Journal
NANO LETTERS
Volume 11, Issue 4, Pages 1452-1456Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl104034e
Keywords
Solid-state dye-sensitized solar cells; D-pi-A dye; electron injection; charge collection
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Funding
- National Key Scientific Program [2007CB936700]
- National Science Foundation of China [50973105]
- Chinese Academy of Sciences
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- King Abdullah University of Science and Technology (KAUST)
- Swiss National Science Foundation
- European community [247404]
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The high molar absorption coefficient organic D-pi-A dye C220 exhibits more than 6% certified electric power conversion efficiency at AM 1.5G solar irradiation (100 mW cm(-2)) in a solid-state dye sensitized solar cell using 2,2',7,7'-tetrakis(N,N-dimethoxyphenylamine)-9,9'-spirobi-fluorene (Spiro-MeOTAD) as the organic hole transporting material. This contributes to a new record (6.08% by NREL) for this type of sensitized heterojunction photovoltaic device. Efficient charge generation is proved by incident photon-to-current conversion efficiency spectra. Transient photovoltage and photocurrent decay measurements showed that the enhanced performance achieved with C220 partially stems from the high charge collection efficiency over a wide potential range.
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