Patent ID: 11901217
Assignee: NEXCHIP SEMICONDUCTOR CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. The method for making a shallow trench structure according to claim 1, wherein the first lateral etching and the second lateral etching are performed by an apparatus for making a shallow trench structure, wherein the apparatus comprises:
a plurality of liquid inlet pipes, vertically provided in the shallow trench;
a plurality of liquid ejection heads, each of the liquid ejection heads is connected with each of the liquid inlet pipes, and the liquid ejection heads face a lateral wall of the second material layer close to the shallow trench;
a plurality of first lateral etching channels, one end of each of the first lateral etching channels is vertically connected to each of the liquid inlet pipes; the other end of each of the first lateral etching channels is in contact with a lateral wall of the second material layer close to the shallow trench; the shape and size of the cross section of each of the first lateral etching channels match the shape and size of a lateral wall of the second material layer close to the shallow trench; each of the first lateral etching channels covers the exterior of each of the liquid ejection heads; the wet etching reagent flows through the first lateral etching channels to perform a first lateral etching on the lateral wall of the second material layer;
a plurality of intake pipes, vertically provided in the shallow trench;
a plurality of jet heads, each of the jet heads is connected with each of the intake pipes, and the jet heads face a lateral wall of the first material layer close to the shallow trench; and
a plurality of second lateral etching channels, one end of each of the second lateral etching channels is vertically connected to each of the intake pipes; the other end of each of the second lateral etching channels is in contact with a lateral wall of the first material layer close to the shallow trench; the shape and size of the cross section of each of the second lateral etching channels match the shape and size of a lateral wall of the first material layer close to the shallow trench; each of the second lateral etching channels covers the exterior of each of the jet heads; the dry etching gas flows through the second lateral etching channels to perform a second lateral etching on the lateral wall of the first material layer.