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    • 7. 发明授权
    • Method for manufacturing semiconductor device
    • 制造半导体器件的方法
    • US06713403B2
    • 2004-03-30
    • US10384562
    • 2003-03-11
    • Junji OoharaKazuhiko KanoHiroshi Muto
    • Junji OoharaKazuhiko KanoHiroshi Muto
    • H01L2100
    • B81C1/0019B81C1/00579B81C1/00626B81C2201/0132G01P15/0802G01P15/125G01P2015/0814
    • A method for manufacturing a semiconductor device having a movable unit includes a step of forming an SOI substrate that includes a semiconductor substrate, an insulating layer, and a semiconductor layer. The method further includes a step of dry etching the semiconductor layer to form a trench and a step of dry etching a sidewall defining the trench at a portion adjacent to a bottom of the trench to form the movable unit. The later dry etching is implemented with a charge building up on a surface of the insulating layer that is exposed during the former dry etching to etch the portion. In addition, the later dry etching is implemented at an etching rate higher than that at which the former dry etching is implemented to reduce the deposition amount of a protection film deposited on a reverse side of the movable unit during the later dry etching.
    • 一种制造具有可移动单元的半导体器件的方法包括形成包括半导体衬底,绝缘层和半导体层的SOI衬底的步骤。 该方法还包括干法蚀刻半导体层以形成沟槽的步骤,以及在邻近沟槽底部的部分干蚀刻限定沟槽的侧壁以形成可移动单元的步骤。 稍后的干蚀刻通过在前一次干蚀刻中暴露的绝缘层的表面上积累的电荷来实现,以蚀刻该部分。 此外,稍后的干蚀刻以比实施前述干蚀刻的蚀刻速率更高的蚀刻速率来实现,以减少在稍后的干蚀刻期间沉积在可移动单元的反面上的保护膜的沉积量。