Optimal growth and thermal stability of crystalline Be0.25Zn0.75O alloy films on Al2O3(0001)

被引：10
|
作者：
Park, Dae-Sung [1 ]
Krupski, A. [1 ]
Sanchez, A. M. [1 ]
Choi, Chel-Jong [2 ]
Yi, Min-Su [3 ]
Lee, Hyun-Hwi [4 ]
McMitchell, S. R. C. [1 ]
McConville, C. F. [1 ]
机构：
[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[2] Chonbuk Natl Univ, Sch Semicond & Chem Engn, SPRC, Jeonju 561756, South Korea
[3] Kyungpook Natl Univ, Dept Mat Sci & Engn, Sangju 742711, South Korea
[4] POSTECH, Pohang Accelerator Lab, Pohang 790784, South Korea
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 14期
基金：
英国工程与自然科学研究理事会;
关键词：
OPTICAL-PROPERTIES; GAP; EXCITON; LAYERS; BEZNO;
D O I：
10.1063/1.4870533
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The influence of growth temperature on the synthesis of BexZn1-xO alloy films, grown on highly-mismatched Al2O3(0001) substrates, was studied by synchrotron x-ray scattering, high-resolution transmission electron microscopy and photoluminescence measurements. A single-phase BexZn1-xO alloy with a Be concentration of x = 0.25, was obtained at the growth temperature, T-g = 400 degrees C, and verified by high-resolution transmission electron microscopy. It was found that high-temperature growth, T-g >= 600 degrees C, caused phase separation, resulting in a random distribution of intermixed alloy phases. The inhomogeneity and structural fluctuations observed in the BexZn1-xO films grown at high temperatures are attributed to a variation in Be composition and mosaic distribution via atomic displacement and strain relaxation. (C) 2014 AIP Publishing LLC.
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页数：5
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