Effects of solvents on the band energetics of nanostructured BaTiO₃ electrodes for dye sensitised solar cells
by Hongjun Wang; Qi Zhang; Wenbo Zhang; Shuming Yang
International Journal of Nanomanufacturing (IJNM), Vol. 12, No. 3/4, 2016

Abstract: The flat band edges (E_fb) of nanostructured BaTiO₃ electrodes were determined in acetonitrile (ACN), acetylacetone (Acac) and ACN/Acac with spectroelectrochemistry measurements. E_fb of −1.1, −1.01 and −0.82 V and the total trap state densities of 1.32 × 10¹⁶, 3.63 × 10¹⁵ and 1.72 × 10¹⁵ cm⁻² were measured in ACN, Acac and ACN/Acac (all containing 0.2 mol • L⁻¹ TBAP) with trap distribution maximum located at −0.9, −0.8 and −0.3 V. The nanostructured BaTiO₃ electrodes were sensitised with dye N719 and its photovoltage-photocurrent curves were characterised in three electrolytes with ACN, Acac and ACN/Acac as solvent respectively. The N719 sensitised BaTiO₃ showed the highest open-circuit voltage and short-circuit current density in ACN/Acac. The results demonstrated solvents had an important effect on E_fb and the trap state densities of nanostructured BaTiO₃ electrodes. E_fb shifted positive as the coordination ability of solvents became strong, and the corresponding N_trap decreased.

Online publication date: Fri, 23-Sep-2016

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