Preparation and characterization of CdIn2S4 wedgelike thin films

Cadmim Indium sulfide (CdIn₂S₄) thin films composed of wedgelike crystals were prepared on fluorine-doped tin oxide substrate by a tartaric acid assisted hydrothermal method. The tartaric acid was found to play an important role in the formation of the final product. The formation mechanism of the CdIn₂S₄ film was also discussed. The optical properties and microstructure of the CdIn₂S₄ films were characterized by X-ray diffraction, field-emission scanning electron microscopy, and UV-vis absorption spectroscopy. The results revealed that the wedgelike CdIn₂S₄ thin films were crystallized in the cubic spinel structure. The analysis of optical absorption data shows bandgap energy to be 2.46 eV which is optimal for photovoltaic applications.