Temperature dependence of surface and structure properties of ZnCdO film

doi:10.1088/1674-1056/23/12/126104

Abstract Zn_1-xCd_xO films are grown on c-sapphire substrates by laser molecular beam epitaxy (LMBE) at different temperatures. Their crystallographic structures, compositions, surface electronic structures are investigated. The a-axis lattice constant of Zn_0.95Cd_0.05O is 3.20 Å. Moreover, the epitaxial relationship shows a 30°-in-plane rotation of the film with respect to the c-sapphire substrate. When the substrate temperatures arrives at 500 ℃, the in situ reflection high-energy electron diffraction (RHEED) pattern of ZnCdO film shows sharp streaky pattern. The maximum Cd content of ZnCdO film grown at low substrate temperatures increases up to about 29.6 at.%, which is close to that of the ceramic target. In situ ultraviolet photoelectron spectroscopy (UPS) measurements demonstrate that ZnCdO film exhibits intense peaks at 4.7 eV and 10.7 eV below the Fermi level, which are assigned to the O 2p and Zn 3p states. Energetic distance between Zn 3d and Cd 4d is 0.60 eV. Above 470 nm, the thin film shows excellent optical transmission.

Keywords: surface structure ZnCdO films laser molecular beam epitaxy

Received: 19 March 2014
Revised: 18 June 2014
Accepted manuscript online:

PACS:	61.66.Dk	(Alloys )
	79.20.Ds	(Laser-beam impact phenomena)

Fund: Project supported by the Special Funds from the Ministry of National Science and Technology Major Instrumentation, China (Grant No. 2011YQ130018), the Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, China Academy of Engineering Physics (Grant No. 12zxjk06), and the National High Technology Research and Development Program of China (863 Program).

Corresponding Authors: Zhao Yan
E-mail: zhaoyan-8@caep.ac.cn

Cite this article:

Lei Hong-Wen (雷红文), Yan Da-Wei (阎大伟), Zhang Hong (张红), Wang Xue-Min (王雪敏), Yao Gang (姚刚), Wu Wei-Dong (吴卫东), Zhao Yan (赵妍) Temperature dependence of surface and structure properties of ZnCdO film 2014 Chin. Phys. B 23 126104


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