Publication date: 1st April 2013
The establishment of nanocrystalline titania as the standard photocatalyst for mesoscopic solar cells has incited an intense activity for the search of new visible light sensitizers of this large band gap semiconductor. A new class of sensitizers is a family of organometal halide perovskites of the general formula RNH3MX3, for example, CH3NH3PbI3 [1,2]. These materials have unique optical, excitonic and electrical conductivity properties [1] and have been shown to be efficient sensitizers of nanocrystalline titania. In addition, they are easily formed by adsorption on nanocrystalline titania of their components CH3NH3X and MX2 from the same solution and formation of the organometal halide by heating at elevated temperature. Organometal halide perovskites are not stable in contact with a liquid phase but they are very fit to the case of solid state sensitized solar cells. For this reason they are very promising for the development of the long time sought solid state sensitized solar cell. In the present work, nanocrysytalline titania photoanodes were sensitized by CH3NH3PbI3, which was formed by treatment at different temperatures. The photoanodes were then assembled with organic hole conductors to make solar cells at ambient conditions and by simplified procedures.
[1] Kojima, A. et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J.Am.Chem.Soc. 2009, 131, 6050-6051 [2] Lee M.M. et al. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647
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