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    • 1. 发明授权
    • Butted contact shape to improve SRAM leakage current
    • 对接接触形状,提高SRAM漏电流
    • US09006826B2
    • 2015-04-14
    • US13470496
    • 2012-05-14
    • Tzyh-Cheang Lee
    • Tzyh-Cheang Lee
    • H01L21/8244H01L21/768H01L23/485H01L27/11
    • H01L27/1104H01L21/76802H01L21/76816H01L21/76877H01L21/76895H01L23/485H01L2924/00H01L2924/0002Y10S257/902Y10S257/903Y10S257/904
    • The present disclosure relates to an SRAM memory cell. The SRAM memory cell has a semiconductor substrate with an active area and a gate region positioned above the active area. A butted contact extends along a length (i.e., the larger dimension of the butted contact) from a position above the active area to a position above the gate region. The butted contact contains a plurality of distinct regions having different widths (i.e., the smaller dimensions of the butted contact), such that a region spanning the active area and gate region has width less than the regions in contact with the active area or gate region. By making the width of the region spanning the active area and gate region smaller than the regions in contact with the active area or gate, the etch rate is reduced at a junction of the gate region with the active area, thereby preventing etch back of the gate material and leakage current.
    • 本公开涉及SRAM存储单元。 SRAM存储单元具有半导体衬底,其具有有源区和位于有源区上方的栅极区。 对接触头沿着有效区域上方的位置的长度(即,对接触点的较大尺寸)延伸到栅极区域上方的位置。 对接触点包含具有不同宽度的多个不同区域(即,对接触点的较小尺寸),使得横跨有源区域和栅极区域的区域的宽度小于与有源区域或栅极区域接触的区域 。 通过使跨越有源区域和栅极区域的区域的宽度小于与有源区域或栅极接触的区域,在栅极区域与有源区域的接合处蚀刻速率降低,从而防止蚀刻 栅极材料和漏电流。