Electron dynamics dependence on optimum dye loading for an efficient dye-sensitized solar cell

摘要: Abstract Increasing surface area and optimum dye loading are among the prerequisites for an efficient TiO 2 -based dye-sensitized solar cell (DSC), since they improve light harvesting but, at same time, affect, in a variant way electron dynamics semiconductor. Into this context, work, interdependence of these two effects was investigated. The thermal annealing conditions nanocrystalline titania films were modified between 400 550 °C order to vary crystallinity aggregation/sintering degree semiconductor particles. on structural parameters determined inside elucidated. film properties found correlate with photoelectric conversion efficiencies corresponding DSCs terms efficiency, transport, recombination trapping states. Despite higher loading, relatively low efficiency (5.3%) attained temperature 400 °C, due insufficient neck growth presence states that not removed by annealing. On contrary, highest (6.4%) 550 °C, where high values diffusion coefficients enhanced lifetimes observed despite significantly lower loading. above results point out significance properly controlling both photoelectrode sensitization large band gap