Methods for selective dry etching gallium oxide

    公开(公告)号:US11942330B2

    公开(公告)日:2024-03-26

    申请号:US17836694

    申请日:2022-06-09

    IPC分类号: H01L21/311 H01L21/02

    CPC分类号: H01L21/31122 H01L21/02175

    摘要: Exemplary methods of etching gallium oxide from a semiconductor substrate may include flowing a first reagent in a substrate processing region housing the semiconductor substrate. The first reagent may include HX. X may be at least one of fluorine, chlorine, and bromine. The semiconductor substrate may include an exposed region of gallium oxide. Fluorinating the exposed region of gallium oxide may form a gallium halide and H2O. The methods may include flowing a second reagent in the substrate processing region. The second reagent may be at least one of trimethylgallium, tin acetylacetonate, tetramethylsilane, and trimethyltin chloride. The second reagent may promote a ligand exchange where a methyl group may be transferred to the gallium halide to form a volatile Me2GaY or Me3Ga. Y may be at least one of fluorine, chlorine, and bromine from the second reagent. The methods may include recessing a surface of the gallium oxide.