Patent ID: 11955370
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method comprising:
forming a first precursor layer along exposed surfaces within a gap in a self-limiting reaction between a first precursor and the exposed surfaces, wherein the first precursor layer is entirely chemically attached to the exposed surfaces within the gap, and wherein the first precursor layer has a same chemical composition as the first precursor;
re-exposing a portion of the surfaces within upper portions of the gap by partially etching the first precursor layer that has the same chemical composition as the first precursor, wherein a bottom surface of the gap remains covered by the first precursor layer after the first precursor layer is partially etched; and
forming a second precursor layer directly on a remaining portion of the first precursor layer, wherein forming the second precursor layer comprises flowing a second precursor on exposed surfaces of the remaining portion of the first precursor layer, and wherein the second precursor and the second precursor layer has a same chemical composition as the first precursor.