Comparative energy bandgap analysis of zinc and tin based chalcogenide quantum dots

Abstract

Semiconductors with wide bandgap are crucial for optoelectronic devices and energy applications owing to their electron confinement, high optical transparency and tunable electrical conductivity. Therefore, in this study, the quantum confinement effect of the energy bandgap of chalcogenide semiconductor nanocrystals such as ZnS, ZnSe, ZnTe, SnS, SnSe and SnTe are studied based on the Brus model using the effective mass approximation, the hyperbolic band model and the cohesive energy model. The obtained results indicate that the value of energy bandgap differs from the bulk crystals related to the quantum confinement effect. These verdicts confirm the quantum confinement effects of materials and their potential applications in optoelectronic devices. Theoretical findings are compared with its valid experimental data.

Effects of Quantum Confinement Energy on the Transmittance of Cadmium Telluride (CdTe) Within the Near Infrared Region (700-2500nm)

“…The process of trapping charge carriers in quantum dots leads to volume quantization, and this has important implications for the absorption and emission spectra that shift to short a wavelength as the size of the quantum dot decreases, this means that large quantum dots produce red a light while small quantum dots produce blue light thus the energy gap is tunable by changing the size of the quantum dots (QDs) based on the quantum confinement effect [9]. The equation for the quantum confinement energy for the ground state of quantum dots is given [10]:…”

Free Space Laser Communication Using Modern Laser Diodes

“…Although this field is primarily focused on NASA applications, advances in laser communications may find their way into commercial and Department of Defense applications in the future. Overall, laser communications are an untapped advance with great potential to transform space and communications to date [1][2][3][4][5][6] Due to the increase in communication speed, it is called the era of modern long distance communication. , High data transmission rate, security, antiinterference effect, unregulated frequency, etc., Laser communication is much better.…”