Diffusion behavior of Cu/Ta heterogeneous interface under high temperature and high strain: An atomistic investigation
Diffusion behavior of Cu/Ta heterogeneous interface under high temperature and high strain: An atomistic investigation
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高温高应变下 Cu/Ta 异质界面的扩散行为:原子研究
DOI:
10.1063/1.4997677
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发表时间:
2017-09
期刊:
影响因子:
1.6
通讯作者:
Zhu Wenhui
中科院分区:
文献类型:
--
作者:
Li Ganglong;Wu Houya;Luo Honglong;Chen Zhuo;Tay Andrew A. O.;Zhu Wenhui
Three-dimensional (3D) integration technology using Cu interconnections has emerged as a promising solution to improve the performance of silicon microelectronic devices. However, Cu diffuses into SiO2 and requires a barrier layer such as Ta to ensure acceptable reliability. In this paper, the effects of temperature and strain normal to the interface on the inter-diffusion of Cu and Ta at annealing conditions are investigated using a molecular dynamics (MD) technique with embedded atomic method (EAM) potentials. Under thermal annealing conditions without strain, it is found that a Cu-rich diffusion region approximately 2 nm thick is formed at 1000 K after 10 ns of annealing. Ta is capable of diffusing into the interior of Cu but Cu hardly diffuses into the inner lattice of Ta. At the Cu side near the interface an amorphous structure is formed due to the process of diffusion. The diffusion activation energy of Cu and Ta are found to be 0.9769 and 0.586 eV, respectively. However, when a strain is applied, a...
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