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[en] The thin films of cadmium indium selenide (CdIn2Se4) have been deposited onto amorphous glass substrates using simple and low cost spray pyrolysis technique. The aqueous solutions containing precursors of Cd, In and Se have been used to obtain good quality deposits at different substrate temperatures. The preparative parameters, such as substrate temperature and concentration of precursor solution have been optimized and are found to be 280 deg. C and 0.0125 M, respectively. The films have been characterized by X-ray diffraction (XRD), optical absorption and energy dispersive analysis by X-rays (EDAX) techniques. The spray-deposited CdIn2Se4 films are polycrystalline with cubic crystal structure. The optical absorption studies reveal that the transition is direct with band gap energy Eg=1.92 eV. The EDAX studies reveal that the films obtained at substrate temperature 280 deg. C are nearly stoichiometric
[en] Highlights: • A novel chemical route to prepare α-Sm2S3 thin films. • A porous honeycomb like morphology of the α-Sm2S3 thin film. • An application of α-Sm2S3 thin film toward its supercapacitive behaviour. - Abstract: The paper reports synthesis of porous α-Sm2S3 thin films using modified chemical synthesis, also known as successive ionic layer adsorption and reaction (SILAR) method. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), wettability and ultraviolet–visible spectroscopy (UV–vis) techniques are used for the study of structural, elemental, morphological and optical properties of α-Sm2S3 films. An orthorhombic crystal structure of α-Sm2S3 is resulted from XRD study. The SEM and AFM observations showed highly porous α-Sm2S3 film surface. An optical band gap of 2.50 eV is estimated from optical absorption spectrum. The porous α-Sm2S3 thin film tuned for supercapacitive behaviour using cyclic voltammetry and galvanostatic charge discharge showed a specific capacitance and energy density of 294 Fg–1 and 48.9 kW kg–1, respectively in 1 M LiClO4–propylene carbonate electrolyte
[en] Highlights: • The Sm2Te3 thin films are prepared by simple chemical bath deposition (CBD) method. • The porous microstructure developed due to barley-like morphology of Sm2Te3 is used as supercapacitor electrode. • The Sm2Te3 thin film exhibit maximum power density of 14.18 kW kg−1. The letter reports synthesis of samarium telluride (Sm2Te3) thin films through a one-step chemical route. The formation of Sm2Te3 is confirmed by X-ray diffraction and X-ray photoelectron spectroscopy studies. The surface morphological study is carried out using field emission scanning electron microscopy and contact angle measurement techniques. The film shows barley-like microstructure with an average length of barley of about 5 μm and diameter of about 300 nm. The Sm2Te3 film surface exhibits lyophilic nature with contact angle of 21.3° for propylene carbonate electrolyte. Cyclic voltammetry results revealed specific capacitance of 207 F g−1 with power density of 14.18 kW kg−1 in LiClO4-propylene carbonate electrolyte.