Efficiency, Electrolytes, Fluorine, Open circuit voltage, Photocurrents, Carbazole donors, Co-sensitization, Light capturing, Near-IR absorption, Photocurrent density, Power conversion efficiencies, Redox electrolytes, UV-Vis spectrum, Dye-sensitized solar cells
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Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-309935DOI: 10.1039/d1ta00807bISI: 000658401400001Scopus ID: 2-s2.0-85107927660OAI: oai:DiVA.org:kth-309935DiVA, id: diva2:1645104
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QC 20220316

Available from: 2022-03-16 Created: 2022-03-16 Last updated: 2022-06-25Bibliographically approved

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Sun, Licheng

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