Abstract
In the present work, the effect and the mechanism of the interaction between 1-methylbenzimidazole (MBI) with Li + and TiO 2 on the performance of dye-sensitized solar cells were explored. A negative shift of the TiO 2 Fermi level of the nanostructured TiO 2 electrode could attribute to the interaction of MBI with Li + and TiO 2, which shown that MBI affects the surface state of the TiO 2 film by decreasing the amount of the adsorbed Li + ions. When MBI was added in the electrolyte, the interfacial exchange current density ( j 0) reduced and the cathodic Tafel slope ( β c) increased in dye-sensitized solar cells due to the reduction of the surface adsorption of Li + and I 3 − ions from the electrolyte. The photovoltaic performance of the dye-sensitized solar cells under UV illumination suggests that the addition of MBI in the electrolyte could improve the efficient and stability of dye-sensitized solar cells.
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