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Advances in OptoElectronics
Volume 2011, Article ID 432803, 11 pages
http://dx.doi.org/10.1155/2011/432803
Research Article

High Molar Extinction Coefficient Ru(II)-Mixed Ligand Polypyridyl Complexes for Dye Sensitized Solar Cell Application

1Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 607, India
2Aisin Cosmos R&D Co. Ltd, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 607, India
3Molecular Modelling Group, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500 607, India

Received 21 April 2011; Accepted 7 June 2011

Academic Editor: Surya Prakash Singh

Copyright © 2011 Malapaka Chandrasekharam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two new ruthenium(II) mixed ligand terpyridine complexes, “Ru(Htcterpy)(NCS)(L1) (N(C4H9)4), mLBD1” and Ru(Htcterpy)(NCS)(L2)(N(C4H9)4), mLBD2 were synthesized and fully characterized by UV-Vis, emission, cyclic voltammogram, and other spectroscopic means, and the structures of the compounds are confirmed by 1H-NMR, ESI-MASS, and FT-IR spectroscopes. The influence of the substitution of L1 and L2 on solar-to-electrical energy conversion efficiency (η) of dye-sensitized solar cells (DSSCs) was evaluated relative to reference black dye. The dyes showed molar extinction coefficients of 17600 M−1 cm−1 for mLBD1 and 21300 M−1 cm−1 for mLBD2 both at λ maximum of 512 nm, while black dye has shown 8660 M−1 cm−1 at λ maximum of 615 nm. The monochromatic incident photon-to-collected electron conversion efficiencies of 60.71% and 75.89% were obtained for mLBD1 and mLBD2 dyes, respectively. The energy conversion efficiencies of mLBD1 and mLBD2 dyes are 3.15% ( 𝐽 S C = 1 1 . 8 6  mA/cm2, 𝑉 O C = 6 1 3  mV, f f = 0 . 4 3 3 7 ) and 3.36% ( 𝐽 S C = 1 2 . 7 1  mA/cm2, 𝑉 O C = 6 5 5  mV, f f = 0 . 4 0 4 2 ), respectively, measured at the AM1.5G conditions, the reference black dye-sensitized solar cell, fabricated and evaluated under identical conditions exhibited η-value of 2.69% ( 𝐽 S C = 1 0 . 9 5  mA/cm2, 𝑉 O C = 6 5 5  mV, f f = 0 . 3 7 5 0 ).