采用同位素H216O/H218O接续氧化同位素示踪方法,研究了单晶硅在1100℃水汽中氧化的微观传质机制.在H216O,H218O分别氧化和H216O/H218O接续氧化处理后,研究氧化产物形态和结构.并用二次离子质谱仪(SIMS)研究了同位素16O和18O在氧化膜中浓度分布.结果表明H2O蒸汽中氧化产物为非晶态SiO2.H216O/H218O接续氧化后,16O与18O在氧化膜中呈渐次梯度分布,表明Si在水汽中的氧化传质机制为替位扩散机制.
A new method was proposed to investigate the transport mechanism of silicon oxidation at 1100 ℃ using H2^ 16 O/H2^ 18 O isotopic labeling. The formation and structure of silicon oxide film was analysed. The distribution of ^ 16 O and ^ 18 O in the oxide film was analysed by means of secondary ion mass spectroscopy (SIMS). The results demonstrate that the oxide film is non-crystalline during the oxidation of silicon in the water vapor and the transport mechanism is substitutional diffusion mechanism.