Optical Properties of Co:ZnO Nanowires

• Main Authors: Chung-Yi Lin, 林忠儀
• Other Authors: Kien-Wen Sun
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/36028396469496780132

碩士 === 國立交通大學 === 分子科學研究所 === 96 === Diluted magnetic semiconductor is a very good material in making spintronics. Because they can be ferromagnetic with very low magnetic impurity concentrations in nonmagnetic semiconductors. Magnetic represents spin of unpair electron. When doping magnetic impurity in semiconductors, they can be applied in semiconductor technology widely. Cobalt doped zinc oxide has excellent properties of wide energy band gap and large exciton binding energy. The excellent optical and electronic properties make it a new material for optoelectronic devices in future. This thesis will introduce how to make use of a series of technology to investigate the optical properties of cobalt doped zinc oxide nanowires. The technology includes using photoluminescence(PL) and magneto-photoluminescence (MPL) spectroscopy of nanowires by using Confocal microscope and dilution function. From those information we can know the optical and lattice vibration properties. The doped zinc oxide shows good lattice period as the bulk zinc oxide. We also measure the temperature dependence of PL. The MPL were measured with a Low Temperature High Magnetic Optics System to get the MPL at low temperature. The PL intensity decreased with increasing magnetic intensity. We also observed diamagnetic shift at different magnetic field. These information were used to deduce the exciton radius of material.