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Influence of pH Value on the Phases, Morphologies and Optical Properties of Sm2S3 Thin Films

Sm2S3 thin films were prepared on Si (100) substrates by liquid phase self–assemble method. The influences of solution pH value on the phases, surface morphologies and optical properties of the as deposited films were investigated. The as–deposited Sm2S3 thin films were characterized by X–ray diffraction (XRD), atomic force microscopy (AFM) and ultraviolet-visible (UV–Vis). Results indicate that Sm2S3 thin film with oriented growth along (105) direction can be obtained at pH value of 3.0, deposition temperature of 80 °C, following deposition for 24 h. The grain sizes of the Sm2S3 first increase and then decrease with increasing pH value. The as–deposited thin films exhibit a dense and crystallinized surface morphology. The film shows good transmittance in visible spectrum and excellent absorbency of ultraviolet light, and the bandgap of the thin films at pH of 3.0 is calculated to be 4.06 eV.