Effect of Different Numbers of -CH2- Units on the Performance of Isoquinolinium Dyes
2014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, Vol. 6, no 6, 3907-3914 p.Article in journal (Refereed) Published
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.
dye-sensitized solar cells, energy conversion, anchoring group, cationic dyes, isoquinolinium dye, transient absorption
IdentifiersURN: urn:nbn:se:kth:diva-144943DOI: 10.1021/am405014fISI: 000333551500021ScopusID: 2-s2.0-84896947073OAI: oai:DiVA.org:kth-144943DiVA: diva2:715491
FunderSwedish Energy AgencyKnut and Alice Wallenberg Foundation
QC 201405052014-05-052014-05-052014-05-05Bibliographically approved