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Improved efficiency of betanin-based dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
27541 44029 2011 8 PDF Available
Title
Improved efficiency of betanin-based dye-sensitized solar cells
Abstract

An improved separation technique employing medium pressure liquid chromatography is used to purify betanin from beet root for use as a sensitizer in a TiO2-based dye-sensitized solar cell. The use of a blocking layer and treatment by TiCl4 were explored in order to optimize the performance of the solar cell, resulting in energy conversion efficiencies as high as 2.7%, the highest yet recorded for a DSSC containing a single unmodified natural dye sensitizer. The fluorescence spectrum of betanin in aqueous solution is reported as a function of added colloidal TiO2, demonstrating efficient electron injection. Quenching of betanin fluorescence by TiO2 permits the observation of its resonance Raman spectrum, reported here for the first time and discussed in light of recent theoretical work on the electronic structure of betanin. We report the results of stability tests under continuous illumination and suggest ways to extend the lifetime of these solar cells.

► Betanin and indicaxanthin are extracted from beet root and separated using medium-pressure chromatography. ► A betanin-based dye-sensitized solar cell shows the highest energy conversion efficiency (2.7%) reported to date for an unmodified natural-dye sensitized solar cell. ► The resonance Raman spectrum of betanin is reported for the first time using colloidal TiO2 to quench its fluorescence, revealing efficient electron injection.

Keywords
Natural dye sensitizer; Dye-sensitized Solar cell; Betalains; Betanin
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Improved efficiency of betanin-based dye-sensitized solar cells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 221, Issue 1, 10 June 2011, Pages 90–97
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us