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Effect of Adsorbed Cations on Microcosmic Performances in Dye-Sensitized Solar Cells

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Herein, a further investigation about the effect of imidazolium cations on electron transport and recombination behavior in dye-sensitized solar cells (DSCs) is developed in this paper. MPII is synthesized and used as iodide sources and TBAI is applied as a reference. The adsorption amount of MPI+ and TBA+ onto TiO2, band edge shifts, trap states distribution, electron recombination/transport processes and ion transport within the electrolyte are detected. It is found that the multilayered adsorption of MPI+ can induce much less photoinduced electrons and has competition with the effect of lithium ion. As the TBA+ is weak adsorption species, in comparison to MPI+, its coexistence with lithium ion contributes a more band edge positive shift. Furthermore, the reduced effect of Li+ in MPII cell induces a lower short-circuit current density (Jsc) and a higher open-circuit voltage (Voc). Electrochemical impedance spectroscopy indicates that MPI+ can improve the ions transport process in electrolyte, but TBA+ induces large power dissipation due to its large ion radius for contrast. Overall, MPII cell gives a higher efficiency ascribe to the effective improvement of fill factor.

© 2013 Optical Society of America

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