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Growth of Silver Cluster on Si(111) 7×7 Reconstructed Surface —— a Scanning Tunneling Microscopy Study
Author(s): 
Pages: 11-14
Year: Issue:  6
Journal: Vacuum Science and Technology

Keyword:  Si(111)7×7重构表面 Ag粒子 扫描隧道显微镜(STM) 覆盖度;
Abstract: 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。
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