Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO_3(110) substrates  

作　　者：白洪亮 刘国磊 贺树敏 颜世申 朱大鹏 郭红雨 冀子武 杨丰帆 陈延学 梅良模 

机构地区：[1]School of Physics and National Key Laboratory of Crystal Materials,Shandong University

出　　处：《Chinese Physics B》2012年第5期631-635,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant No. 2009CB929202);the National Natural ScienceFoundation of China (Grant Nos. 10834001 and 51125004)

摘　　要：ZnO thin film growth prefers different orientations on the etched and unetched SrTiO 3（STO）（110） substrates.Inclined ZnO and cobalt-doped ZnO（ZnCoO） thin films are grown on unetched STO（110） substrates using oxygen plasma assisted molecular beam epitaxy,with the c-axis 42 inclined from the normal STO（110） surface.The growth geometries are ZnCoO[100]//STO[110] and ZnCoO[111]//STO[001].The low temperature photoluminescence spectra of the inclined ZnO and ZnCoO films are dominated by D 0 X emissions associated with A 0 X emissions,and the characteristic emissions for the 2 E（2G）→ 4A2（4F） transition of Co 2＋ dopants and the relevant phonon-participated emissions are observed in the ZnCoO film,indicating the incorporation of Co 2＋ ions at the lattice positions of the Zn 2＋ ions.The c-axis inclined ZnCoO film shows ferromagnetic properties at room temperature.ZnO thin film growth prefers different orientations on the etched and unetched SrTiO 3（STO）（110） substrates.Inclined ZnO and cobalt-doped ZnO（ZnCoO） thin films are grown on unetched STO（110） substrates using oxygen plasma assisted molecular beam epitaxy,with the c-axis 42 inclined from the normal STO（110） surface.The growth geometries are ZnCoO[100]//STO[110] and ZnCoO[111]//STO[001].The low temperature photoluminescence spectra of the inclined ZnO and ZnCoO films are dominated by D 0 X emissions associated with A 0 X emissions,and the characteristic emissions for the 2 E（2G）→ 4A2（4F） transition of Co 2＋ dopants and the relevant phonon-participated emissions are observed in the ZnCoO film,indicating the incorporation of Co 2＋ ions at the lattice positions of the Zn 2＋ ions.The c-axis inclined ZnCoO film shows ferromagnetic properties at room temperature.

关 键 词：inclined ZnO SrTiO 3（110） PHOTOLUMINESCENCE 

分 类 号：TN304.055[电子电信—物理电子学]