Development of new efficient Ru dyes having &#946;-diketonate and terpyridine ligands for solar cells

Takeshi Yamaguchi; Naoyuki Shibayama; Makoto Nakade; Yoshimoto Abe; Hironori Arakawa

doi:10.1117/12.732807

12 November 2007 Development of new efficient Ru dyes having β-diketonate and terpyridine ligands for solar cells

Takeshi Yamaguchi, Naoyuki Shibayama, Makoto Nakade, Yoshimoto Abe, Hironori Arakawa

Proceedings Volume 6656, Organic Photovoltaics VIII; 665609 (2007) https://doi.org/10.1117/12.732807
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

Takeshi Yamaguchi, Naoyuki Shibayama, Makoto Nakade, Yoshimoto Abe, and Hironori Arakawa "Development of new efficient Ru dyes having β-diketonate and terpyridine ligands for solar cells", Proc. SPIE 6656, Organic Photovoltaics VIII, 665609 (12 November 2007); https://doi.org/10.1117/12.732807

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