Fabrication, characterization and photovoltaic study of a GaTSPc–CdS/TiO₂ particulate film

Abstract

Quantum-sized cadmium sulfide (CdS) particles have been deposited onto the surface of a microporous titanium dioxide (TiO₂) electrode by the chemical growth method, followed by modification with gallium tetrasulfophthalocyanine (GaTSPc) molecules to prepare a co-modified TiO₂ electrode. Low bandgap semiconductor CdS particles and GaTSPc have different spectral ranges in the visible range. The co-modified TiO₂ electrode effectively absorbed visible light. Experimental results showed that the sensitization of the TiO₂ electrode with CdS and GaTSPc extended the optical absorption spectrum and photocurrent action spectrum into a wider visible range; moreover, the CdS/TiO₂ coupled structure facilitated the photon-to-photocurrent conversion efficiency.

References

1. B. O'Regan and M. Grätzel, Nature (London), 1991, 253, 737.
2. B. O'Regan, J. Moser and M. Grätzel, J. Phys. Chem., 1990, 94, 872.
3. B. O'Regan, M. Grätzel and D. Fitzmaurice, Chem. Phys. Lett., 1991, 183, 89.
4. R. Vogel, K. Pohl and H. Weller, Chem. Phys. Lett., 1990, 174, 241.
5. R. Vogel, P. Hoyer and H. Weller, J. Phys. Chem., 1994, 98, 3183.
6. A. Ennaoui, S. Fiecher, Ch. Pettenkofer, N. Alsonso-Vante, K. Buker, M. Bronold, Ch. Hopfnev and H. Trpbutsch, Sol. Energy Mater. Sol. Cells, 1993, 29, 289.
7. A. Ennaoui, S. Fiechter, H. Tribatsch, M. Giersig, R. Vogel and H. Weller, J. Electrochem. Soc., 1992, 139, 2514.
8. Y. C. Shen, L. Wang, Z. H. Lu, Y. Wei, Q. F. Zhou, H. F. Mao and H. J. Xu, Thin Solid Films, 1995, 257, 144.
9. A. Mondal, T. K. Chaudhuri and P. Pramanic, Sol. Energy Mater., 1983, 7, 431.
10. R. A. Boudred, D. K. Pandga and K. L. Chopra, J. Electrochem. Soc., 1983, 130, 513.
11. J. R. Darwent, P. Douglas, A. Harriman, G. Porter and M. C. Richoux, Coord. Chem. Rev., 1982, 44, 83.
12. A. Henglein, Top. Curr. Chem., 1988, 143, 115.