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    • 6. 发明授权
    • Method for manufacturing high-breakdown voltage semiconductor device
    • 高耐压半导体器件的制造方法
    • US4780426A
    • 1988-10-25
    • US101026
    • 1987-09-24
    • Yutaka KoshinoYoshiro BabaJiro Ohshima
    • Yutaka KoshinoYoshiro BabaJiro Ohshima
    • H01L21/033H01L21/22H01L21/225H01L21/331H01L29/06H01L29/10H01L29/73H01L21/385H01L21/425
    • H01L29/6625H01L21/033H01L21/22H01L21/2253H01L29/0615H01L29/1004
    • A first silicon oxide film is formed on the major surface of an n-type silicon substrate. A silicon nitride film is formed on the first silicon oxide film. The first silicon oxide film and the silicon nitride film are selectively etched to form an opening. Boron ions are implanted into the silicon substrate using the first silicon oxide film and the silicon nitride film as a mask. A second silicon oxide film is formed on the silicon substrate exposed by the opening. Gallium ions are implanted into the second silicon oxide film using the silicon nitride film as a mask. Boron and gallium ions are simultaneously diffused in the silicon substrate. In this case, a diffusion rate of gallium in the silicon substrate is higher than that of boron in the silicon substrate, and the diffusion rate of gallium in the silicon oxide film is higher than that in the silicon substrate. Therefore, a p-type second layer is formed in the substrate to surround a p.sup.+ -type first layer in a self-aligned manner.
    • 在n型硅衬底的主表面上形成第一氧化硅膜。 在第一氧化硅膜上形成氮化硅膜。 选择性地蚀刻第一氧化硅膜和氮化硅膜以形成开口。 使用第一氧化硅膜和氮化硅膜作为掩模将硼离子注入到硅衬底中。 在由开口暴露的硅衬底上形成第二氧化硅膜。 使用氮化硅膜作为掩模将镓离子注入到第二氧化硅膜中。 硼和镓离子同时扩散到硅衬底中。 在这种情况下,硅衬底中镓的扩散速率高于硅衬底中的硼的扩散速率,并且硅氧化膜中镓的扩散速率高于硅衬底中的扩散速率。 因此,在衬底中形成p型第二层,以自对准的方式包围p +型第一层。
    • 7. 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。