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Optica Publishing Group
  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper JSI_1_4

Random scatterers by design for record efficiency in plastic dye-sensitized solar cells

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Over the last years, flexible dye-sensitized solar cells (DSCs) have attracted tremendous interests from scientific researchers. Flexible DSCs extends the application of DSCs to be portable and mobile, reaching a record efficiency of 8.1 % at a one sun light intensity (100mW/cm2) [1] while keeping low fabrication costs. The physical compression method is at the origin of such high efficient performance, and it has been believed as the most effective technique to fabricate highly-efficient DSCs on plastic substrates. In addition, it has been widely demonstrated that the inclusion of scatterers embedded in the active layer of DSCs improve their performance due to light trapping by scattering2. A deep analysis of the parameters influencing the operation of DSCs is necessary to move forward to the practical utilization of plastic DSCs. Here, we report the photovoltaic properties of TiO2 electrodes on plastic substrate, prepared from binder-free paste containing “nanoglue”3 (an inorganic interparticle agent for chemical sintering process) and then compressed at 130°C, or hot compressed, featuring the state-of-the-art efficiency of 8.6 % achieved on plastic substrate by employing a Li+ containing electrolyte and multilayered film structure. These experimental achievements are supported by a powerful theoretical model in which the optical response of solar cells containing diffuse scattering particles of TiO2 (of different size and concentration) is taken into account. In particular, the theoretical model consists on a combination of a Monte Carlo approach with Mie theory, in which the angular distribution of scattered and absorbed light by the particles in an external absorbing medium are accounted for.

© 2015 IEEE

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