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Indexed by:期刊论文

Date of Publication:2014-03-26

Journal:ACS applied materials & interfaces

Included Journals:Scopus、EI、PubMed

Volume:6

Issue:6

Page Number:3907-3914

ISSN No.:1944-8252

Abstract: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)nCOOH 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 (Jsc) was observed with increasing numbers of -CH2- units. For example, the device containing the organic dye bearing three -CH2- units produced the lowest Jsc of 7.94 mA·cm(-2). In contrast, the device containing the dye bearing only one -CH2- unit exhibited the highest Jsc 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%.