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Proceedings Paper

Development of new efficient Ru dyes having β-diketonate and terpyridine ligands for solar cells
Author(s): Takeshi Yamaguchi; Naoyuki Shibayama; Makoto Nakade; Yoshimoto Abe; Hironori Arakawa
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Paper Abstract

We have synthesized a new series of Ru complexes having β-diketonate and terpyridine ((tctpy = 4,4',4''- tricarboxy-2,2':6',2''-terpyridine) ligands as efficient panchromatic photosensitizers. Then we fabricated dye-sensitized solar cells (DSCs) using these Ru dyes. It was observed that newly synthesized Ru dye, Ru(tctpy)(dfac)NCS (3) (dfac = 1,1-difluoroacetylacetone), as well as previously synthesized Ru dyes, Ru(tctpy)(acac)NCS (1)(acac = acetylacetone) and Ru(tctpy)(tfac)NCS (2) (tfac = 1,1,1,-trifluoroacetylacetone) could absorb light wider than that of Ru(tctpy)(NCS)3 (Black dye), which was well known as one of the best panchromatic dyes. DSC using dye (1) showed a low solar energy conversion efficiency (η) because of a narrow energy gap (ΔG1) between HOMO level of dye(1) and I-/I3- redox energy level. On the other hand, DSC using dye (2) produced such a high photocurrent (Jsc) as 25.4mA/cm2. However this cell could not show a high efficiency such as 10% because of a narrow energy gap (ΔG2) between LOMO level of dye (2) and TiO2 conduction band. Finally, DSC using newly synthesized dye (3) showed such a high efficiency as 10.2% because of its suitable HOMO-LUMO energy levels, having optimum energy gaps of ΔG1 and ΔG2.

Paper Details

Date Published: 12 November 2007
PDF: 12 pages
Proc. SPIE 6656, Organic Photovoltaics VIII, 665609 (12 November 2007); doi: 10.1117/12.732807
Show Author Affiliations
Takeshi Yamaguchi, Tokyo Univ. of Science (Japan)
Naoyuki Shibayama, Tokyo Univ. of Science (Japan)
Makoto Nakade, Tokyo Univ. of Science (Japan)
Yoshimoto Abe, Tokyo Univ. of Science (Japan)
Hironori Arakawa, Tokyo Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 6656:
Organic Photovoltaics VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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