This paper proposes a new, robust and generic tool to investigate both the series and the shunt resistances, (parasitic resistances), as well as the ideality factor for new generations of solar cells. Focus is given to both dye-sensitized solar cells and perovskite solar cells, where the mesoporous TiO2 layer plays a significant role. A comprehensive study for the mesostructured-based solar cells with respect to conventional solar cells has been conducted regarding the parasitic resistance variation, the effect of the active material and technology on the ideality factor. Experimental data show acceptable agreement with data extracted from the proposed model where the targeted parameters have been estimated.
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