Three new sterically demanding unsymmetrical zinc phthalocyanines have been designed andudsynthesized as sensitizers for dye-sensitized solar cells. All three unsymmetricaludphthalocyanines have been completely characterized by elemental analyses, massudspectrometry, FT-IR, 1H NMR, UV-Visible, and fluorescence (steady-state and life-time)udspectroscopies as well as electrochemical methods. Photophysical properties (absorption,udemission and redox properties) indicate that the LUMO of unsymmetrical phthalocyaninesudlies above the TiO2 conduction band and HOMO is below the redox electrolyte. Theudexperimental results are supported by DFT/TD-DFT studies. Electrochemical and in-situudspectroelectrochemical studies suggest that the redox reactions belong to the macrocyclicudring-based electron transfer processes. All three unsymmetrical phthalocyanines were testedudin DSSC using I-/I3ud- redox electrolyte system.
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