TAILIEUCHUNG - A first principles study on electronic and magnetic properties of defects in ZnO/GaN core-shell nanowire heterostructures

In our study we focused on the effects of GaN/ZnO interfaces on the electronic and magnetic properties, . interface states within the bandgap and interface-induced ferromagnetism and impact of surface reconstruction and quantum confinement. The origin of this d0 -FM is revealed by analyses of spin-polarized bandstructure indicated by the asymmetrical spin-up and spindown states near the Fermi level, the projected densities of states (PDOSs) and the spin-polarized mulliken charge differences, indicated that most spin-polarized states are dominated by the interface defect site Np electrons. | Communications in Physics, Vol. 24, No. 3S1 (2014), pp. 127-135 DOI: A FIRST PRINCIPLES STUDY ON ELECTRONIC AND MAGNETIC PROPERTIES OF DEFECTS IN ZnO/GaN CORE-SHELL NANOWIRE HETEROSTRUCTURES LE THI HONG LIEN, VU NGOC TUOC, NGUYEN VIET MINH Institute of Engineering Physics, Hanoi University of Science and Technology TRAN DOAN HUAN Institute of Engineering Physics, Hanoi University of Science and Technology and Institute of Materials Science, University of Connecticut, CT 06269-3136, USA E-mail: Received 20 June 2014 Accepted for publication 20 August 2014 Abstract. To date semiconductor nanowire (NW) heterostructures (HS) have attracted extensive attention as important components of electronic and optoelectronic nanodevices. Further NWs also show promising potency to enhance the solar energy harvesting, . improving both light trapping, photo-carrier collection, and contacting surface area. In this work we show theoretically that the d 0 -ferromagnetism and NW HS bandgap can be turned by engineering the HS interfaces in non-magnetic ZnO/GaN core/shell NW HS. In that NW HS the incorporation of one compound into the other leads to the bandgap narrowing in the nonisovalent alloy because of the type II band alignment betwwen ZnO and GaN. The d 0 -ferromagnetic interface can be developed by creating p-type defect with N and/or n-type defect with Zn in Ga–O interface bonds due to the defect-induced polar discontinuity. It’s noted that the GaN/ZnO NW HS itself without defect or with same number defects of both types are not ferromagnetic. So that the induced magnetic moment is suggested to be related to the missing charge introduced at these defects. In our study we focused on the effects of GaN/ZnO interfaces on the electronic and magnetic properties, . interface states within the bandgap and interface-induced ferromagnetism and impact of surface reconstruction and quantum confinement. The origin of this d 0 .

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