Abstract
AbstractResults are reported on the flat band potential Vfb of the contact TiO2/CH3CN. The informations were taken from capacitance/voltage and photocurrent/voltage measurements. As electrolyte either pre‐dried CH3CN or various mixtures of dried CH3CN with H2O were used. It was found that both the addition of H2O and illumination with band gap light affect Vfb considerably. – It could be shown that Vfb‐values determined from photocurrent/potential measurements differ up to 2 V from values evaluated from capacitance/potential measurements taken on unilluminated electrodes. However, Vfb‐values obtained from capacitance measurements on pre‐illuminated electrodes agree well with data from photocurrent measurements. The results are discussed in terms of alterations of the inner Helmholtz plane. Finally, consequences of the observed Vfb shifts on the charge transfer process are outlined.
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