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Effect of Different Numbers of -CH2- Units on the Performance of Isoquinolinium Dyes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, Vol. 6, no 6, 3907-3914 p.Article in journal (Refereed) Published
Abstract [en]

Three new dyes have been synthesized to investigate the influence of the distance between the electron acceptor and TiO2 surface on the performance of dye-sensitized solar cells (DSSCs). In these dyes, the isoquinolinium acceptor, with a -(CH2)(n) COOH anchoring group, and a functionalized triphenylamine donor are separated by an oligothiophene bridge. The physical and electrochemical properties of the dyes were investigated systematically. The results prove that different numbers of -CH2- units between the isoquinolinium acceptor and the carboxyl anchoring group have a less pronounced effect on the physical and electrochemical properties of these dyes. However, when applied in DSSCs, a sharp decrease in the short-circuit current (J(SC)) was observed with increasing numbers of -CH2- units. For example, the device containing the organic dye bearing three -CH2- units produced the lowest J(SC) of 7.94 mA.cm(-2). In contrast, the device containing the dye bearing only one -CH2- unit exhibited the highest J(SC) of 13.88 mA.cm(-2). The higher photocurrent obtained with the device incorporating the dye with one -CH2- unit resulted in a higher power conversion efficiency of 6.8%.

Place, publisher, year, edition, pages
2014. Vol. 6, no 6, 3907-3914 p.
Keyword [en]
dye-sensitized solar cells, energy conversion, anchoring group, cationic dyes, isoquinolinium dye, transient absorption
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-224363DOI: 10.1021/am405014fISI: 000333551500021OAI: oai:DiVA.org:uu-224363DiVA: diva2:716460
Available from: 2014-05-09 Created: 2014-05-09 Last updated: 2014-05-09Bibliographically approved

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Hao, Yan
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