Abstract
This work reports on the preparation of Mg salts [MS; MgCO 3 and Mg(CH 3COO) 2]-modified TiO 2 electrodes by very simple dip coating and effects on the photovoltaic properties of dye-sensitized solar cells (DSSCs) with them. The DSSC with MS-modified TiO 2 layer showed an increase in short-circuit current ( J sc ) and open-circuit voltage ( V oc) , resulting in a power conversion efficiency (PCE) of 8.48% compared to that (7.27%) of reference device with bare TiO 2. The improved J sc value was attributed to the increased dye adsorption. Electrochemical impedance spectroscopy, dark current–voltage and incident photon-to-current conversion efficiency studies revealed that the V oc enhancement was caused by the conduction band edge shift of TiO 2 to a more negative potential due to the formation of a surface dipole.
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