Solid polymer electrolytes based on polyvinyl alcohol (PVA) doped with LiPF6 have been prepared using solution casting technique. Electrical properties of prepared electrolyte films were analyzed using AC impedance spectroscopy. The ionic conductivity was found to increase with increasing salt concentration. The maximum conductivity of 8.94 × 10−3 S·cm−1 was obtained at ambient temperature for the film containing 20 mol% of LiPF6. The conductivity enhancement was correlated to the enhancement of available charge carriers. The formation of a complex between the polymer and salt was confirmed by Fourier transform infrared spectroscopy (FT-IR). The optical nature of the polymer electrolyte films was analyzed through UV-Vis spectroscopy.
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of all the elements, with strong hybridizations between the Te 5p and Te 5d states, as well as the Se 4p and Se 4d states.
In this section, we discuss the opticalproperties of a material that must be investigated to determine its potential usefulness in optoelectronic applications. For this reason, we only chose the materials that showed a direct band gap character in our LDA study. When examining the optical response of the compounds under investigation, it is convenient to take into account the transitions of electrons from the
Wojciech Kijaszek, Waldemar Oleszkiewicz, Adrian Zakrzewski, Sergiusz Patela and Marek Tłaczała
microelectronics due to their adequate electrical, thermal and mechanical properties. However, SiO 2 dielectric films have reached the technological limit as the properties of silicon dioxide are unsatisfactory for novel micro- and optoelectronic devices. Additionally, the silicon oxynitride films have better not only dielectric, but also opticalproperties. The optical losses in SiO x N y films are significantly lower and the refractive index of the films can be adjusted from 1.46 to around 2.1. Therefore, in the future silicon oxynitride can replace silicon dioxide in the
K. Ephraim Babu, A. Veeraiah, D. Tirupathi Swamy and V. Veeraiah
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electron transition and enhance the light absorption. However, it can also act as recombination centers [ 36 ].
Absorption spectra of pure TiO 2 , Mn/TiO 2 , S/TiO 2 and Mn–S/TiO 2 .
In order to explore the absorption properties, the optical absorption spectra of pure anatase TiO 2 , Mn/TiO 2 , S/TiO 2 and Mn–S/TiO 2 were calculated on the basis of the detailed electronic band structure as shown in Fig. 5 . Because of the underestimated band gap of pure TiO 2 , we induced a scissors operator of 1.032 eV (band gap
ZnO is a direct bandgap wurtzite semiconductor having bandgap of 3.37 eV and large exciton binding energy (∼60 meV) at room temperature [ 1 ]. With the advent of nanotechnology, zinc oxide (ZnO) has been a center of attraction. The reasons for the keen interest in ZnO were attributed to its excellent properties such as easy synthesis, tunable bandgap [ 2 ], controllable shape and size, low cost of production and non-toxicity [ 2 ]. Most important amongst all are its remarkable opticalproperties which allow ZnO to emit light in the entire