The impact of pH on the structural, surface, electrical and optical properties of nanostructured PbSe thin films

This study involves PbSe deposits fabricated on glass substrates at different pH. Some optical properties of these deposits, including reflectance, extinction coefficient, refractive index, and dielectric constant were calculated by using absorbance values at room temperature with UV spectrophotometer according to wavelength. The surface properties and compositions were examined by SEM and EDX, respectively. Surface tensions were measured by Zisman Method, and obtained to be 39.0, 42.1, 43.1 and 39.1 mNm(-1) for pH: 8, 9, 10 and 11 values, respectively. The optical band gaps (Egap) were calculated as 2.17, 1.82, 1.77 and 2.27 eV for pH: 8, 9, 10 and 11, respectively. PbSe deposits' electrical resistivity was measured via four-point probe technique depending on deposits thicknesses, and they were found to be 65.27, 26.21, 39.87 and 36.03 Omega cm for pH: 8, 9, 10 and 11, respectively

A novel method: Bio-chemical bath for producing vanadium oxide thin film

In this study, a new method for the production of vanadium oxide thin films has been developed. Structural analyzes of films produced in the study were performed by FTIR; whereas surface properties were examined by SEM analysis. Optical properties were measured by UV-VIS spectrophotometer and electrical characterizations were made by I/V measurements. Optical transmission curves were found to be near 60% in the vicinity of the NIR region, with a refractive index around 2.11. Films produced with urease were found to have a resistivity of less than 0.01 Omega cm. It was observed that film thicknesses varied in the range of 35-62 nm regarding the measurements made with AFM device. Surface tensions of the films were calculated using the Zismann method, which were found to vary from 19.4 to 41.5 mN/m. (c) 2018 Elsevier B.V. All rights reserved

STRUCTURAL AND OPTICAL PROPERTIES OF UNDOPED AND SILVER, LITHIUM AND COBALT-DOPED ZnO THIN FILMS

Undoped and silver, lithium and cobalt-doped ZnO thin films have been successfully deposited on glass by chemical bath deposition (CBD). The reaction temperature was 50 degrees C and the films were annealed at 400 degrees C for 4h in a high temperature furnace. UV/VIS spectrum was used to determine optical transmittance, optical band gap (E-g) and absorbance values of Ag:ZnO, Co:ZnO, Li:ZnO and undoped ZnO thin films. Optical band gap (E-g) and absorbance values of undoped ZnO, Ag: ZnO, Co:ZnO and Li:ZnO thin films were found as 0.0158, 0.0064, 0.2638, 0.0956 and 3.24, 3.13, 3.27, 2.96 eV, respectively. Extinction coefficients and refraction indexes of the films were found to be 0.0096, 0.0038, 0.0068, 0.019 (extinction coefficient) and 1.26, 1.14, 1.66, 2.33 (refraction index), respectively. X-ray patterns of undoped ZnO, Ag:ZnO, Co:ZnO and Li:ZnO thin films were confirmed as amorphous