Institution: | a Microelectronics Laboratories, NEC Corporation, 4-1-1, Miyazakidai, Miyamaeku, Kawasaki, Kanagawa 213, Japan b ANELVA Corporation, 5-8-1, Yotsuya, Fuchu, Tokyo 183, Japan |
Abstract: | The conditions under which selective epitaxial growth (SEG) is achieved in UHV-CVD with Si2H6 are determined by the amount of Si2H6 molecules being supplied, and there is a critical gas supply amount (Fc) beyond which SEG will break down and lose its selectivity. The value of Fc is itself determined by two factors, growth temperature and the material used for masking, i.e. SiO2, Si3N4. We found that this limiting factor of Fc was increased through the addition of a small amount of Cl2, and that after such addition, the resulting decrease in growth rate is minimal. |