Giant increase of optical transparency for Zn-rich CaxZn 1− xO on Al 2 O 3 (0001) grown by pulsed laser deposition
Fedorchuk, HA Albrithen, AM El-Naggar, K Ozga, H Alshahrani, A Alanazi, E Alfaifi, J Labis, A Alyamani, A Albadri, MH Alkahtani, ZA Alahmed, J Jedryka, AO . 2016
In this study, CaxZn1−xO high quality films with different Ca ratios (from 0% to 10%) were grown on Al2O3 (0 0 0 1) substrates by pulsed laser deposition for the first time. The optical properties for the grown films were studied over a wide spectral range from 200 to 3300 nm using the reflectance and transmittance spectrum. It was found that the calculated optical energy gap values increases from 3.275 to about 3.340 eV with increasing Ca concentrations from 0% to 10%. This opens a new stage in the study of the high quality optical films. The stoichiometry of the films was achieved using targets of the same intended film ratio. Two sample sets were grown at 650 °C, one set with argon gas background at 10 mTorr and the other one without any intentionally introduced gases. The structural properties for the grown films were studied using X-ray Diffraction. It was clear that by increasing Ca, the lattice parameter c is decreased and 2θ was shifted towards higher values from, while the FWHM was increased. These results indicated that the film crystallinity degrades as Ca content in the films increased.
The structural, electronic, and optical properties of inorganic CsPb (I 1− x Br x) 3 compounds were investigated using the full-potential linear augmented-plane wave (FP-LAPW) scheme with a…
Cesium lead bromide (CsPbBr3) perovskite has recently gained significance owing to its rapidly increasing performance when used for light-emitting devices.
The structural, electronic, and optical features of CsPb(I1-xBrx)3 (x = 0, 0.25, 0.50, 0.75, and 1.0) compounds were evaluated using first-principles calculations based on the full-potential…