Abstract
ZnO thin films were grown on c-plane sapphire substrate using plasma-assisted molecular beam epitaxy. The thickness of MgO buffer layers was optimized for structural and electrical properties of the epi-ZnO films. It is found that with MgO buffer growth time of 60 s, the epi-ZnO film exhibited narrow X-ray diffraction peak as well as low surface roughness. In the meantime, the electron concentration reached a minimum of 2.03×10 16/cm 3 and high mobility of 169.4 cm 2/V S. These results demonstrate a route to grow good crystals together with excellent mobility and low residual electron concentration, which can ultimately satisfy the requirement for acceptor doping as well as device engineering.
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