Near-infrared absorbing unsymmetrical Zn(II) phthalocyanine for dye-sensitized solar cells

Singh, Varun Kumar and Salvatori, Paolo and Amat, Anna and Agrawal, Saurabh and De Angelis, Filippo and Nazeeruddin, Md.K. and Krishna, Narra Vamsi and Giribabu, Lingamallu (2013) Near-infrared absorbing unsymmetrical Zn(II) phthalocyanine for dye-sensitized solar cells. Inorganica Chimica Acta, 407. pp. 289-296. ISSN 0020-1693

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Unsymmetrical Zn phthalocyanine consisting of six S-aryl groups at α-positions and a carboxy anchoring group at β-position has been designed and synthesized for dye-sensitized solar cells (DSCs) applications. The unsymmetrical phthalocyanine has been characterized by elemental, MALDI-MS, IR, 1H NMR, UV–Vis, fluorescence (steady-state & lifetime) and electrochemical (including spectroelectrochemical) methods. The Q-band absorption maxima of the unsymmetrical phthalocyanine was red-shifted due to the presence of S-aryl groups, which destabilizes the HOMO level consistent with electrochemical and in situ spectroelectrochemical studies. The redox processes are assigned to the macrocyclic ring-based electron transfer processes, the LUMO of the unsymmetrical phthalocyanines lies above the TiO2 conduction band, and the HOMO is well below the potential of the I−/I3− redox electrolyte. The experimental results are supported by DFT/TD-DFT studies. The new unsymmetrical phthalocyanines was tested in DSCs using I−/I3− redox electrolyte system.

Item Type: Article
Uncontrolled Keywords: Phthalocyanine; Unsymmetrical phthalocyanine; Dye-sensitized solar cells; Spectroelectrochemal; Redox electrolyte
Subjects: 500 Scienze naturali e Matematica > 540 Chimica e scienze connesse
Depositing User: Francesca Cavazzini
Date Deposited: 12 Dec 2013 16:04
Last Modified: 12 Dec 2013 16:04

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