Patent ID: 11942330
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of etching gallium oxide from a semiconductor substrate, the method comprising:
flowing a first reagent in a substrate processing region housing the semiconductor substrate, wherein the first reagent comprises HX, wherein H is hydrogen, wherein X is at least one of fluorine, chlorine, and bromine, and wherein the semiconductor substrate comprises an exposed region of gallium oxide overlying gallium nitride, and fluorinating the exposed region of gallium oxide to form a gallium halide and H2O;
flowing a second reagent in the substrate processing region, wherein the second reagent is at least one of trimethylgallium, tin acetylacetonate, tetramethylsilane, and trimethyltin chloride, the second reagent promoting a ligand exchange wherein a methyl group is transferred to the gallium halide to form a volatile Me2GaY or Me3Ga, wherein Me is methyl, and wherein Y is at least one of fluorine, chlorine, and bromine from the second reagent;
flowing a third reagent in the substrate processing region, wherein the third reagent is at least one of chlorine, bromine, boron trichloride, and boron tribromide; and
recessing a surface of the gallium oxide.