Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 17, Pages 5430-5437Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201200012
Keywords
dye-sensitized solar cells; electron transfer; metal-free sensitizers; quantum chemistry; quinoids
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Funding
- Academia Sinica (AC)
- NSC (Taiwan)
- AUO Optronics Corp.
- Instrumental Center of Institute of Chemistry (AC)
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New dipolar sensitizers containing an ethyl thieno[3,4-b]thiophene-2-carboxylate (ETTC) entity in the conjugated spacer have been synthesized in two isomeric forms. These compounds were used as the sensitizers of n-type dye-sensitized solar cells (DSSCs). The best conversion efficiency (5.31?%) reaches approximately 70?% of the N719-based (7.41?%) DSSC fabricated and measured under similar conditions. The ETTC-containing compounds exhibit a bathochromic shift of the absorption compared to their thiophene congeners due to the quinoid effect, however, charge-trapping at the ester group of ETTC was found to jeopardize the electron injection and lower the cell efficiency. Charge trapping is alleviated as the ester group of ETTC is replaced with a hydrogen atom, as evidenced from the theoretical computation.
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