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    • 29. 发明授权
    • Polysilicon undercut process for stack DRAM
    • 堆叠DRAM的多晶硅底切工艺
    • US5374577A
    • 1994-12-20
    • US993625
    • 1992-12-21
    • Hsiao-Chin Tuan
    • Hsiao-Chin Tuan
    • H01L27/04H01L21/02H01L21/822H01L21/8242H01L27/10H01L27/108H01L21/70H01L27/00
    • H01L27/10852H01L28/87
    • A method for fabricating DRAM capacitors is described. Field effect devices are foraged in the silicon substrate. A first oxide layer is formed over the device and field oxide areas. The capacitors are formed by first depositing a heavily doped silicon layer over the device and field oxide areas. Then forming openings to the desired source/drain structures by etching through the silicon layer, and first oxide layers, wherein the opening extends over a portion of the gate electrode polysilicon layer of the gate structure and the field oxide areas. An undoped polysilicon layer is deposited over the openings to the source/drain structures. Patterning anisotropically the silicon and molysilicon layers so as to have their remaining portions over the planned capacitor areas, and wherein a portion of the heavily doped silicon layer remains over both the portion of the polysilicon gate electrode of the gate structure and the field oxide areas. Then completely removing by selective etching the portion of heavily doped silicon layer using phosphoric acid at a temperature greater than 140.degree. C. to create an undercut of the undoped polysilicon layer over both the portion of the polysilicon gate electrode of the gate structure and the field oxide areas and to construct the bottom storage node electrode of the desired capacitor. The capacitor is then completed.
    • 描述了制造DRAM电容器的方法。 场效应器件在硅衬底中被使用。 在器件和场氧化物区域上形成第一氧化物层。 通过首先在器件和场氧化物区域上沉积重掺杂的硅层来形成电容器。 然后通过蚀刻穿过硅层和第一氧化物层形成到期望的源极/漏极结构的开口,其中开口延伸在栅极结构的栅电极多晶硅层的一部分和场氧化物区域上。 未掺杂的多晶硅层沉积在开口上到源/漏结构。 各向异性地形成硅和钼硅层,使其剩余部分在规划的电容器区域上,并且其中重掺杂硅层的一部分保留在栅极结构的多晶硅栅电极的部分和场氧化物区域之上。 然后通过在大于140℃的温度下使用磷酸选择性蚀刻重掺杂硅层的部分来完全去除以在栅极结构的多晶硅栅电极的两个部分上形成未掺杂的多晶硅层的底切, 并构成所需电容器的底部存储节点电极。 然后电容器完成。
    • 30. 发明授权
    • Method for producing a roughened surface capacitor
    • 粗糙表面电容器的制造方法
    • US5266514A
    • 1993-11-30
    • US994501
    • 1992-12-21
    • Hsiao-Chin TuanHsiang-Ming J. Chou
    • Hsiao-Chin TuanHsiang-Ming J. Chou
    • H01L21/02H01L21/306H01L21/8242H01L21/70H01L27/00
    • H01L27/10852H01L21/30604H01L28/84Y10S438/964
    • A new method to produce a microminiturized capacitor having a roughened surface electrode is achieved. The method involves depositing a first polycrystalline or amorphous silicon layer over a suitable insulating base. The silicon layer is either in situ heavily, uniformly doped or deposited undoped and thereafter heavily doped by ion implantation followed by heating. The structure is annealed at above about 875.degree. C. to render any amorphous silicon polycrystalline and to adjust the crystal grain size of the layer. The polysilicon surface is no subjected to a solution of phosphoric acid at a temperature of above about 140.degree. C. to partially etch the surface and cause the uniformly roughened surface. A capacitor dielectric layer is deposited thereover. The capacitor structure is completed by depositing a second thin polycrystalline silicon layer over the capacitor dielectric layer.
    • 实现了一种生产具有粗糙表面电极的微量化电容器的新方法。 该方法包括在合适的绝缘基底上沉积第一多晶或非晶硅层。 硅层原位沉积,均匀掺杂或沉积未掺杂,然后通过离子注入重复掺杂,然后加热。 该结构在高于约875℃下退火以形成任何非晶硅多晶并调节该层的晶粒尺寸。 多晶硅表面在高于约140℃的温度下不经受磷酸溶液,以部分蚀刻表面并引起均匀的粗糙化表面。 在其上沉积电容器介电层。 通过在电容器介电层上沉积第二薄多晶硅层来完成电容器结构。