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Spatially-Resolved Study of Magnetic Properties of Mn-Doped ZnO Quantum Wires
Gennady Panin,Andrey Baranov,Hyun Jeong Kim,Seung Ki Min,강태원 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
ZnO nanowires prepared by thermal growth following direct chemical synthesis and doped by Mn and by Mn and Sn impurities were investigated. The nanowires show a single crystal structure and a strong blue shift of the near band edge luminescence, which is attributed to the quantum confinement effect. The magnetic susceptibility of the quantum wires as a function of temperature demonstrated a Curie-Weiss behavior. Hysteresis with a coercive field $<$200 Oe was clearly observed in the magnetization versus field curves at 300 K. Increasing the Mn concentration by Mn and Sn co-doping significantly increased the magnetic hysteresis and the ferromagnetic behavior of the nanowires. Magnetic force microscopy measurements with high spatial resolution revealed a magnetic domain structure in the individual wires. The magnetic domains align perpendicular to the surface and can be controlled by using an external magnetic field.
Self-Assembled GaN Quantum Dots in GaN/AlxGa1-xN Structures Grown by PAMBE
G. Panin,강왕,M. Bao,김태환,강태원,박영신 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
High-resolution scanning electron microscopy (HRSEM), cathodoluminescence (CL) and electron beam induced current (EBIC) techniques were used to investigate the structural, optical and electrical properties of GaN/AlxGa1
Spatially Resolved Study of Luminescent and Electrical Properties of ZnO/GaAs Structures
G. N. Panin,M. S. Jang,강태원 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
High-resolution scanning electron microscopy (HRSEM) and cathodoluminescence (CL) spectroscopy measurements were performed to study of ZnO/GaAs structures fabricated by sputtering of ZnO films on a GaAs substrate. Self-doping effect of the structures as a result of the post-growth annealing is investigated. The annealed ZnO films show the well-oriented columnar structure and strong exciton emission at room temperature. Out-diffusion of gallium and arsenic from substrate into a ZnO film has been found to result in the different dopant contrast, measured by a through-the lens secondary electron (TTLSE) technique. Extended structural defects in ZnO assist Ga out-diffusion and show an enhanced electron conductivity after annealing, while As self-doped ZnO region with 120 nm width adjacent to the ZnO/GaAs interface indicates p-type conductivity and the enhanced luminescence associated with donor-acceptor pairs and exciton bound to acceptors.
Luminescent Properties of ZnO/MgO Nanocrystal/Polymer Composite Structure
Gennady N. Panin,Andrey N. Baranov,Irina A. Khotina,Tae W. Kang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report on cathodoluminescence (CL) studies of the composite nanostructure obtained by spin coating of a mixture of chemically-deposited ZnO/MgO nanocrystals and a solution processable polymer (PDPV) on a Si substrate with patterned gold electrodes. The effect of an electric field on the CL of the nanostructure was studied at various bias voltages on the electrodes. A positive voltage suppressed the blue-green emission and shifted the emission maximum to the red region. The emission maximum returned to the blue-green region after the eld had been turned off. A model of the electric-field-induced color switching in the ZnO/polymer-based nanostructure is proposed. The bias-voltage-induced interface band bending and the deactivation of the radiative centers, in particular, singly-ionized oxygen vacancies in ZnO nanocrystals, are suggested to govern the relative changes of the blue-green-red emissions. We report on cathodoluminescence (CL) studies of the composite nanostructure obtained by spin coating of a mixture of chemically-deposited ZnO/MgO nanocrystals and a solution processable polymer (PDPV) on a Si substrate with patterned gold electrodes. The effect of an electric field on the CL of the nanostructure was studied at various bias voltages on the electrodes. A positive voltage suppressed the blue-green emission and shifted the emission maximum to the red region. The emission maximum returned to the blue-green region after the eld had been turned off. A model of the electric-field-induced color switching in the ZnO/polymer-based nanostructure is proposed. The bias-voltage-induced interface band bending and the deactivation of the radiative centers, in particular, singly-ionized oxygen vacancies in ZnO nanocrystals, are suggested to govern the relative changes of the blue-green-red emissions.
Luminescence from ZnO/MgO nanoparticle structures prepared by solution techniques
G.N.Panin,A.N.Baranov,오영제,강태원 한국물리학회 2004 Current Applied Physics Vol.4 No.6
The optical and structural properties of mixed ZnO/MgO particles prepared by solution techniques are investigated by thecathodoluminescence and electron microscopy techniques. The samples annealed at 4001000.C show well crystalline wurtzitestructure of the ZnO (MgZnO) particles with the size in range of 10100 nm. Annealing at high temperatures (>700.C) leads to Mgdiusion in ZnO and MgxZn1. xO alloy formation. The blue shifts of the near-band-edge emission as a result of the alloy band gapwidening and quantum connement eect for the small size particles are demonstrated.