Antimony Sulphide Thin Films
Antimony trisulphide has been prepared with n-type conductivity, in + the form of thin polycrystalline films. These films were obtained by a tarnishing, or gas-solid reaction between metallic antimony and sulphur vapour, and their properties studied by photoelectrochemical techniques. An analysis of photocurrent-voltage curves and photocurrent spectra allows an estimation of the following parameters: band-gap 1.62 eV, flat band potential -0.45 V (SCE) and donor density approximately 1014 cm-3. Spectroellipsometric measurements confirmed the high optical absorption coefficients previously reported for this material. Photovoltages of up to 400 mV have been observed, and monochromatic quantum yieds of over 60%. Preliminary experiments have indicated that photocorrosion may be suppressed in organic electrolytes.
KeywordsFlat Band Potential Sulphur Vapour Thin Polycrystalline Film Sulphide Thin Film High Optical Absorption Coefficient
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