| Molecular engineering of organic sensitizers for solar cell applications. | |
| | |
MedLine Citation:
|
PMID: 17177420 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Novel organic sensitizers comprising donor, electron-conducting, and anchoring groups were engineered at molecular level and synthesized. The functionalized unsymmetrical organic sensitizers 3-{5-[N,N-bis(9,9-dimethylfluorene-2-yl)phenyl]-thiophene-2-yl}-2-cyano-acrylic acid (JK-1) and 3-{5'-[N,N-bis(9,9-dimethylfluorene-2-yl)phenyl]-2,2'-bisthiophene-5-yl}-2-cyano-acrylic acid (JK-2), upon anchoring onto TiO2 film, exhibit unprecedented incident photon to current conversion efficiency of 91%. The photovoltaic data using an electrolyte having composition of 0.6 M M-methyl-N-butyl imidiazolium iodide, 0.04 M iodine, 0.025 M LiI, 0.05 M guanidinium thiocyanate, and 0.28 M tert-butylpyridine in a 15/85 (v/v) mixture of valeronitrile and acetonitrile revealed a short circuit photocurrent density of 14.0 +/- 0.2 mA/cm2, an open circuit voltage of 753 +/- 10 mV, and a fill factor of 0.76 +/- 0.02, corresponding to an overall conversion efficiency of 8.01% under standard AM 1.5 sunlight. DFT/TDDFT calculations have been performed on the two organic sensitizers to gain insight into their structural, electronic, and optical properties. Our results show that the cyanoacrylic acid groups are essentially coplanar with respect to the thiophene units, reflecting the strong conjugation across the thiophene-cyanoacrylic groups. Molecular orbitals analysis confirmed the experimental assignment of redox potentials, while TDDFT calculations allowed assignment of the visible absorption bands. |
| | |
Authors:
|
Sanghoon Kim; Jae Kwan Lee; Sang Ook Kang; Jaejung Ko; J-H Yum; Simona Fantacci; Filippo De Angelis; D Di Censo; Md K Nazeeruddin; Michael Grätzel |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of the American Chemical Society Volume: 128 ISSN: 0002-7863 ISO Abbreviation: J. Am. Chem. Soc. Publication Date: 2006 Dec |
Date Detail:
|
Created Date: 2006-12-20 Completed Date: 2007-02-20 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7503056 Medline TA: J Am Chem Soc Country: United States |
Other Details:
|
Languages: eng Pagination: 16701-7 Citation Subset: - |
Affiliation:
|
Department of Chemistry, Korea University, Jochiwon, Chungnam 339-700, Korea. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Dynamic processes in [16]annulene: Möbius bond-shifting routes to configuration change.
Next Document: Quinones as electron acceptors. X-ray structures, spectral (EPR, UV-vis) characteristics and electro...