NDLI: Ruthenium(II)- bipyridyl with extended π-system: Improved thermo-stable sensitizer for efficient and long-term durable dye sensitized solar cells

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Ruthenium(II)- bipyridyl with extended π-system: Improved thermo-stable sensitizer for efficient and long-term durable dye sensitized solar cells

Content Provider	Springer Nature Link
Author	SRINIVASA RAO, CH REDDY, P Y
Copyright Year	2011
Abstract	A new extended thermo-stable high molar extinction coefficient bipyridyl ruthenium(II) complex “cis-Ru(4,4’-bis(3,5-di-tert-butylphenyl)-2,2’-bipyridine)(Ln)(NCS)$_{2}$ H101”, where Ln = 4,4’-dicarboxylic acid-2,2’-bipyridine; was synthesized and characterized by $^{1}$H-NMR, FT-IR and ESI-MASS spectroscopes. The H101 sensitized solar cell constructed with an active area of 0.54 cm$^{2}$ in combination with an ionic liquid electrolyte exhibited broader photocurrent action spectrum with solar-to-electric energy conversion efficiency (η) of 5.89 ( $\textbf{\textit{J}}_{\rm SC} =$ 12.14 mA/cm$^{2}$, $\textbf{\textit{V}}_{\rm OC} =$ 690 V, fill factor = 0.699) under Air Mass (AM) 1.5 sunlight, while the reference ‘cis-Ru(4,4’-dinonyl-2,2’-bipyridine)(Ln)(NCS)$_{2}$’, Z907 sensitized solar cell exhibited η-value of 5.17% ( $\textbf{\textit{J}}_{\rm SC} =$ 11.93 mA/cm$^{2}$, $\textbf{\textit{V}}_{\rm OC} =$ 650 V, fill factor = 0.666). TGA analysis of H101 showed extended thermal-stability and under continuous light exposure and aging at 55°C, the DSSC retained 85% of its initial η-value, while under comparable conditions Z907 sensitized solar cell retained 88%. As compared to 4,4’-dinonyl-2,2’-bipyridine in Z907, the new ancillary bipyridyl ligand ‘4,4’-bis(3,5-di-tert-butylphenyl)-2,2’-bipyridine’ in H101 shifts the absorption bands remarkably towards blue. The Density Functional Theory (DFT) and Time-Dependent DFT excited state calculations of the new sensitizer show that the first three HOMOs have t2g character with sizeable mixing from the NCS ligands with π-bonding orbitals of 4,4’-bis(3,5-di-tert-butylphenyl)-2,2’-bipyridine. The LUMO is a π-orbital localized on the 4,4-dicarboxylic acid-2,2’-bipyridine and higher un-occupied frontier orbitals have π-combinations with 4,4’-bis(3,5-di-tert-butylphenyl)-2,2’-bipyridine. Graphical Abstract A new extended thermo-stable high molar extinction coefficient bipyridyl ruthenium(II) complex “cis-Ru(4,4’-bis(3,5-di-tert-butylphenyl)-2,2’-bipyridine)(Ln)(NCS)2 H101” (where Ln = 4,4’-dicarboxylic acid-2,2’-bipyridine) was synthesized. The test cell DSSC constructed from H101 sensitizer with an active area of 0.54 cm2 in combination with an ionic liquid electrolyte exhibited broader photocurrent action spectrum with solar-to-electric energy conversion efficiency (η) of 5.89 (J SC = 12.14 mA/cm2, V OC = 690 V, fill factor = 0.699) under Air Mass (AM) 1.5 sunlight.
Starting Page	555
Ending Page	565
Page Count	11
File Format	PDF
ISSN	09743626
Journal	Journal of Chemical Sciences
Volume Number	123
Issue Number	5
e-ISSN	09737103
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-10-07
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dye sensitized solar cells extended π-system thermo-stable Polypyridyl Ru(II)-sensitizers Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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