Bandaranayake, K. M. P. and Senevirathna, M. K. Indika and Weligamuwa, P. M. G. M. Prasad and Tennakone, K. (2004) Dye-sensitized solar cells made from nanocrystalline TiO2 films coated with outer layers of different oxide materials. Coordination Chemistry Reviews, 248 (13-14). 1277-1281 .
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The material extensively used for construction of dye-sensitized solar cells is TiO2. Similar cells made from other familiar semiconductor oxide materials such as SnO2 and ZnO have yielded efficiencies far below the values corresponding to TiO2-based cells. The indication is that electrons injected to s-band materials (SnO2) are more susceptible to recombination compared to d-band materials (TiO2). However, an impressive improvement in efficiency has been noticed when SnO2 crystallites are coated with not, vert, similar0.5–1 nm ultra-thin shells of high band gap oxides which act as a barrier against recombination. Naturally a barrier would also lower the electron injection efficiency and oxide barriers of thickness not, vert, similar0.5–1 nm were noted to lower the efficiency of cells based on TiO2. Contrary to our observation, reports in literature gives instances of obtaining higher efficiencies when TiO2 crystallites in the film are coated with other oxide materials. In order to elucidate this problem an extensive series of experiments were conducted by coating TiO2 crystallites with outer shells of different materials of varying thickness. Although there is some evidence for marginal improvement, efficiencies distinctively above the optimized TiO2 could not be achieved by this technique. Experimental details and difficulties involved in making a clear conclusion are discussed.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||28 Oct 2009 05:21|
|Last Modified:||28 Oct 2009 05:21|
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