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利用超高真空扫描隧道显微镜 (UHVSTM)研究了室温条件下沉积在Si(111) 7× 7重构表面不同覆盖度的Ag粒子。实验结果表明 ,低覆盖度时的Ag粒子主要有A、B两种类型 ,其中A型Ag粒子呈环状结构 ,最小的A型Ag粒子由 3个Ag原子组成 ;而B型Ag粒子则是由两层Ag原子构成。高覆盖度时Ag粒子的生长过程为层岛混合生长 (Stranski Krastanov)模式。本文还研究了不同蒸发速率对Ag原子成核的影响 ,发现在高蒸发速率条件下Ag原子在Si(111) 7× 7重构表面更容易成核。
The Ag particles deposited on Si (111) 7 × 7 reconstructed surface under room temperature were studied by using ultra-high vacuum scanning tunneling microscope (UHVSTM). The experimental results show that there are mainly two types of Ag particles with low coverage, that is, type A Ag particles have a ring structure, the smallest type A Ag particles consist of three Ag atoms, and the type B Ag particles are Consists of two layers of Ag atoms. The growth of Ag particles at high coverage is in Stranski Krastanov mode. The effect of different evaporation rates on nucleation of Ag atoms was also studied. It is found that Ag atoms nucleate more easily at the Si (111) 7 × 7 surface at high evaporation rates.