摘要
利用同步辐射光电发射谱研究了Co 与CH3CSNH2 处理的S钝化GaAs(100) 的界面形成.发现其界面反应较弱,Co 覆盖层达到0-8 nm 时,形成稳定的界面.GaAs 表面上和S原子形成桥键的Ga 原子与Co 发生交换反应并扩散到覆盖层中,形成Co—S键.Co 覆盖层表面无偏析As 的出现,与Co/GaAs(100) 界面不同,这表明GaAs 表面的S钝化可有效地阻止As
Interface formation between Co and the sulfur\|passivated GaAs(100) (by CH\-3CSNH\-2 treatment) has been studied by synchrotron radiation photoemission spectroscopy.Interface reaction is weak,a stable interface forms at the coverage of 0.8?nm.Ga atoms bonded with S at the surface exchange with Co atoms and cause the formation of Co\|S bonding,no segregated As appears at the surface of Co overlayer,in contrast with the case of Co/GaAs(100).This indicates that S\|passivation on GaAs(100) is an effective way of inhibiting the interdiffusiion of As and Ga through the coverage.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期142-145,共4页
Acta Physica Sinica
基金
国家自然科学基金