Determination of the Quantum-well Thickness of ZnO-ZnMgO Core-shell Cylindrical Heterostructures by Using Interband Optical Transitions

摘要

ZnO hexagonal core nanorods with an average diameter of 55 nm were initially grown by using the hydrothermal method; then, ZnO-Zn1-xMgxO quantum wells were deposited around the ZnO core nanorods by using the atomic layer deposition technique. To investigate the optical band structures, we measured the photoluminescence transitions of as-grown ZnO nanorods, the ZnO-ZnMgO coreshell and the ZnO-ZnMgO core-shell + quantum wells. To determine the thickness of quantum wells, we attempted to solve the self-consistent nonlinear Poisson-Schr?dinger equation for twodimensional hexagonal quantum-well band structures. Using the experimental and the calculated results, we were able to quantitatively determine the quantum-well thicknesses.