公开(公告)号：US20220310448A1

公开(公告)日：2022-09-29

申请号：US17839170

申请日：2022-06-13

Applicant: Applied Materials, Inc.

Inventor： Xin LIU ,  Fei WANG ,  Rui CHENG ,  Abhijit Basu MALLICK ,  Robert Jan VISSER

IPC: H01L21/768 ,  C23C16/01 ,  C23C16/24 ,  C23C16/455 ,  C23C16/46 ,  C23C16/56 ,  H01L21/02 ,  H01L21/3205

Abstract: Embodiments of the present disclosure relate to processes for filling trenches. The process includes depositing a first amorphous silicon layer on a surface of a layer and a second amorphous silicon layer in a portion of a trench formed in the layer, and portions of side walls of the trench are exposed. The first amorphous silicon layer is removed. The process further includes depositing a third amorphous silicon layer on the surface of the layer and a fourth amorphous silicon layer on the second amorphous silicon layer. The third amorphous silicon layer is removed. The deposition/removal cyclic processes may be repeated until the trench is filled with amorphous silicon layers. The amorphous silicon layers form a seamless amorphous silicon gap fill in the trench since the amorphous silicon layers are formed from bottom up.