摘要
利用磁控溅射方法在表面有SiO2 层的Si基片上溅射Ta/NiFe薄膜 ,采用X射线光电子能谱 (XPS)研究了SiO2 /Ta界面以及Ta5Si3 标准样品 ,并进行计算机谱图拟合分析 .实验结果表明在制备态下在SiO2 /Ta界面处发生了热力学上有利的化学反应 :37Ta +15SiO2 =5Ta5Si3 +6Ta2 O5,界面处形成更稳定的化合物新相Ta5Si3 、Ta2 O5.在采用Ta作阻挡层的ULSI铜互连结构中这些反应产物可能有利于对Cu扩散的阻挡 .
Ta/NiFe film is deposited on Si substrate precoated with SiO_2 by magnetron sputtering.SiO_2/Ta interface and Ta_5Si_3 standard sample are investigated by using X-ray photoelectron spectroscopy (XPS) and peak decomposition technique.The results show that there is a thermodynamically favorable reaction at the SiO_2/Ta interface:37Ta+15SiO_2=5Ta_5Si_3+6Ta_2O_5.The more stable products Ta_5Si_3 and Ta_2O_5 may be beneficial to stop the diffusion of Cu into SiO_2.
基金
国家自然科学基金资助项目 (批准号 :19890 310 )~~
