Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The performance of dye-sensitized solar cells (DSCs) could be improved by using rationally designed mesoporous film structure for electron collection, dye adsorption and light scattering. Electron transport and recombination process is the key process to realize high performance and stability in dye-sensitized solar cells.[1,2]This presentation will describe recent work on the design, fabrication, and utilization of submicrospherephotoelectrodes.
Here we introduce a hierarchical TiO2 submicrospheres composed of nanorods to fabricate photoanode films, which not only promote the light scattering, but also improve the charge collection efficiency. In addition, the added advantage is fast I-/I3- ion diffusion at the semiconductor-electrolyte interface. The hierarchical spheres were composed of the rutile nanorods of which the diameter and length were about 5-10 nm and 150-250 nm, respectively. The submicron sphere could scattered the visible light efficiently and collected the photoelectrons rapidly.The hierarchical TiO2 submicrospheres are mixed with anatase nanoparticles to enhance connection between spheres and yield high power conversion efficiency. We have systematically studied electron transport and recombination process in dye-sensitized solar cells with nanoparticles and submicrospherefilms.
Figure 1. (a) FE-SEM image of TiO2 submicrospheres; (b) The J-V characteristics of DSCs based on a double layer structure mesoporous films.
[1] D. X. Kou; W. Q. Liu; L. H. Hu; S.Y. Dai, Cooperative Effect of Adsorbed Cations on Electron Transport and Recombination Behavior in Dye-Sensitized Solar Cells, Electrochimica Acta, 2013, 100, 197-202. [2] C. N. Zhang; Y. Huang; S. H. Chen; H. J. Tian; L. E Mo, L. H. Hu, Z. P. Huo, F. T. Kong, Y. W. Ma, S. Y. Dai, Photoelectrochemical Analysis of the Dyed TiO2/electrolyte Interface in Long-term Stability of Dye-sensitized Solar Cells, J. Phys. Chem. C, 2012, 116, 19807-19813.
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