9 eV [11]. All the binding energies are referenced to the clean Ag 3ds/2 peak at 368.22 eV. Results and discussion Film structure A multilayer thin-film structure with maximum transmittance can be designed using the Macleod
simulation software. The admittance diagram of a three-layer TAS film structure allows us to determine the optimal thickness of each layer. The function of the Ag layer, which should be thick to achieve good conductivity, is mainly to filter UV and IR light; on the other hand, the TiO2 and SiO2 films are expected to increase the transmittance of visible light. Sawada et al. [12] highlighted that a 10-mm-thick Ag layer led to fewer variations in the sheet resistance, and the transmittance was inversely Barasertib price proportional to the thickness of the metal layer. The optimal thickness of the Ag layer was found to be 10 mm. The thickness of the bottom TiO2 layer should be in the range of 20 to 25 nm and that of the top protective layer in the range of 65 to 75 nm (these are the best values to reduce the distance of equivalent admittance and air admittance). Minimal reflection conditions can be achieved by considering these restrictions. In this way, we
calculated the value of yE for different thicknesses of the TiO2 and SiO2 films (Table 2). Figure 1 shows the structure of the studied multilayer film: substrate/TiO2/Ag/SiO2/air. Table 2 Optical spectra of a substrate TiO 2 /Ag/SiO 2 /air structure simulated using the Macleod software Value of yE (Tio2/Ag/SiO2) Re (admittance) Montelukast Sodium Im (admittance) 20:10:20 nm selleck chemical 0.87 −1.42 40:10:40 nm 0.78 −0.98 60:10:60 nm 0.66 −0.78 20:10:40 nm 0.6 −0.95 25:10:70 nm 0.7 −0.40 Figure
1 Structure of the transparent film (TiO 2 /Ag/SiO 2 , TAS). Each layer was fabricated by E-beam evaporation with IAD. Crystallinity Figure 2 shows the XRD patterns obtained for the multilayer structure deposited by E-beam evaporation with IAD at room temperature. As seen in the XRD patterns, the TiO2 and SiO2 thin films evaporated on glass (an amorphous substrate) preferred to grow amorphously. A peak corresponding to crystalline Ag was also clearly visible, showing preferred click here growth of the metal in the (111) direction. This might be the result of using a high-momentum ion beam, since such beams can increase the evaporation rate and decrease the amount of Ag that is oxidized. Figure 2 XRD patterns of TiO 2 and SiO 2 thin films fabricated on glass. XRD patterns showing that the TiO2 and SiO2 thin films fabricated on glass by E-beam evaporation with IAD exhibit a preferential amorphous growth. Optical spectroscopy of the conductive and transparent films Figure 3 shows the transmittance spectra of several coatings. The TAS film has a layer-wise thickness of 25:10:70 nm. The thickness of the Ag layer was found to affect the transmittance of the incident light from the glass substrate, which decreased gradually with increasing thickness.