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    • 8. 发明授权
    • Method of forming reproducible impurity zone of gallium or aluminum in a
wafer by implanting through composite layers and diffusion annealing
    • 通过植入复合层和扩散退火在晶片中形成镓或铝的可再现杂质区的方法
    • US4426234A
    • 1984-01-17
    • US327190
    • 1981-12-03
    • Jiro OhshimaYutaka KoshinoTakashi AjimaToshio Yonezawa
    • Jiro OhshimaYutaka KoshinoTakashi AjimaToshio Yonezawa
    • H01L21/225H01L21/265H01L21/3115H01L21/425H01L21/74
    • H01L21/31155H01L21/2255H01L21/265
    • The invention discloses a method for fabricating a semiconductor device comprising the steps of: forming, on an entire surface of a semiconductor substrate of one conductivity type, a first thin film of a diffusion coefficient greater than a diffusion coefficient of the substrate; forming, on an entire surface of the first thin film, a second thin film having a diffusion coefficient smaller than the diffusion coefficient of the first thin film; ion-implanting an impurity through the second thin film into the first thin film to form an impurity region, said impurity having a conductivity type opposite to the conductivity type of the substrate; and effecting annealing to set a junction depth of the impurity region to a predetermined value. According to the method of the invention, an impurity region having a desired sheet resistivity and a desired diffusion depth can be formed in the semiconductor substrate with excellent reproducibility and control. The formation of the lattice defect can be prevented and the carrier life time can be improved. Gallium is preferably used as the impurity according to the invention.
    • 本发明公开了一种制造半导体器件的方法,包括以下步骤:在一个导电类型的半导体衬底的整个表面上形成大于衬底扩散系数的扩散系数的第一薄膜; 在所述第一薄膜的整个表面上形成扩散系数小于所述第一薄膜的扩散系数的第二薄膜; 将杂质通过第二薄膜离子注入到第一薄膜中以形成杂质区,所述杂质具有与衬底的导电类型相反的导电类型; 并进行退火以将杂质区域的结深度设定为预定值。 根据本发明的方法,可以在半导体衬底中形成具有期望的电阻率和期望的扩散深度的杂质区,具有优异的再现性和控制性。 可以防止晶格缺陷的形成,并且可以提高载体寿命。 优选使用镓作为本发明的杂质。