Ruthenium Bottom Electrode Prepared by Electroplating for a High Density DRAM Capacitor
作者:Oh Joong Kwon、Seung Hwan Cha、Jae Jeong Kim
DOI:10.1149/1.1637900
日期:——
led to a continuous Ru film deposition. The surface roughness was measured to be 4.4 nm at 45 nm Ru film on the bare substrate. Moreover Ru electroplating method was also applied to a capacitor node-type TiN wafer. The deposition rate of Ru on the patterned wafer was the same as that on a bare wafer. The film showed 93% step coverage and good adhesion, comparable to CVD Ru films.
研究了将 Ru 电镀用作高密度动态随机存取存储器 (DRAM) 电容器底部电极的可能性。在 TiN 基板上电镀 Ru 之前,执行 HF 清洁和 Pd 活化。通过 HF 处理从 TiN 衬底中去除 Ti 氧化物能够激活 Pd,这增强了 TiN 衬底上 Ru 的成核。优化的预处理导致连续的 Ru 薄膜沉积。在裸基板上的 45 nm Ru 膜处测量表面粗糙度为 4.4 nm。此外,Ru电镀方法也应用于电容器节点型TiN晶片。Ru在图案化晶圆上的沉积速率与裸晶圆上的相同。该薄膜表现出 93% 的阶梯覆盖率和良好的附着力,可与 CVD Ru 薄膜相媲美。