Estimation of Exciton Confinement in III-Nitride Quantum Wires

The optical properties of one dimensional (1D) structures are dominated by the excitonic behaviour which are formed by optical absorption. The excitonic properties in IIInitride based cylindrical quantum wires (QWRs) have been investigated theoretically. The confinement of the electron and the hole is subjected for the peculiarities of the exciton in a QWR where confinement of the particles can be governed through the size and shape of the QWR as well as through the selection of structure and impediment materials to produce various band offsets. In this paper, it has been traced the energy levels and wave functions for confined electrons and holes from numerical solution of Schrodinger-like equations in the effective mass approximation. Finally, the energy of confined exciton have been calculated from the above result. For the different composition in InGaN/GaN, AlGaN/GaN, InAlN/AlN based cylindrical QWRs, the excitonic behaviour have been investigated individually and the combined effects have also been pursued, where considering radius of the wire within the range of 30nm to 70nm.