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2015 IEEE International Interconnect Technology Conference and 2015 IEEE Materials for Advanced Metallization Conference (IITC/MAM)最新文献

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Wafer level metallic bonding: Voiding mechanisms in copper layers 晶圆级金属键合:铜层中的空化机制
B. Imbert, P. Gondcharton, L. Benaissa, F. Fournel, M. Verdier
Promoted by the component miniaturization trend, three-dimensional integration appears as a promising option for implementation of the next generation of integrated circuits. In this context, copper is still an interesting material to be integrated to vertical interconnexion through direct metal-metal bonding processes. However, it was already reported that voiding phenomena occur in bonded copper layers for temperature beyond 300°C leading to serious reliability problems. This paper aims at explaining voiding mechanisms in the specific metal bonding configuration. Voiding characteristics are compared in different structures allows highlighting several thermal effects. It appears that the mechanical stress sustained by copper layers during post-bonding thermal processes is the main contribution in the voiding phenomenon. Creep mechanisms occurring in polycrystalline copper structure could be considered as the origin of this phenomenon. This study offers better understanding of reliability problems in structures involving encapsulated copper layers and can be used as guideline for metal bonding integration.
在元件小型化趋势的推动下,三维集成成为实现下一代集成电路的一个有希望的选择。在这种情况下,铜仍然是一种有趣的材料,可以通过直接的金属-金属键合过程集成到垂直互连中。然而,已经有报道称,当温度超过300°C时,结合铜层会出现空洞现象,导致严重的可靠性问题。本文旨在解释在特定的金属键合结构中的空化机制。在不同的结构中比较空化特性,可以突出几种热效应。铜层在键合后的热过程中承受的机械应力是造成空化现象的主要原因。发生在多晶铜结构中的蠕变机制可以被认为是这一现象的根源。该研究有助于更好地理解涉及封装铜层的结构的可靠性问题,并可作为金属键合集成的指导。
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引用次数: 7
High-voltage monolithic 3D capacitors based on through-silicon-via technology 基于硅通孔技术的高压单片三维电容器
S. Gruenler, G. Rattmann, T. Erlbacher, A. Bauer, L. Frey
High-voltage monolithic 3D capacitors operating at breakdown voltages up to 200 V are fabricated based on through silicon-via technology. Electric characteristics of monolithic 3D capacitors exhibit a capacitance density of 17 times larger than that of planar capacitors with the same area and dielectric thickness. Impact of the 3D capacitors' architecture on their electrical properties is studied for various patterns and geometries.
基于硅通孔技术制备了工作电压高达200v的高压单片3D电容器。在相同的面积和介质厚度下,单片三维电容器的电特性显示出比平面电容器大17倍的电容密度。研究了不同形状和几何形状的三维电容器结构对其电性能的影响。
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引用次数: 0
Ni silicides formation: Use of Ge and Pt to study the diffusing species, lateral growth and relaxation mechanisms Ni硅化物的形成:利用Ge和Pt研究其扩散种类、横向生长和弛豫机制
M. El Kousseifi, K. Hoummada, T. Epicier, D. Mangelinck
The Ni silicide formation was studied by in situ X-ray diffraction, APT and TEM through the use of either a thin layer of Ge (1 nm) deposited between the Ni film and a Si substrate or a Ni(10%Pt) film. The Ge was used as a marker for the diffusing species during Ni silicide formation and the Ni(10%Pt) allows revealing the lateral growth of NiSi.
利用原位x射线衍射、APT和透射电镜,在Ni薄膜和Si衬底之间沉积一层Ge (1 nm)薄层或Ni(10%Pt)薄膜,研究了Ni硅化物的形成。Ge被用作硅化镍形成过程中扩散物种的标记,Ni(10%Pt)可以显示NiSi的横向生长。
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引用次数: 1
Full 3D reciprocal space map of thin polycrystalline films for microelectronic applications 用于微电子应用的多晶薄膜的全三维互反空间图
T. Thanh, N. Blanc, N. Boudet, E. Bourjot, S. Zhiou, V. Kovacova, P. Rodriguez, F. Nemouchi, P. Gergaud
We introduce a full 3D reciprocal space map (RSM) measurement technique developed at the BM02 beamline (ESRF) in the framework of ultrathin polycrystalline films for microelectronic applications. This technique gives a complete overview of the reciprocal space in a large range of Bragg angles to detect and characterize the nature and texture of all phases present in a polycrystalline film. As a demonstration for this technique we have performed 3D RSM measurement on several kinds of samples: Ni-based germano-silicide on silicon for source/drain contacts in the framework of sub-20 nm FD-SOI transistors; Ni-based alloyed with III-V materials for power electronics application; and PZT thin films on silicon substrate for MEMS applications. New software (DEVA) is developed in pure Python language in order to quickly automatically and on line treat these multidimensional data, taking into account the specific geometry of our area detector XPAD.
我们介绍了一种基于BM02光束线(ESRF)的全三维互反空间映射(RSM)测量技术,该技术是在微电子应用的超薄多晶薄膜框架下开发的。该技术提供了在大范围的布拉格角范围内的互反空间的完整概述,以检测和表征多晶薄膜中存在的所有相的性质和纹理。作为该技术的演示,我们对几种样品进行了3D RSM测量:在低于20 nm的FD-SOI晶体管框架中,用于源/漏触点的硅上的ni基锗硅化物;电力电子用镍基合金III-V材料以及用于MEMS应用的硅衬底PZT薄膜。新的软件(DEVA)是在纯Python语言开发的,以便快速自动和在线处理这些多维数据,考虑到我们的区域探测器XPAD的特定几何形状。
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引用次数: 5
Numerical analysis of airgap stability under process-induced thermo-mechanical loads 过程热机械载荷作用下气隙稳定性的数值分析
H. Zahedmanesh, Mario Gonzalez, I. Ciofi, K. Croes, J. Boemmels, Z. Tokei
In order to understand the state of process induced stresses in air-gap interconnect structures fabricated by means of etch-back procedure, finite element (FE) models of a 90nm pitch interconnect were developed and stress analysis of the structure was conducted as a function of the dielectric liner and metal barrier (MB) thicknesses in a parametric study in order to minimize the risk of mechanical failure. The results identified the sidewall dielectric liner as the critical location where high stresses can result in failure of structures under thermo-mechanical loads. Simulations suggest that optimal mechanical stability is achieved by minimizing the MB thickness and maximizing the thickness of the conformal dielectric liner. The upper limit of the liner thickness however, is dictated by restrictions imposed by interline capacitance which can lead to RC delay.
为了了解反蚀刻工艺制造的气隙互连结构的过程诱导应力状态,建立了90nm间距互连结构的有限元模型,并在参数化研究中对结构进行了应力分析,作为介质衬垫和金属屏障厚度的函数,以最小化机械失效的风险。结果表明,在热机械载荷作用下,高应力可能导致结构破坏的关键位置是侧壁介质衬里。仿真结果表明,最小的介质厚度和最大的共形介质衬里厚度可以获得最佳的机械稳定性。然而,衬里厚度的上限是由可能导致RC延迟的线间电容施加的限制所决定的。
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引用次数: 3
Progress in thin wire back-end of-line development 细线后端开发的进展
R. Seidel, G. Bonsdorf, E. Clauss, J. Daleiden-, K. Donegan, F. Feustel, M. Hauschildt, B. Hintze, F. Koschinsky, G. Marxsen, R. Naumann, C. Peters, U. Queitsch, G. Talut, D. Theiss, M. Zinke
Substantial improvements have been achieved in interconnects with 90nm pitch. Solutions for an optimized patterning and metallization will be presented (e.g. ULK treatments during etch, complete metal hard-mask removal by wet-clean, ultra-thin PVD liner). A particular challenge for a semiconductor foundry is the band-width of customer specific designs and requirements. Novel design dependent process strategies have been developed. Transferring this learning will be crucial for a successful ramp of subsequent technologies.
在90nm间距的互连方面已经取得了实质性的改进。将提出优化图案和金属化的解决方案(例如,在蚀刻过程中进行ULK处理,通过湿式清洁完全去除金属硬掩膜,超薄PVD衬垫)。对于半导体代工厂来说,一个特别的挑战是客户特定设计和要求的带宽。新的设计依赖过程策略已经被开发出来。转移这种学习对于后续技术的成功发展至关重要。
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引用次数: 0
Direct etched Cu characterization for advanced interconnects 用于高级互连的直接蚀刻Cu表征
L. Wen, F. Yamashita, B. Tang, K. Croes, S. Tahara, Keiichi Shimoda, Takeru Maeshiro, E. Nishimura, F. Lazzarino, I. Ciofi, J. Bommels, Z. Tokei
Cu wires patterning by direct etch methods is investigated at 300mm wafer level. Cross-sectional sidewall profiles with tapering angles around 74.5° are obtained with a mid-line width of 44 nm, which paves the way to further scaling of this technique. Lower resistivity is demonstrated with respect to conventional Cu damascene process, with low leakage current between adjacent Cu lines. An in-situ 10nm SiN cap is deposited as a passivation to enable electrical and reliability tests. The electromigration (EM) characterization shows promising reliability performance of the direct etched Cu wires.
在300mm晶圆水平上研究了直接蚀刻方法的铜线图案。获得了锥度约为74.5°的横截面侧壁轮廓,中线宽度为44 nm,为进一步扩展该技术铺平了道路。与传统的铜腐蚀工艺相比,其电阻率更低,相邻铜线之间的漏电流更小。原位沉积10nm的SiN帽作为钝化,以进行电气和可靠性测试。电迁移(EM)表征表明,直接蚀刻铜线具有良好的可靠性。
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引用次数: 6
A 300mm Si photonics platform for optical interconnection 一种用于光互连的300mm硅光子平台
T. Mogami, T. Horikawa, K. Kinoshita, H. Sasaki, K. Morito, K. Kurata
The Si photonics platform for 300mm SOI wafers has been built up for optical multi-applications. Main optical devices have been demonstrated. State-of-the-art propagation loss values are obtained for optical waveguides of multi-thickness SOI structures in this platform. The propagation loss is less than 0.5 dB/cm at 1.55pm wavelength for 220nm-thick waveguides. MMI coupler, AWG and WDM filter showed enough high performance for their applications. The 50×50mm2 large Si interposers using photonics electronics convergence technology have been demonstrated. These results indicate that our Si photonics platform is very useful for optical multi-applications.
建立了用于300mm SOI晶圆的硅光子学平台,实现了多种光学应用。主要的光学器件已经演示。在该平台上获得了多厚度SOI结构光波导的最新传播损耗值。在1.55pm波长下,220nm厚波导的传输损耗小于0.5 dB/cm。MMI耦合器、AWG和WDM滤波器表现出足够高的应用性能。利用光电子会聚技术制备了50×50mm2大型硅中间体。这些结果表明我们的硅光子学平台在光学多用途应用中是非常有用的。
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引用次数: 4
Evaluation of adhesion energy and its correlation to apparent strength for Cu/SiN interface in copper damascene interconnect structures 铜damascene互连结构中Cu/SiN界面的粘附能及其与表观强度的关系
S. Kamiya, C. Chen, N. Shishido, M. Omiya, K. Koiwa, H. Sato, M. Nishida, T. Nakamura, T. Nokuo, T. Suzuki
Local apparent strength of interface between copper and cap layer on top was diverse depending on the crystal orientation underneath. For a comprehension of this diversity, physical adhesion energy to separate the interface was evaluated. It essentially does not include mechanical energy dissipating in plastic deformation in the process of crack extension. Sub-micron scale torsion test for elastic-plastic deformation properties and fracture tests on a number of different crystal orientations revealed that difference in adhesion energy is much smaller than difference in plastic dissipation energy. It is highly likely that small difference in the former is intensified through the latter, leading to a huge scatter in strength of LSI interconnect structures.
铜与盖层界面的局部视强度随晶体取向的不同而不同。为了理解这种多样性,对分离界面的物理粘附能进行了评估。它本质上不包括裂纹扩展过程中塑性变形耗散的机械能。亚微米尺度的弹塑性变形性能扭转试验和多个不同晶向的断裂试验表明,黏附能的差异远小于塑性耗散能的差异。前者的微小差异很有可能通过后者被强化,从而导致大规模集成电路互连结构强度的巨大分散。
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引用次数: 1
Nanostructured material formation for beyond Si devices 超硅器件的纳米结构材料形成
H. L. Chang, C. T. Chang, C. Kuo
Beyond Si CMOS technology is the current challenging for next generation transistor. As demand for nano-scaled devices increase, the ability to manipulate the building blocks of electronic is essential. Catalytic-assisted CNTs are integrated into trenches, holes, parallel plates under CH4/H2 gases by microwave plasma chemical vapor deposition or electron cyclotron resonance deposition. The trench and parallel plates are used to fabricate for gate electrodes, while the holes are used to make interconnections. Results indicate the orientation of grown CNTs is dominated by pattern geometry. The field emission results show that the CNTs exhibit robust electronic properties with emission densities of over ImA/cm2 at 3.97 and 6.30 V/um indicating the high electron emission efficiency as the CNT field effect transistor application. The growth models of Fe, Ni and CoSi2 and application for nanoelectronics are purposed.
超越硅的CMOS技术是当前下一代晶体管面临的挑战。随着对纳米级器件需求的增加,操纵电子元件的能力变得至关重要。通过微波等离子体化学气相沉积或电子回旋共振沉积,在CH4/H2气体下将催化辅助CNTs集成到沟槽、空穴、平行板中。沟槽和平行板用于制造栅极,而孔用于进行互连。结果表明,生长的碳纳米管的取向受图案几何形状的支配。场发射结果表明,在3.97和6.30 V/um下,碳纳米管具有良好的电子发射性能,发射密度均超过ImA/cm2,表明碳纳米管场效应晶体管具有较高的电子发射效率。介绍了Fe、Ni和CoSi2的生长模型及其在纳米电子学中的应用。
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引用次数: 0
期刊
2015 IEEE International Interconnect Technology Conference and 2015 IEEE Materials for Advanced Metallization Conference (IITC/MAM)
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