METHODS FOR ETCHING A MATERIAL LAYER FOR SEMICONDUCTOR APPLICATIONS

    公开(公告)号:US20220399205A1

    公开(公告)日:2022-12-15

    申请号:US17770019

    申请日:2019-12-23

    Abstract: An apparatus and method for etching a material layer with a cyclic etching and deposition process. The method for etching a material layer on a substrate includes: (a) etching at least a portion of a material layer (302) on a substrate (101) in an etch chamber (100) to form an open feature (360) having a bottom surface (312) and sidewalls in the material layer (302); (b) forming a protection layer (314) on the sidewalls and the bottom surface (312) of the open feature (360) from a protection layer (314) gas mixture comprising at least one carbon-fluorine containing gas; (c) selectively removing the protection layer (314) formed on the bottom surface (312) of the open feature (360) from a bottom surface (312) open gas mixture comprising the carbon-fluorine containing gas; and (d) continuingly etching the material layer (302) from the bottom surface (312) of the open feature (360) until a desired depth of the open feature (360) is reached.

    METHOD OF DEPOSITING A PRE-ETCH PROTECTIVE LAYER

    公开(公告)号:US20220059359A1

    公开(公告)日:2022-02-24

    申请号:US17367038

    申请日:2021-07-02

    Abstract: A method of cyclic etching, comprising: (A) depositing, prior to cyclically etching a substrate through a mask opening, a pre-etch protection layer conformally over the mask, sidewalls of the mask defining the mask opening; and an exposed portion of the substrate exposed through the mask opening, the pre-etch protection layer deposited to a first thickness; and (B) cyclically etching the substrate by: (i) depositing a protection layer in the opening of the mask, the protection layer deposited to a second thickness that is less than half of the first thickness; (ii) etching through a portion of the protection layer disposed on the substrate and etching the substrate; and (iii) repeating (i) and (ii) until an end point is reached.

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