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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Abstract
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 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/8015 |
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