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    • 10. 发明授权
    • Impurity diffusion method
    • 杂质扩散法
    • US5387545A
    • 1995-02-07
    • US805969
    • 1991-12-12
    • Yukihiro KiyotaTohru NakamuraTakahiro OnaiTaroh Inada
    • Yukihiro KiyotaTohru NakamuraTakahiro OnaiTaroh Inada
    • H01L21/22C30B31/06H01L21/225H01L21/331H01L29/73H01L21/223
    • H01L29/66272C30B31/06H01L21/2254Y10S148/017
    • An impurity diffusion method which can control a surface atomic concentration from a low to a high surface atomic concentration with a good uniformity is provided. Natural oxide is removed from the surface of a semiconductor substrate with a deoxidizing atmosphere gas as a diffusion atmosphere gas in advance, and then an impurity gas is passed thereto, while passing the deoxidizing atmosphere gas thereto, thereby conducting the diffusion. Flow rate or concentration of impurity of the impurity gas is so set that the impurity atomic concentration of the diffusion layer can be controlled by the flow rate or the concentration of impurity of the impurity gas. The impurity atomic concentration of the diffusion layer can be controlled by adjusting the flow rate or concentration of impurity of the impurity gas, and a diffusion layer having a low impurity atomic concentration can be formed. A shallow junction having a depth of not more than 50 nm can be formed.
    • 提供了能够以均匀性良好地控制表面原子浓度从低到高表面原子浓度的杂质扩散方法。 预先用脱氧气氛气体作为扩散气氛气体从半导体衬底的表面除去天然氧化物,然后在通过脱氧气氛气体的同时通过杂质气体,从而进行扩散。 杂质气体的流量或杂质浓度设定为可以通过杂质气体的流量或杂质浓度来控制扩散层的杂质原子浓度。 扩散层的杂质原子浓度可以通过调节杂质气体的杂质浓度的流量或浓度来进行控制,可以形成杂质原子浓度低的扩散层。 可以形成深度不大于50nm的浅结。