First Principles Study on Electronic Structure and Optical Properties of PMMA Doped InSb–Mn Alloy Polymer Matrix Composite

InSb the group III-V semiconductor with narrow band gap is combined with Mn in various concentrations and that InSb–Mn alloy is doped with poly methyl methacrylate (PMMA). The optical properties and electronic structure of ternary InSb–Mn alloy with PMMA are investigated by first principles calculations using the DFT method. Varying Mn concentrations play an important role in the improvement of the absorption coefficient and optical conductivity. It is observed that the band gap of InSb–Mn: PMMA decreases monotonously with the increase in Mn concentration. Optical properties of InSb–Mn: PMMA, such as the optical absorption coefficient and optical conductivity, are greater than those of pure InSb. InSb–Mn: PMMA alloy is doped with PMMA polymer in order to make a thin film as PMMA is a transparent thermoplastic polymer. These results suggest a promising application of InSb–Mn: PMMA thin film in optoelectronics when the InSb doping is 24% with improved conductivity when compared with other doping ratios. This states the optimum doping ratio and the major finding in the carried out research based on modelling and simulation.

Study of PVDF/ (Co-ZnFe2O4 and Cu-ZnFe2O4) nanocomposite for the piezo-phototronics applications

Polyvinylidene fluoride (PVDF) polymer is considered as a promising piezoelectric material whose optical properties need to be improved. Zinc ferrite is an excellent photoelectric material, in the present work it was doped separately by both cobalt and copper. Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles were synthesized and characterized to be used as PVDF fillers, aiming to improve its optical properties. The optical properties as well as, the piezoelectric response of the prepared PVDF/ (Co-ZnFe2O4 and Cu-ZnFe2O4) nanocomposites were investigated. A remarkable improvement in the PVDF relative permittivity, optical conductivity, refractive index, non-linear susceptibility, and a great reduction in the band gap energy value is obtained by adding Co-ZnFe2O4 nanoparticles to it. However, Cu-ZnFe2O4 nanoparticles have limited improvement of the PVDF optical properties compared to the Co-ZnFe2O4 nanoparticles. The piezoelectric response of the PVDF polymer is clearly increased by the addition of both Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles.

Anisotropic Kubo conductivity of electric field-induced monolayer β12-borophene

The optical conductivity of β12-borophene for polarized light along x direction is studied.