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	Investigation of growth mode in ZnO thin films prepared at different temperature by plasma-molecular beam epitaxy (EI CONFERENCE) 会议论文 OAI收割 13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004, 13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004 Liang H. W.; Lu Y. M.; Shen D. Z.; Yan J. F.; Li B. H.; Zhang J. Y.; Liu Y. C.; Fan X. W. 收藏 \| 浏览/下载：35/0 \| 提交时间：2013/03/25 High-quality ZnO thin films on c-plane sapphire (Al2O 3) substrates were prepared by plasma-molecular beam epitaxy (P-MBE). The influence of growth temperature on growth mode of ZnO was investigated. Real-time monitored by reflection high-energy electron diffraction (RHEED) images show that below 500 C ZnO thin film was grown by three-dimension (3D) growth mode. While the two-dimension (2D) growth mode was obtained above growth temperature of 650 C. Atomic force microscopy (AFM) images present that the surface morphology of ZnO thin film with 2D growth is improved and X-ray rocking curves (XRC) indicate that the full width at half maximum (FWHM) of the ZnO (0 0 2) peak becomes narrow. From the photoluminescence (PL) spectra ultraviolet (UV) emission peak exhibits obvious blue-shift for the samples grown at lower temperature which is attributed to the effect of the quantum confinement arisen from small crystal grain sizes. The minimum carrier concentration of N=7.661016 cm-3 was obtained in the ZnO thin films with the 2D grown which is closed to that of bulk ZnO. 2005 Elsevier B.V. All rights reserved.
	Characterization of ZnO/Mg0.12Zn0.88O heterostructure grown by plasma-assisted molecular beam epitaxy (EI CONFERENCE) 会议论文 OAI收割 13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004, 13th International Conference on Molecular Beam Epitaxy, August 22, 2004 - August 27, 2004 Lu Y. M.; Wu C. X.; Wei Z. P.; Zhang Z. Z.; Zhao D. X.; Zhang J. Y.; Liu Y. C.; Shen D. Z.; Fan X. W. 收藏 \| 浏览/下载：28/0 \| 提交时间：2013/03/25 In this paper Mg0.12Zn0.88O/ZnO heterostructures were fabricated on c-plane sapphire (Al2O3) substrates by plasma-assisted molecular beam epitaxy (P-MBE). The quality of the Mg 0.12Zn0.88O alloy thin film was characterized by X-ray diffraction (XRD) and reflection high-energy electron diffraction (RHEED). Optical properties of the Mg0.12Zn0.88O/ZnO heterostructure were studied by absorption and photoluminescence (PL) spectra. At room temperature (RT) Mg0.12Zn0.88O/ZnO heterostructures show two absorption edges originating from ZnO and Mg 0.12Zn0.88O layers respectively. In PL spectra two ultraviolet emission bands related to the ZnO layer and the Mg 0.12Zn0.88O layer were observed. The emission band from Mg0.12Zn0.88O layer dominates at moderately lower temperature and the luminescence of ZnO becomes gradually important with increasing temperature. This is suggested to exist as a potential barrier in the interface and to restrict the relaxation of the carriers from the Mg 0.12Zn0.88O layer to ZnO layer. As the thickness of ZnO layer decreases the emission from the Mg0.12Zn0.88O layer becomes weaker and weaker. When the ZnO thickness is up to 2 nm only the luminescence of the ZnO layer is observed at RT. The quenching of the emission corresponding to the MgZnO layer indicates the existence of a strong injection process in the samples with thinner ZnO layer. 2005 Elsevier B.V. All rights reserved.
	Microstructure of GaN films grown on Si(111) substrates by metalorganic chemical vapor deposition 期刊论文 OAI收割 JOURNAL OF CRYSTAL GROWTH, 2003, 卷号: 256, 期号: 3-4, 页码: 416 Hu, GQ; Kong, X; Wan, L; Wang, YQ; Duan, XF; Lu, Y; Liu, XL 收藏 \| 浏览/下载：21/0 \| 提交时间：2013/09/18 MOLECULAR-BEAM EPITAXY HIGH-QUALITY GAN HETEROEPITAXIAL GROWTH ELECTRON-DIFFRACTION DEFECT STRUCTURE HETEROSTRUCTURE DISLOCATIONS MICROSCOPY (111)SI LAYER
	Microstructure of GaN films grown on Si(111) substrates by metalorganic chemical vapor deposition 期刊论文 OAI收割 journal of crystal growth, 2003, 卷号: 256, 期号: 3-4, 页码: 416-423 Hu GQ; Kong X; Wan L; Wang YQ; Duan XF; Lu Y; Liu XL 收藏 \| 浏览/下载：38/0 \| 提交时间：2010/08/12 amorphous layer dislocation transmission electron microscopy metalorganic chemical vapor deposition GaN MOLECULAR-BEAM EPITAXY HIGH-QUALITY GAN HETEROEPITAXIAL GROWTH ELECTRON-DIFFRACTION DEFECT STRUCTURE HETEROSTRUCTURE DISLOCATIONS MICROSCOPY (111)SI LAYER
	超强超短激光驱动的尾波场电子加速及新型辐射源研究学位论文 OAI收割作者: 余昌海 \| 收藏 \| 浏览/下载：60/0 \| 提交时间：2018/12/26 超强超短激光 ultra-intense ultra-short laser pulse 激光级联尾波场加速 laser cascaded wakefield acceleration 能量啁啾控制 energy chirp control 高品质电子束 high-quality electron beam Compton散射 Compton scattering 等离子体摇摆器 plasma wiggler betatron辐射 betatron radiation 等离子体通道 plasma channel 打洞效应 hole boring