An Organic D-π-A Dye for Record Efficiency Solid-State Sensitized Heterojunction Solar Cells

Ning Cai, Soo-Jin Moon, Lê Cevey-Ha, Thomas Moehl, Robin Humphry-Baker, Peng Wang, Shaik M. Zakeeruddin, Michael Grätzel

Research output: Contribution to journalArticlepeer-review

311 Scopus citations


The high molar absorption coefficient organic D-π-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′- spirobifluorene (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. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1452-1456
Number of pages5
JournalNano Letters
Issue number4
StatePublished - Apr 13 2011
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: N.C. and P.W. thank the National Key Scientific Program (No. 2007CB936700), the National Science Foundation of China (No. 50973105), and the Hundred Talent Program of Chinese Academy of Sciences for the financial support. This publication is partially based on work supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST). Financial support from the Swiss National Science Foundation is also gratefully acknowledged. M.G. thanks the ECR advanced grant agreement (No. 247404) under the CE-Mesolight project funded by the European community's 7th FWP. We are grateful to Mr. P. Comte for TiO2 nanoparticles preparations and Mr. Jean-David Decoppet and Dr. Paul Liska for helping in preparing and performing the NREL measurements.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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