Magneto-optical transport properties of the nanostructured transparent conducting oxides

Abstract

A comparative study of the optical absorption properties of the nanostructured transparent conducting oxides (TCOs) such as zinc oxide (ZnO), cadmium oxide (CdO), and gallium oxide (Ga2O3) in the presence of a magnetic field B has been performed. The cyclotron resonance absorption power in the TCO materials of the symmetric Pöschl–Teller quantum well (SPTQW) and the full width at half maximum (FWHM) are obtained by applying the operator projection method, the confined phonon model of Huang–Zhu, and the profile technique. Our main results are as follows: The order of the absorption power intensity in these TCOs from strongest to weakest is Ga2O3, ZnO, and CdO, whereas that of the FWHM from largest to smallest is CdO, ZnO, and Ga2O3. This is because the optical phonon frequency in CdO is the smallest, while that in Ga2O3 is the largest. The influences of the magnetic field strength, the thickness, and the temperature on the FWHM in ZnO, CdO, and Ga2O3 become more significant as the phonon is confined. The optical absorption properties of the TCOs are remarkably enhanced due to the confinement of phonon, and those of CdO are the most dominant among the Ga2O3, ZnO, and CdO. The results of our study can provide particular insights for the design of optoelectronic devices.