公开(公告)号：US20150064919A1

公开(公告)日：2015-03-05

申请号：US14072430

申请日：2013-11-05

Applicant: APPLIED MATERIALS, INC.

Inventor： Jinsu KIM ,  Xiaosong JI ,  Jinhan CHOI ,  Ho Jeong KIM ,  Byungkook KONG ,  Hoon Sang LEE

IPC: H01L21/3065

CPC classification number: H01L21/3065 ,  H01J37/321 ,  H01J2237/3347 ,  H01L21/02238 ,  H01L21/02252 ,  H01L21/02315 ,  H01L21/3083 ,  H01L21/31116 ,  H01L21/76224

Abstract: Embodiments of methods for etching a substrate include exposing the substrate to a first plasma formed from an inert gas; exposing the substrate to a second plasma formed from an oxygen-containing gas to form an oxide layer on a bottom and sides of a low aspect ratio feature and a high aspect ratio feature, wherein the oxide layer on the bottom of the low aspect ratio feature is thicker than on the bottom of the high aspect ratio feature; etching the oxide layer from the bottom of the low and high aspect ratio features with a third plasma to expose the bottom of the high aspect ratio feature while the bottom of the low aspect ratio feature remains covered; and exposing the substrate to a fourth plasma formed from a halogen-containing gas to etch the bottom of the low aspect ratio feature and the high aspect ratio feature.

Abstract translation: 用于蚀刻衬底的方法的实施例包括将衬底暴露于由惰性气体形成的第一等离子体; 将衬底暴露于由含氧气体形成的第二等离子体以在低纵横比特征和高纵横比特征的底部和侧面上形成氧化物层，其中低纵横比特征的底部上的氧化物层 比高宽比特征的底部厚; 使用第三等离子体从低和高纵横比特征的底部蚀刻氧化物层，以暴露高纵横比特征的底部，而低纵横比特征的底部保持覆盖; 并将衬底暴露于由含卤素气体形成的第四等离子体，以蚀刻低纵横比特征和高纵横比特征的底部。