Photoelectrochemical behaviour of tin monosulphide

Add time:07/27/2019    Source:sciencedirect.com

Polycrystalline samples of tin monosulphide were prepared by passing H2S through an acidic solution of stannous chloride. The structure and the composition of the samples were confirmed by X-ray diffraction and energy dispersive analysis of X-rays. Hall measurements showed the samples to be n type and the mobility of the majority carriers was found to be 11.4 cm2 V−1 s−1. Reflectance spectra of the powder samples indicated a band gap of 1.29 eV. The photoelectrochemical behaviour of n-SnS was studied in Fe3+/Fe2+, Ce4+/Ce3+ and I2/I− redox couples. Capacitance measurements yielded a donor density equal to 1.26 × 1016 cm−3, which is in agreement with the value 2.28 × 1016 cm−3 obtained from Hall measurements. Cyclic voltammetric studies on platinum as well as n-SnS were carried out with the best suitable Ce4+/Ce3+ redox couple and the onset potential (+0.46 V vs. a saturated calomel electrode (SCE)) was found to be in good agreement with the value of the flat-band potential obtained from impedance measurements. The semiconductor was found to be stable against photocorrosion in the Ce4+/Ce3+ redox couple over a period of 60 h. A photoconversion efficiency of 0.63% was obtained with the cell n-SnS/Ce4+, Ce3+/Pt. The photoelectrochemical studies were carried out with a tungsten-halogen lamp and with solar radiation. Both illuminations gave similar results.

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