原位光发射谱研究横向偏压金刚石薄膜生长过程

摘要

The nucleation and growth of diamond film under transverse bias was investigated in a hot-filament chemical vapor deposition system. It was shown that the nucleation density of diamond is enhanced with the increasing of transverse bias current. A nucleation density of 1.1×.10 8cm-2 can be obtained, but transverse bias is harmful to the growth of diamond film.In situ optical emission spectroscopy technology was used to study the diamond film deposition process. The results showed that the improvement of the nucleation density and the harm of the growth may be caused by the abundance of atomic hydrogen and CH radical which is favorable to the formation of thin amorphous carbon layers.%利用热丝CVD方法研究了横向偏压对金刚石薄膜成核和生长的影响．实验表明，随着偏流的增加，金刚石在光滑硅衬底上的成核密度得到显著提高，最高可达1．1×108cm-2，但是横向偏压不利于金刚石薄膜的生长．原位光发射谱研究发现，横向偏流的增加提高了原子氢和CH基团的浓度，导致衬底表面非晶碳层的形成，这可能是造成横向偏压促进金刚石成核却不利于金刚石薄膜生长的主要原因．