کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1518265 | 1511609 | 2008 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Controlling Ta phase in Ta/TaN bilayer by surface pre-treatment on TaN
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Beyond 0.13 μm feature size, a bilayer of Ta/TaN is commonly used as a metal barrier and adhesive layer for copper multilevel interconnections. However, for the Ta films, cubic α-phase is preferred due to the lower resistivity, whereas high-resistive tetragonal β-phase should be avoided but easily formed by sputtering. Here, we demonstrate that the Ta overlayer phase can be effectively controlled by resputtering TaN surface using Ar prior to Ta growth. Upon surface treatment for enough time, α-phase forms instead of β-Ta. The intriguing phase change is attributed to the decrease of TaN lattice constant toward the surface, which renders a better lattice-matched template for α-Ta. From Auger depth profile, resputtering causes nitrogen deficiency in the surface layer of TaN to become TaN0.1, leading to about 1.9% lattice mismatch. The mechanism for the phase change of the Ta overlayer was further verified by examining phase evolution of Ta deposited on various materials with different structure and lattice constants including W, TaNx (x<1) and Ti.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 69, Issues 2â3, FebruaryâMarch 2008, Pages 501-504
Journal: Journal of Physics and Chemistry of Solids - Volume 69, Issues 2â3, FebruaryâMarch 2008, Pages 501-504
نویسندگان
Jung-Chih Tsao, Chuan-Pu Liu, Ying-Lang Wang, Yu-Sheng Wang, Ke-Wei Chen,