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梯度α-Ta(N)/TaN扩散阻挡层的微结构与热稳性定

Thermal stability and microstructure of graded α-Ta(N)/TaN bi-layer diffusion barrier
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摘要 本文提出了一种梯度氮化法制备出低阻、高稳定性的α-Ta(N)/TaN双层Cu扩散阻挡层,该方法有效地避免了异质元素的引入和高N含量导致的高电阻率.用四点探针(FPP)、X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)进行薄膜电性能和微结构的表征.分析结果表明,梯度氮化工艺能调控金属Ta膜的相结构,从而获得低阻α-Ta(N)/TaN双层Cu扩散阻挡层结构.高温老化退火的实验结果进一步证明此结构具有高的热稳定性,失效温度高达800℃. α-Ta(N)/TaN bi-layers diffusion barriers with lower resistance were prepared by a magnetron sputtering method with controlling Nz flow rate forming a transition layer on TaN layer. Four-point probe (FPP), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for characterization of the diffusion barriers microstructure before and after annealing The results show that the as-deposited graded α-Ta(N)/TaN bi-layer films have lower resistivity and good crystallinity, and the graded α-Ta(N)/TaN bi-layer diffusion barrier has an excellent thermally stability. Its failure temperα- ture can be up to 800 ℃.
出处 《四川大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第1期163-167,共5页 Journal of Sichuan University(Natural Science Edition)
基金 国家自然科学基金(50771069 50871083) 四川省科技支撑计划基金(2008FZ0002) 教育部新世纪人才基金(NCET-08-0380) 金属材料强度国家重点实验室开放基金(201011006) 材料腐蚀与防护四川省重点实验室开放基金项目(2011CL1S) 四川理工学院人才引进基金项目(2011RC05)
关键词 扩散阻挡层 电阻率 热稳定性 微结构 diffusion barrier, resistivity, thermal stability, microstructure
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参考文献27

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