No abstract

No abstract

No abstract

The oblique angle deposition technique has attracted a lot attention in many different applications due to its unique advantage of programmable nanocolumns. In this work we use this technique to investigate the physical properties of obliquely thermal evaporated Sn 3 Sb 2 S 6 thin films deposited onto unheated glass and silicon substrates, inclined from the flux vapor source at the deposition angles 0°, 40°, 60°, 75°and 85°. X-ray diffraction (XRD) and UV-Visible and near infrared (UV-Vis-IFR) analysis were used respectively to characterize the structural and optical properties of the layers. The influence of flux angle on the surface morphology and the microstructure was investigated by using scanning electron microscopy. The optical constants were obtained from analysis of the experimental recorded transmission and reflectance spectral data over the wavelength range 300 nm to 1800 nm. The band gaps of the synthesized thin films were found to be direct allowed transitions and increased from 1.44 eV to 1.66 eV with increasing c from 0°to 85°, respectively. The absorption coefficients of the films are in the range of 10 5 cm À1 to 10 6 cm À1 . The refractive indexes were evaluated in the transparent region in terms of the envelope method suggested by the Swanepoel model. It has been found that the refractive index decreases from 2.66 to 2.06 with increasing deposition angle from 0°to 85°, respectively. The relationship between the flux incident angles c and the column angle b was also explored. The oblique angle deposition films showed an inclined columnar structure, with columns tilting in the direction of the incident flux. The effective packing densities of the synthesized Sn 3 Sb 2 S 6 thin films were calculated using Bruggeman effective medium approximation.

Cu 2 SnS 3 (CTS) nanoparticles were successfully synthesized by simple solvothermal technique maintained at 200°C for 24 h. The structural properties showed that the Cu 2 SnS 3 nanoparticles exhibit cubic phase with high crystallinity and a grain size between 11 and 15 nm. CTS nanoparticles exhibited a broad absorption in a wide wavelength range from UV to visible light, with a direct band gap of 1.27 eV. The electrical proprieties of the synthesized material show a variation of the conductivity as a function of measurement temperature. The dc sample conductivity measurements reveal that 3D-VRH is the dominated conduction model in the studied material. However, the dynamic conductivity study shows that correlated barrier hopping model may be appropriate to describe the transport mechanism in our material.

No abstract

No abstract

No abstract