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Unsymmetrical Squaraines Incorporating Cabazole as a Donor for Dye-Sensitized Solar Cells.
- Source :
- Journal of the Chinese Chemical Society; Oct2012, Vol. 59 Issue 10, p1337-1344, 8p
- Publication Year :
- 2012
-
Abstract
- Three unsymmetrical squaraines, where the electron-rich thiophene or bithiophene conjugated fragment was used to link unconventionally the squaraine core and carbazole (or methyl) group, were prepared. JYL-SQ1 with thiophene as a donor and indoline-carboxylic acid as an acceptor has λmax of 568 nm which is much longer than the general metal-free organic dyes. Adding a carbazole unit in JYL-SQ1 (forms JYL-SQ2) can red-shift the λmax to 603 nm. However, cabazole is not a strong donor (and indoline-carboxylic acid is a weak acceptor) the LUMO of all three dyes are delocalized majorly on squaraine unit: the excited electrons of dye molecules injecting into TiO<subscript>2</subscript> are not so efficiency, resulting in low short-circuit current and conversion efficiency. The corresponding DSSC devices have the conversion efficiency of 0.71%, 2.59% and 2.22% for JYL-SQ1, JYL-SQ2 and THL-SQ3, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00094536
- Volume :
- 59
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the Chinese Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 82070109
- Full Text :
- https://doi.org/10.1002/jccs.201200250