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Effect of RF power on the structural and optical properties of zns thin films prepared by RF-sputtering

Journal of Semiconductors 2018年第12期39卷 26-31页

作者： C.M.Samba Vall M.Chaik H.Ait Dads H.El Aakib M.Elyaagoubi M.Aggour A.Outzourhit Laboratory of Nanomaterials for Energies and Environments Faculty of Sciences Semlalia Cadi Ayyad University Laboratory of Renewable Energy and Environment Faculty of Science Kenitra Ibn Tofail University

Zinc sulphide(zns) thin films have grown on glass and Si substrates by reactive cathodic radio frequency(RF) sputtering. The RF power was varied in the range of 100 to 250 W, while the deposition time is set at75 min. The optical, structural, and morphological properties of these thin films have been studied. The optical properties(mainly thickness, refractive index,absorption coefficient, and optical band gap) were investigated by optical transmittance measurements in the wavelength range of ultraviolet-visible-near infrared spectroscopy and spectroscopy infrared with Fourier transform. Fourier(FT-IR) and XRD analysis indicated that all sputtering zns films had a single-phase with a preferred orientation along the(111) plane of the zinc sphalerite phase(ZB). The crystallite size ranged from 11.5 to 48.5 nm with RF power getting a maximum of 200 W. UV-visible measurements exhibited that the zns film had more than 80% transmission in the visible wavelength region. In addition, it has been observed that the band gap energy of zns films is decreased slightly from 3.52 to 3.29 eV, and as the RF power is increased, the film thickness increases with the speed of deposit growth. Scanning electron microscopy observations revealed the types of smooth-surfaced films. The measurements(FT-IR) revealed at wave number1118 and 465.02 cmabsorption bands corresponding to the symmetrical and asymmetric vibration of the Zn-S stretching mode. X-ray reflectometry measurements of zns films have shown that the density of the films is(3.9 g/cm~3) close to that of solid zns.

关键词： zns thin films by sputtered RF-sputtering zns zns buffer layer for solar cell

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