Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 49, Pages 19770-19776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp808275z
Keywords
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Funding
- National Key Scientific Program [2007CB936700]
- National Science Foundation of China [50773078]
- Chinese Academy of Sciences
- U.S. Air Force project [FA 8655-08-C-4003]
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A series of organic D-pi-A sensitizers composed of different triarylamine donors in conjugation with the thienothiophene unit and cyanoacrylic acid as an acceptor has been synthesized at a moderate yield. Through tuning the number of methoxy substituents on the triphenylamine donor, we have gradually red-shifted the absorption of sensitizers to enhance device efficiencies. Further molecular engineering by the substitution of two hexyloxy chains in place of the methoxy groups allows fabricating a solvent-free dye-sensitized solar cell with a power conversion efficiency of 7.05% measured under the air mass 1.5 global sunlight. Time- and frequency-domain photoelectrical techniques have been employed to scrutinize the aliphatic chain effects with a close inspection on effective electron lifetime, diffusion coefficient, and diffusion length.
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