Binuclear Complex of Zinc and Copper with Unsymmetrical Macrocyclic Ligand as Sensitizer in Nanocrystaline TiO2 Solar Cells

Document Type: Research Paper

Authors

Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

Abstract

Dye sensitized solar cells (DSSCs) are considered as one of the most promising alternative
renewable energy sources. In the structure of DSSCs, a photosensitizer composed of transition
metal complexes is used to harvest light. In this work a binuclear complex containing two
propionitrile pendant arms [ZnLCu(OAC)]PF6 {L = 1, 6- bis (2-cyanoethyl) -2, 5-bis (2-hydroxy
3-formyl-5-methylbenzyl)-2, 5- diazahexane} has been examined as a non-planar metal based
photosensitizer in the fabrication of dye sensitized solar cell. The photovoltaic performance of
the fabricated cell was evaluated and photovoltaic parameters were determined. The results
showed the conversion efficiency of 0.17%, current density of (Jsc) 0.69 mAcm-2, voltage (Voc)
0.38 v and fill factor (FF) of 0.69 under sun (Am1.5) for the cells. Electrochemical impedance
spectroscopy (EIS) and cyclic voltammetry (CV) were employed to study the electron transfer
mechanism in fabricated cells. The results showed that the potential in cathodic current was more
positive indicating that the conduction band position of TiO2 had shifted to positive energies
confirming less Voc of the fabricated cell.

Keywords