发明名称 |
SiCN and SiN polishing slurries and polishing methods using the same |
摘要 |
A method is disclosed for polishing a wafer with a slurry. In the method, the wafer comprises at least one of silicon carbonitride (SiCN) and silicon nitride (SiN), and further comprises one or both of silicon dioxide (SiO2) and poly silicon, and a removal rate of SiCN is greater than a removal rate of poly silicon, and the removal rate of poly silicon is greater than a removal rate of SiO2, and where the slurry comprises up to about 15 wt % of surface-modified colloidal silica particles which have a primary particle size of less than about 35 nm, and the surface-modified colloidal silica particles comprise a plurality of acid moieties or salts thereof. |
申请公布号 |
US9284472(B2) |
申请公布日期 |
2016.03.15 |
申请号 |
US201414453491 |
申请日期 |
2014.08.06 |
申请人 |
FUJIMI INCORPORATED |
发明人 |
Saeki Fusayo;Kim Hooi-Sung |
分类号 |
H01L21/302;C09G1/02;H01L21/3105;H01L21/321;C09K3/14 |
主分类号 |
H01L21/302 |
代理机构 |
Foley & Lardner LLP |
代理人 |
Foley & Lardner LLP |
主权项 |
1. A polishing slurry comprising up to about 15 wt % of surface-modified colloidal silica particles,
wherein the surface-modified colloidal silica particles have an average primary particle diameter of less than about 35 nm, and the surface-modified colloidal silica particles comprise a plurality of acid moieties or salts of the acid moieties, wherein the slurry demonstrates that a removal rate of silicon carbonitride (SiCN) is greater than a removal rate of silicon nitride (SiN), the removal rate of SiCN is greater than a removal rate of poly silicon, and the removal rate of poly silicon is greater than a removal rate of silica (SiO2), wherein the slurry has a pH of less than about 6, and wherein the surface-modified colloidal silica particles are negatively charged. |
地址 |
Aichi JP |