Donor–acceptor dyes with fluorine substituted phenylene spacer for dye-sensitized solar cells

A new series of organic sensitizers LJB-H, LJB-Fo and LJB-Fm with triphenylamine, 3,4-ethylenedioxythiophene plus various functionalized phenylenes, and cyanoacrylic acid as the donor, [small pi]-spacer, and anchoring group, respectively. These organic sensitizers exhibit much higher molar extinctio...

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Bibliographic Details
Published in:Journal of materials chemistry 2011-01, Vol.21 (6), p.1937-1945
Main Authors: Chen, Bo-So, Chen, Dong-Yi, Chen, Chao-Ling, Hsu, Che-Wei, Hsu, Hui-Chu, Wu, Kuan-Lin, Liu, Shih-Hung, Chou, Pi-Tai, Chi, Yun
Format: Article
Language:English
Subjects:
Affinity
Dyes
Electrodes
Energy gap
Fluorine
Parents
Spacers
Titanium dioxide
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Summary:A new series of organic sensitizers LJB-H, LJB-Fo and LJB-Fm with triphenylamine, 3,4-ethylenedioxythiophene plus various functionalized phenylenes, and cyanoacrylic acid as the donor, [small pi]-spacer, and anchoring group, respectively. These organic sensitizers exhibit much higher molar extinction coefficients than the parent LJ1 dye as well as reveal a remarkable fluorine substituent effect. LJB-Fm with fluoro substitution at the meta position relative to cyanoacrylic acid possesses a lower S0-S1 gap and weaker coupling with the TiO2 electrode (cf.LJB-H and LJB-Fo). Conversely, due to the resonance effect with respect to cyanoacrylic acid, the ortho-F-substituted LJB-Fo has a larger energy gap but stronger TiO2 affinity. As a result, LJB-Fo shows better DSSC performance with Jsc = 15.58 mA cm-2, Voc = 787 mV, FF = 0.67 and [small eta] = 8.22%.
ISSN:0959-9428
1364-5501
DOI:10.1039/C0JM02433C