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For the first time, the elaboration of CuInS2 thin films was achieved using the transducer-based ultrasonic spray pyrolysis method with methanol as solvent. Precursor solutions were prepared with copper dichloride dihydrate [CuCl2.2H2O], indium (III) chloride tetrahydrate [InCl3.4H2O] and thiourea [SC(NH2)2] at different ratios. In2S3 clusters (μdots) were obtained from an aqueous solution with precursors ratio Cu:In:S = 1.3:1:3.9, 1.4:1:3.9, 1.5:1:3.9. CuInS2 thin films were obtained from a solution of methanol with precursors ratio Cu:In:S = 1:1:4. The In concentration was 3 x 10-3 mol/l. The crystalline structure and their morphology ware characterised by SEM and their chemical composition by EDAX, The bandgap of CuInS2, equals to 1.40 eV, was determined by spectrophotometry.
ultrasonic spray pyrolysis, thin films, copper indium disulphide, extremely thin absorbers (ETA), micro-dots, solar cell
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