Electrochemical investigation of Li+ ions in the electrolyte on the performance of dyed Mg2+-doped TiO2 solar cells

Abstract

Abstract This work mainly studies the effect of Li + ions in the electrolyte on the enhancement of photoelectric performance and stability in the dyed Mg 2+ doped TiO 2 solar cells. Measurements of dynamic recombination between interface electron lifetime τ n and short-circuit current J sc suggested that the doped Mg ions as recombination channels, rather than Li + ions, played key role in recombination reaction in Mg 2+ -doped TiO 2 electrodes. The adsorbed Li + on the surface of Mg 2+ doped TiO 2 is mainly attributed to the positive shift of the conduction band edge that resulted in the decreased V oc . It is found that the conduction band edge of Mg 2+ doped TiO 2 electrodes was positively shifted with the increasing concentration of Li + from 0 M to 0.4 M, which led to the increases of the electron injection efficiency η inj and the photocurrent density J sc for Mg 2+ doped TiO 2 solar cells. And the stability of Mg 2+ doped in solar cells showed that the adsorbed and intercalated Li + ion in Mg 2+ doped TiO 2 electrode can improve the cell performance and interface stability.