摘要
本文着重研究ZnO薄膜在MgO(011)衬底上的生长行为。利用分子束外延法(MBE)在MgO(110)衬底上生长ZnO薄膜,通过原子力显微镜(AFM)和扫描电子显微镜(SEM)表征了其表面形貌,利用X射线光电子能谱学(XPS)对薄膜的组分进行深度分层剥析,并采用透射谱(XL)研究了其光学性质。结果显示,薄膜以三维模式生长,而且薄膜表面平整度受到衬底温度的影响;而所生长的薄膜均显示了ZnO透射谱的特征峰,特征峰的位置几乎不受衬底温度的影响。不同生长时间段的薄膜结构的演变过程也通过原位的反射高能电子衍射(RHEED)和原子力显微镜进行了考察。XPS分层组分分析发现,在ZnO薄膜生长过程中,Zn离子会扩散到MgO(110)衬底之中。
In this work, the growth behaviors of ZnO thin films on MgO (011) substrates were studied. ZnO films were deposited on MgO(110) substrates using oxygen plasma-assisted molecular beam epitaxy (MBE). Their surface mor- phologies were probed by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Elemental con- stituents at different depths were also analyzed by X-ray photoelectron spectroscopy (XPS) and the optical properties of the ZnO films were characterized by transmission spectra. The film growth was found to follow a three-dimensional growth mode and the surface morphologies could be monitored by substrate temperature. The characteristic band gap of ZnO was found for all the films and the value was little influenced by the substrate temperature. In addition, the evolu- tion of the structure was examined by capturing in situ reflection high-energy electron diffraction (RHEED) patterns and ex situ AFM for different growth steps. During the growth of ZnO films, the Zn ions were found to diffuse into the MgO(110) substrate.
出处
《现代物理》
2013年第3期79-83,共5页
Modern Physics
基金
国家自然科学基金(编号11204253)
教育部博士点基金(编号20100121120026)
厦门大学基础创新科研基金(中央高校基本科研业务费专项资金)(编号CXB2011029)的资助。
