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    • 9. 发明授权
    • SOI device with different crystallographic orientations
    • 具有不同晶体取向的SOI器件
    • US07439559B2
    • 2008-10-21
    • US11469039
    • 2006-08-31
    • Kangguo ChengRamachandra DivakaruniCarl J. Radens
    • Kangguo ChengRamachandra DivakaruniCarl J. Radens
    • H01L29/74
    • H01L29/78642H01L27/10864H01L27/1087
    • A method of forming a memory cell having a trench capacitor and a vertical transistor in a semiconductor substrate includes a step of providing a bonded semiconductor wafer having a lower substrate with an [010] axis parallel to a first wafer axis and an upper semiconductor layer having an [010] axis oriented at forty-five degrees with respect to the wafer axis, the two being connected by a layer of bonding insulator; etching a trench through the upper layer and lower substrate; enlarging the lower portion of the trench and converting the cross section of the upper portion of the trench from octagonal to rectangular, so that sensitivity to alignment errors between the trench lithography and the active area lithography is reduced. An alternative version employs a bonded semiconductor wafer having a lower substrate formed from a (111) crystal structure and the same upper portion. Applications include a vertical transistor that becomes insensitive to misalignment between the trench and the lithographic pattern for the active area, in particular a DRAM cell with a vertical transistor.
    • 在半导体衬底中形成具有沟槽电容器和垂直晶体管的存储单元的方法包括提供具有平行于第一晶片轴的[010]轴的下基板的接合半导体晶片的步骤,以及具有 相对于晶片轴线定向成四十五度的[010]轴,两者通过一层粘合绝缘体连接; 蚀刻通过上层和下衬底的沟槽; 扩大沟槽的下部并将沟槽的上部的横截面从八边形转换为矩形,从而降低对沟槽光刻和有源区光刻之间对准误差的敏感性。 替代方案采用具有由(111)晶体结构和相同上部形成的下基板的键合半导体晶片。 应用包括对于有源区域,特别是具有垂直晶体管的DRAM单元对沟槽和光刻图案之间的未对准变得不敏感的垂直晶体管。