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Effect of deposition temperature on structural, optical and electrical properties of copper bismuth sulphide (CuBiS2) thin films deposited by chemical bath deposition

Balasubramanian V., Kumar P. N., Sengottaiyan D.

Materials Science Poland

2017

Vol. 35, No. 2

329--334

The effect of deposition temperature on the structural, optical and electrical properties of copper bismuth sulphide (CuBiS2) thin films deposited by chemical bath deposition onto glass substrates at different deposition temperatures (40 °C, 50 °C, 60 °C and 70 °C) for 5 hours deposition time period was investigated. The obtained films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and optical absorption spectra. All deposited films were polycrystalline and had an orthorhombic structure. Their grain size had changed with deposition temperature and their compositions were nearly stoichiometric. The optical band gap value was decreased from 2.44 eV to 2.33 eV with increasing the film thickness. Electrical parameters such as mobility and type of electrical conduction were determined from the Hall effect measurements. They showed that the obtained films have n-type conductivity and mobility values of the copper bismuth sulphide (CuBiS2) films have changed with deposition temperature.

Preparation and ferroelectric properties of the thin LiNbO3 and BaTiO3 films

Surowiak Z., Czekaj D., Bakirov A.A., Dudkevich V.P.

Archiwum Nauki o Materiałach

2000

T. 21, nr 1

5-19

Technological conditions of the BaTiO3 and LiNbO3 thin film preparation by r.f. sputtering are presented. It was found that the thin films obtained were characterized by the polycrystalline structure. However, the type of texture as well as the degree of teksture of the formed thin films depended on the technological conditions of the thin film preparation. It was also determined that both BaTiO3 and LiNbO3 thin films showed ferroelectric properties similar to the ones of bulk ferroelectrics. Some peculiarities of the prepared thin films were observed, namely diffused phase transition and the state of intrinsic unpolarity (self-contained polarization).

Przedstawiono warunki otrzymywania cienkich warstw LiNbO3 i BaTiO3 metodą rozpylania w polu w.cz. Otrzymane cienkie warstwy wykazywały strukturę polikrystaliczną . Stopień i rodzaj tekstury takich cienkich warstw zależy od warunków ich otrzymywania. Stwierdzono, że cienkie warstwy BaTiO3 i LiNbO3 charakteryzują się właściwościami ferroelektrycznymi zbliżonymi do właściwości typowych dla ferroelektryków masywnych. Osobliwością otrzymywanych cienkich warstw jest rozmycie przemiany fazowej i obecność wewnętrznej unipolarności (samoistnej polaryzacji).