Ternary cadmium zinc sulphide films with high charge mobilities

• Ternary CdxZn1-xS films are obtained by acidic chemical bath deposition.
• Doping of Zn possible across the whole composition range.
• The optical band gap varies linearly at low Zn doping levels.
• All the thin films obtained have superior carrier mobilities.

Cadmium zinc sulphide thin films with high charge mobilities are obtained from acidic chemical baths employing the corresponding metal chlorides, urea and thioacetamide. The films are characterized by powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, inductively coupled plasma mass spectrometry, absorption spectroscopy and charge transport measurements. The compositional control afforded by the technique and the resultant changes in the structural, optical and electronic properties of the films are critically examined. We find good correlation between structure and properties at extremes of the composition range.

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