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Co:BaTiO₃/Si（100）纳米复合薄膜制备、微结构及其紫外光电子能谱研究

Fabrication, microstructure and UPS spectra of Co: BaTiO₃/Si（100） nano-composite films

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【作者】吴卫东；何英杰；王锋；詹勇军；白黎；巨新；陈正豪；唐永建；孙卫国；潘海斌；

【Author】 Wu Wei-Dong 1)2) He Ying-Jie 1)2) Wang Feng 1)2) Zhan Yong-Jun 2)5) Bai Li 2) Ju Xin 4) Chen Zheng-Hao 2)3) Tang Yong-Jian 2) Sun Wei-Guo 1) Pan Hai-Bin 6) 1)(Institute of Atomic and Molecular, Sichuan University, Chengdu 610064, China)2)(Centre of Laser Fusion Research CAEP, Mianvang 621900, China)3)(Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)4)(Physics Department of Nanjin University, Nanjing 210093, China)5)(Physics and Electric Information college, West China Normal University, Nanchong 637002, China)6)(National Synchrotron Radiation Lab, University of Science and Technology of China, Hefei 230029, China)

【机构】四川大学原子与分子物理研究所；中国工程物理研究院激光聚变研究中心；南京大学物理系；中国科学技术大学国家同步辐射实验室成都610064中国工程物理研究院激光聚变研究中心；绵阳621900；成都610064中国工程物理研究院激光聚变研究中心；绵阳621900西华师范大学物理与电子信息学院；南充637002；南京210093；绵阳621900中国科学院物理研究所；北京100080；成都610064；合肥230029；

【摘要】采用脉冲激光气相沉积(PLD)方法,在Si(100)晶面上制备了Co:BaTiO3纳米复合薄膜.采用X射线衍射(XRD)结合透射电镜(TEM)方法研究了两种厚度Co:BaTiO3纳米复合薄膜的晶体结构,当薄膜厚度约为30nm时,薄膜为单一择优取向;当薄膜厚度约为100nm时,薄膜呈多晶结构.原子力显微镜(AFM)分析表明,当膜厚为30nm时,薄膜呈现明显的方形晶粒.采用紫外光电子能谱(UPS)研究了Co的价态和Co:BaTiO3纳米复合薄膜的价带谱.研究表明:当Co浓度很高时其态密度(DOS)与晶体BaTiO3明显不同.此外,嵌埋纳米Co颗粒的BaTiO3薄膜的能带结构可用纳米颗粒的浓度来调制,从而也可对其光学和电学性质进行改性.更多还原

【Abstract】 Co: BaTiO₃ nano-composite films were successfully fabricated by pulsed laser deposition on single crystal Si（100） surface. The micro-structure of the Co: BaTiO₃ nano-composite films with about 30 nm and 100 nm thicknesses were studied by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The Co: BaTiO₃ nano-composition films with the above thicknesses were unidirectionally prefer-oriented and polycrystalline, respectively. The atomic force microscopic （AFM） analysis indicated that there were tetragonal crystal grains in the films of about 30 nm thickness. The valence band of the films were investigated by ultraviolet photoelectron spectroscopy （UPS） in detail. The UPS spectra showed that density of electronic states （DOS） of the films with high concentration of Co grains were obviously different from that of bulk BaTiO₃ single crystal.更多还原