Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Sprayed thin films of Zn-Sn-O and SnO2 as photoanodes for DSSC solar cells
N. Kesri
Univ. of Sci. & Tech.of Houari Boumediene (U.S.T.H.B.), Faculty of Physics, Semiconducting Materials &Metal Oxides Lab. (LSMMO), BP.32, El-Alia, Algiers, Algeria
Large gap metal oxides like titanium, tin and zinc oxides have attracted great interest because of their remarkable potential in the DSSC and their low cost and simple preparation procedure. Recently, people are pursuing some new materials for replacing the widely used TiO2 in order to avoid its limitations and agree in that Zn2SnO4 (ZTO) is a promising material for DSSCs. In DSSCs, the recombination of the photo-excited electrons with the electrolyte ions is one of the principal factors that limits the photocurrent quantum efficiency and to some extent the open circuit photovoltage Voc. For suppressing the recombination, one way is the formation of heterojunction between two oxides as SnO2 and Zn2SnO4. By coupling these different semiconductor oxides, more efficient spatial separation of photogenerated charges appears and it result decrease of recombination. In this work, several SnO2 and Zn-Sn-O thin films are sprayed as electrodes for dye sensitized solar cells (DSSC). The preparation of cells comprises the following steps: a tin oxide (TO) thin film, acting as transparent and conducting electrode (TCO), is deposited on glass by spray and characterized, followed par a zinc-tin oxide (ZTO) film. Then, a layer of nanoporous TiO2 was done with the doctor blade method and the TiO2-particles are sensitized with an eosin aqueous solution. For the counter electrode, a thin film of carbon is past on SnO2 TCO glass. An electrolyte based on I-/I3- solution is injected on the TiO2-particles before sealing.
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