Selective etch of silicon nitride
    62.
    发明授权
    Selective etch of silicon nitride 有权
    氮化硅的选择性蚀刻

    公开(公告)号:US08956980B1

    公开(公告)日:2015-02-17

    申请号:US14089182

    申请日:2013-11-25

    Abstract: A method of etching silicon nitride on patterned heterogeneous structures is described and includes a remote plasma etch formed from a fluorine-containing precursor and a nitrogen-and-oxygen-containing precursor. Plasma effluents from two remote plasmas are flowed into a substrate processing region where the plasma effluents react with the silicon nitride. The plasmas effluents react with the patterned heterogeneous structures to selectively remove silicon nitride while very slowly removing silicon, such as polysilicon. The silicon nitride selectivity results partly from the introduction of fluorine-containing precursor and nitrogen-and-oxygen-containing precursor using distinct (but possibly overlapping) plasma pathways which may be in series or in parallel.

    Abstract translation: 描述了在图案化的异质结构上蚀刻氮化硅的方法,并且包括由含氟前体和含氮和氧的前体形成的远程等离子体蚀刻。 来自两个远程等离子体的等离子体流出物流入基板处理区域,其中等离子体流出物与氮化硅反应。 等离子体流出物与图案化的异质结构反应以选择性地去除氮化硅,同时非常缓慢地除去硅,例如多晶硅。 氮化硅选择性部分取决于使用可能是串联或并联的不同(但可能重叠的)等离子体途径引入含氟前体和含氮和氧的前体。

    Flow control features of CVD chambers

    公开(公告)号:US12146219B2

    公开(公告)日:2024-11-19

    申请号:US16745141

    申请日:2020-01-16

    Abstract: Apparatus and methods for gas distribution assemblies are provided. In one aspect, a gas distribution assembly is provided comprising an annular body comprising an annular ring having an inner annular wall, an outer wall, an upper surface, and a bottom surface, an upper recess formed into the upper surface, and a seat formed into the inner annular wall, an upper plate positioned in the upper recess, comprising a disk-shaped body having a plurality of first apertures formed therethrough, and a bottom plate positioned on the seat, comprising a disk-shaped body having a plurality of second apertures formed therethrough which align with the first apertures, and a plurality of third apertures formed between the second apertures and through the bottom plate, the bottom plate sealingly coupled to the upper plate to fluidly isolate the plurality of first and second apertures from the plurality of third apertures.

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