High crystalline quality of SiGe fin fabrication with Si-rich composition area using replacement fin processing

• 作者: An-Yan Du Hao-Yan Liu Wen-Wu Wang Xiao-Hong Cheng Ying Zan Yong-Liang Li Zhen-Hua Hu Zhi-Qian Zhao
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（8）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC,AND OPTICAL PROPERTIES
• 页码范围: 499-503
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab973e

摘要

A high crystalline quality of SiGe fin with an Si-rich composition area using the replacement fin processing is systematically demonstrated in this paper.The fin replacement process based on a standard FinFET process is developed.A width of less than 20-nm SiGe fin without obvious defect impact both in the direction across the fin and in the direction along the fin is verified by using the high angle annular dark field scanning transmission electron microscopy and the scanning moiré fringe imaging technique.Moreover,the SiGe composition is inhomogenous in the width of the fin.This is induced by the formation of { 111 } facets.Due to the atomic density of the { 111 } facets being higher,the epitaxial growth in the direction perpendicular to these facets is slower than in the direction perpendicular to {001}.The Ge incorporation is then higher on the {111} facets than on the {001} facets.So,an Si-rich area is observed in the central area and on the bottom of SiGe fin.