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The effect of S content on the electrical property of the sol–gel SnS x films was examined. The observed conduction-type changes are related to the different ratios between the concentrations of Sn 4+ and Sn 2+ . The experimental identification confirms that n-type conversion is due to an increase in the atomic concentration ratio of Sn 4+ /(Sn 4+ +Sn 2+...
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