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

Claim 10:
11. 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 MeX, wherein X is at least one of fluorine, chlorine, and bromine, wherein Me comprises at least one of titanium, niobium, tantalum, molybdenum, tungsten, or sulfur, and wherein the semiconductor substrate comprises an exposed region of gallium oxide, 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, aluminum chloride, tin tetrachloride, tin acetylacetonate, tetramethylsilane, trimethyltin chloride, and boron tribromide, the second reagent promoting a ligand exchange, wherein the ligand exchange forms a volatile; and
recessing a surface of the gallium oxide, wherein an etching selectivity between gallium oxide and gallium nitride is greater than or about 10:1.