,Effect of initial crystallization temperature and surface diffusion on formation of GaAs multiple c

• 作 者: Yi Wang Xiang Guo Jiemin Wei Chen Yang Zijiang Luo Jihong Wang Zhao Ding
• 机 构: College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China“,”Power S
• 出 处: 中国物理B（英文版）
• 发表日期: 2020年4期
• 关键词: concentric nano-ring structures crystallization temperature activation energy of

GaAs multiple concentric nano-ring structures (CNRs) are prepared with multistep crystallization procedures by droplets epitaxy on GaAs (001) to explore the influence of different initial crystallization temperatures on CNRs mor-phology. Atomic force microscope (AFM) images show that GaAs nanostructures are more likely to form elliptical rings due to diffusion anisotropy. Meanwhile, with the increase of initial crystallization temperature, the inner ring height and density of CNRs are increased, and outer rings are harder to form. In addition, the mechanism of formation of CNRs is discussed by classical nucleation theory and diffusion theory. The method can be used to calculate the diffusion activation energy of gallium atoms (0.7±0.1 eV) on the GaAs (001) surface conveniently.