机构地区: 汕头大学理学院物理系
出 处: 《汕头大学学报(自然科学版)》 2004年第4期14-18,共5页
摘 要: 以SiCl4 和H2 为气源 ,用等离子体增强化学气相沉积技术 ,以 3 5 s的速率生长出了晶化度为 75 %的优质多晶硅薄膜 .着重分析放电功率的影响 ,结果表明 :随着功率的增大 ,薄膜沉积速率基本上线性增大 ,之后有减小的趋势 ;薄膜晶化度随功率的增大而减小 ;功率较大时 ,晶粒密度也大 ,且比较均匀 ,但晶粒尺寸较小 ,功率较小时 ,大尺寸的晶粒明显增多 。 High quality polycrystalline silicon films were directly fabricated from SiCl 4_H 2 mixture gases by plasma chemical vapor deposition technique with deposition rate and crystalline fraction of 3.5/s and 75%,respectively.We focus on the analysis of affectation of discharge power to compositions,deposition rate,the size of crystalline grain,and crystalline fraction of polycrystalline silicon film. As a result,deposition increases linearly with increase of rf power,while decreases slightly from 140 W;crystalline fraction decreases with increase of rf power;the size of crystalline grain is small under high rf power,while the number of large crystalline grain increases and there are more small grains under lower power.