Multi-patterning to form vias with straight profiles

    公开(公告)号:US11049763B2

    公开(公告)日:2021-06-29

    申请号:US16694406

    申请日:2019-11-25

    IPC分类号: H01L21/768 H01L21/311

    摘要: A method includes forming a carbon-containing layer with a carbon atomic percentage greater than about 25 percent over a first hard mask layer, forming a capping layer over the carbon-containing layer, forming a first photo resist over the capping layer, and etching the capping layer and the carbon-containing layer using the first photo resist as a first etching mask. The first photo resist is then removed. A second photo resist is formed over the capping layer. The capping layer and the carbon-containing layer are etched using the second photo resist as a second etching mask. The second photo resist is removed. A third photo resist under the carbon-containing layer is etched using the carbon-containing layer as etching mask. A dielectric layer underlying the third photo resist is etched to form via openings using the third photo resist as etching mask. The via openings are filled with a conductive material.

    Reduction of Line Wiggling
    7.
    发明申请

    公开(公告)号:US20190067022A1

    公开(公告)日:2019-02-28

    申请号:US15871675

    申请日:2018-01-15

    IPC分类号: H01L21/308 H01L21/768

    摘要: A method for reducing wiggling in a line includes forming a silicon patterning layer over a substrate and depositing a mask layer over the silicon patterning layer. The mask layer is patterned to form one or more openings therein. The mask layer is thinned and the one or more openings are widened, to provide a smaller height-to-width ratio. The pattern of the mask layer is then used to pattern the silicon patterning layer. The silicon patterning layer is used, in turn, to pattern a target layer where a metal line will be formed.