Abstract
The basic photoelectrochemical behaviour and some physical quantities of the ternary semiconductor n-Zn 3In 2S 6 have been investigated for the first time. From the photocurrent actions spectrum in 1M Na 2SO 4 a direct optical band gap energy ( E g) equal to 2.81 eV has been determined. From capacity measurements a flat band potential ( V FB 0 − 1.29 V SCE) has been calculated, as well as the donor density, the conduction and the valence band edge. With pH increasing, a shift of the photocurrent onset potential ( V on) to more cathodic values has been observed. The presence of redox systems such as Na 2S/NaOH, Na 2SO 3, K 3[Fe(CN) 6]/ K 4[Fe(CN) 6], Ce 3+/Ce 4+ improves the stability of the electrodes and produces reasonable photovoltages.
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