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2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD)最新文献

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Statistical Variability Simulation of Novel Capacitor-less Z2FET DRAM: From Transistor to}Circuit 新型无电容Z2FET DRAM的统计变异性模拟:从晶体管到电路
M. Duan, B. Cheng, F. Adamu-Lema, P. Asenov, T. Dutta, X. Wang, V. Georgiev, C. Millar, P. Pfaeffli, A. Asenov
The downscaling of traditional DRAM [1] is facing challenges due to the presence of external capacitor. Z2FET [2–5] has been demonstrated as a promising DRAM candidate eliminating theneed for external capacitor. In the past, attention was focused on the optimization of device structure [5] and fabrication process [2] without paying much attention to the Statistical (local) Variability (SV) which is crucial for any memory technology. In this paper, a novel simulation methodology is proposed and the SV of DRAM Memory Window (MW) is investigated systematically. It is found that SV of MW is dominated by Metal Gate Granularity (MGG) coming from the Gated-SOI region of the Z2FET. Although Random Discrete Dopant (RDD) induced variations in the threshold voltage (Vth) has larger spread in the Intrinsic-SOI part, it has no significant effect on the overall Z2FET characteristics. Based on the proposed methodology, SV of MW at different process corners has also been studied. Results reveal the necessity for further process optimization due to the best corner giving rise not only to larger average MW but also less variations. Furthermore, circuit level read performance (including the variability) of a Z2FET-based memory cell have been evaluated. All these findings could guide the further performance optimization from both device and memory cell circuit point of view for Z2FET-based volatile memory product development.
由于外部电容的存在,传统DRAM[1]的小型化面临挑战。Z2FET[2-5]已被证明是一种很有前途的DRAM候选者,无需外部电容器。过去,人们的注意力主要集中在器件结构[5]和制造工艺[2]的优化上,而对任何存储技术都至关重要的统计(局部)可变性(SV)没有太多关注。本文提出了一种新的仿真方法,系统地研究了DRAM内存窗的SV。结果表明,微波的SV主要由来自Z2FET栅极soi区的金属栅粒度(MGG)决定。尽管随机离散掺杂剂(RDD)引起的阈值电压(Vth)变化在Intrinsic-SOI部分具有较大的扩散性,但它对Z2FET的整体特性没有显著影响。在此基础上,还研究了不同工艺角下的超临界流体动力学特性。结果表明,由于最佳角不仅会产生较大的平均MW,而且会产生较小的变化,因此需要进一步优化工艺。此外,对基于z2fet的存储单元的电路级读取性能(包括可变性)进行了评估。所有这些发现都可以从器件和存储单元电路的角度指导基于z2fet的易失性存储器产品开发的进一步性能优化。
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引用次数: 1
A versatile harmonic balance method in a parallel framework 并联结构的通用谐波平衡方法
Andy Huang, Xujiao Gao, R. Pawlowski, J. Gates, L. Musson, G. Hennigan, Mihai Negoita
In this paper, we present a parallelized and versatile harmonic balance approach for modeling the small-signal and large-signal frequency-domain response of the coupled semiconductor drift-diffusion equations used in TCAD device simulations. Our approach begins with a time-domain TCAD code, and we describe the process to adapt the system into the frequency domain so that the transformation can be parallelized. Both small-signal and large-signal analyses are easily simultaneously incorporated. Furthermore, we introduce the Isofrequency Remapping Scheme, so that an arbitrary number of high frequencies can be analyzed without introducing a prohibitive expense. Results obtained by our small-signal and large signal harmonic balance methods are shown to capture the same response for a linear device, as expected. Further results use our harmonic balance method to explore a prohibitively expensive time-domain problem: a large-signal, two-tone simulation too costly for a time-domain analysis, for which we are able to produce the expected response with intermodulation.
在本文中,我们提出了一种并行和通用的谐波平衡方法来模拟用于TCAD器件仿真的耦合半导体漂移-扩散方程的小信号和大信号频域响应。我们的方法从时域TCAD代码开始,我们描述了将系统适应到频域的过程,以便可以并行化转换。小信号和大信号分析很容易同时结合。此外,我们还引入了等频重映射方案,以便在不引入过高费用的情况下分析任意数量的高频。我们的小信号和大信号谐波平衡方法得到的结果表明,对于线性器件,可以捕获相同的响应,正如预期的那样。进一步的结果使用我们的谐波平衡方法来探索一个代价高昂的时域问题:大信号,双音模拟对于时域分析来说太昂贵了,因此我们能够通过互调产生预期的响应。
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引用次数: 0
Design Guidelines and Limitations of Multilayer Two-dimensional Vertical Tunneling FETs for UltraLow Power Logic Applications 用于超低功耗逻辑应用的多层二维垂直隧道场效应管的设计指南和限制
Shang-Chun Lu, Yuanchen Chu, Youngseok Kim, M. Mohamed, Gerhard Klimeck, T. Palacios, Umberto Ravaioli
New designs for vertical 2D-materials-based TFETs are proposed in this paper adopting asymmetric layer numbers for the top and bottom layer with undoped source/drain using Black Phosphorus as an example. The results show that abrupt turn-on and Ion/Ioff > 105 can be sustained when the channel length is down to sub-5 nm. The results are benchmarked against other TFETs based on promising 2D materials homo-/hetero-structures, meanwhile, the limitations, as well as guidelines, are presented.
本文以黑磷为例,提出了一种垂直二维材料基tfet的新设计方法,采用不对称层数的顶层和底层,不掺杂源/漏极。结果表明,当通道长度减小到5 nm以下时,可以持续出现突然导通和离子/断比> 105的现象。结果与其他基于有前途的二维材料同质/异质结构的tfet进行了基准测试,同时提出了局限性和指导方针。
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引用次数: 0
FANTASI: A novel devices-to-circuits simulation framework for fast estimation of write error rates in spintronics FANTASI:一种用于快速估计自旋电子学中写入错误率的新型器件到电路仿真框架
Venkata Pavan Kumar Miriyala
Though physical mechanisms such as spin-transfer torque (STT), spin-orbit torque (SOT), and voltage-controlled magnetic anisotropy (VCMA) has potential to enable energyefficient and ultra-fast switching of spintronic devices, the switching dynamics are stochastic due to thermal fluctuations. Thus, there is a need in spintronics to understand the interactions between circuit design and the error rate in the switching mechanism, called as write error rate. In this paper, we propose a novel devices-to-circuits simulation framework (FANTASI) for fast estimation of the write error rates (WER) in different spintronic devices and circuits. Here, we show that, FANTASI enables efficient spintronic device-circuit co-design, with results in good agreement with the experimental measurements.
尽管自旋传递转矩(STT)、自旋轨道转矩(SOT)和电压控制磁各向异性(VCMA)等物理机制有可能实现自旋电子器件的高效和超快速开关,但由于热波动,开关动力学是随机的。因此,在自旋电子学中有必要了解电路设计与开关机制中的错误率(称为写错误率)之间的相互作用。在本文中,我们提出了一个新的器件到电路仿真框架(FANTASI),用于快速估计不同自旋电子器件和电路中的写入错误率(WER)。在这里,我们表明,FANTASI实现了有效的自旋电子器件电路协同设计,结果与实验测量结果很好地吻合。
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引用次数: 4
SISPAD 2018 Conference Schedule at a Glance SISPAD 2018会议日程一览
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引用次数: 0
VHDL-AMS Thermo-Mechanical Model for Coupled Analysis of Power Module Degradation in Circuit Simulation Environments 电路仿真环境下功率模块退化耦合分析的VHDL-AMS热-力学模型
O. Olanrewaju, A. Castellazzi
This work proposes the development of a simplified thermo-mechanical model suitable for coupling with device physics and a 3D electrothermal model in line with the creation of a comprehensive framework for circuit simulation of multidomain problems. Commercially available numerical analysis software are capable of showing thermo-mechanical effects but lack real-time feedback between domains and require sophisticated CAD/meshing. Here, we show a ID mechanical model coupled to a thermal model which is capable of generating accurate mechanical Strain and stress values of a power assembly while optimizing the tradeoff with computational efficiency. The thermo-mechanical model was created in VHDL-AMS language because of the multi-domain capability of VHDL-AMS.
这项工作提出了一种简化的热-机械模型的发展,适合与器件物理耦合,并建立了一个3D电热模型,以建立一个综合框架,用于多域问题的电路仿真。商业上可用的数值分析软件能够显示热力学效应,但缺乏域之间的实时反馈,并且需要复杂的CAD/网格划分。在这里,我们展示了一个耦合到热模型的ID力学模型,该模型能够生成准确的动力组件的机械应变和应力值,同时优化计算效率的权衡。利用VHDL-AMS的多域特性,采用VHDL-AMS语言建立热力学模型。
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引用次数: 1
Electron-only explicit screening quantum transport model for semiconductor nanodevices 半导体纳米器件的纯电子显式筛选量子输运模型
Yuanchen Chu, Prasad Sarangapani, J. Charles, Gerhard Klimeck, T. Kubis
State of the art quantum transport models for semi-conductor nanodevices attribute negative (positive) unit charges to states of the conduction (valence) band. Hybrid states that enable band-to-band tunneling are subject to interpolation that yield model dependent charge contributions. In any nanodevice structure, these models rely on device and physics specific input for the dielectric constants. This work exemplifies the large variability of different charge interpretation models when applied to ultrathin body transistor performance predictions. To solve this modeling challenge, an electron-only band structure model is extended to atomistic quantum transport. Performance predictions of MOSFETs and tunneling FETs confirm the generality of the new model and its independence of additional screening models.
目前半导体纳米器件的量子输运模型将负(正)单位电荷归因于导(价)带的状态。能够实现带到带隧道的混合状态受到插值,从而产生依赖于模型的电荷贡献。在任何纳米器件结构中,这些模型依赖于器件和物理特定的介电常数输入。这项工作举例说明了不同电荷解释模型在应用于超薄体晶体管性能预测时的巨大可变性。为了解决这一建模挑战,将电子带结构模型扩展到原子量子输运。对mosfet和隧道fet的性能预测证实了新模型的通用性及其与附加筛选模型的独立性。
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引用次数: 0
Biaxial Strain based Performance Modulation of Negative-Capacitance FETs 负电容场效应管的双轴应变性能调制
Moon-Deock Kim, Junbeom Seo, M. Shin
In this work, we report device simulations conducted to study the performance of biaxially strained ferroelectric-based negative capacitance FETs (NCFETs). We adopted PbZr0.5 Ti0.5 O3 (PZT) and HfO2 as ferroelectric materials and applied biaxial strain using the first-principles method. It was found that PZT and HfO2 show different trends in the negative capacitance (NC) region under biaxial strain. Biaxial strain strongly affects the NC of PZT, whereas HfO2 is not as susceptible to biaxial strain as PZT. When no strain is applied, HfO2-based NCFETs exhibit a better performance than PZT-based NCFETs. However, the subthreshold slope and ON-state current are improved in the case of PZT-based NCFETs when the compressive biaxial strain is increased, whereas the performance of HfO2 based NCFETs is slightly degraded. In particular, the negative drain-induced barrier lowering and negative differential resistance vary considerably when compressive strain is applied to PZT-based NCFETs.
在这项工作中,我们报告了用于研究双轴应变铁电负电容场效应管(ncfet)性能的器件模拟。采用PbZr0.5 Ti0.5 O3 (PZT)和HfO2作为铁电材料,采用第一线原理法施加双轴应变。发现PZT和HfO2在双轴应变下负电容区表现出不同的变化趋势。双轴应变对PZT的NC影响较大,而HfO2对双轴应变的影响不如PZT。当不施加应变时,hfo2基ncfet表现出比pz2基ncfet更好的性能。然而,当压缩双轴应变增加时,pz2基ncfet的亚阈值斜率和导通电流得到改善,而HfO2基ncfet的性能略有下降。特别是,当压缩应变作用于pzt基ncfet时,负漏导势垒降低和负差分电阻变化很大。
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引用次数: 0
Effect of Defects on the Grain and Grain Boundary Strength in Polycrystalline Copper Thin Films 缺陷对多晶铜薄膜晶粒及晶界强度的影响
Ken Suzuki, Fang Yiqing, Yifan Luo, H. Miura
In this study, grain boundary quality in terms of order of atomic arrangement of electroplated copper thin films was evaluated by using the IQ (Image Quality) value obtained from an electron back-scatter diffraction (EBSD) method, and the grain and grain boundary strength was evaluated by applying micro tensile test. In addition, in order to investigate the relationship between the strength and grain boundary quality, molecular dynamics (MD) simulations were applied to analyze the deformation behavior of a bicrystal sample and its strength. The variation of the strength and deformation property were attributed to the higher defect density around grain boundaries than that in grains, which impeded the development of slip systems.
本研究利用电子背散射衍射(EBSD)方法获得的IQ (Image quality)值评价电镀铜薄膜原子排列顺序的晶界质量,并利用微拉伸试验评价镀层的晶粒和晶界强度。此外,为了研究强度与晶界质量之间的关系,应用分子动力学(MD)模拟分析了双晶样品的变形行为及其强度。强度和变形性能的变化主要是由于晶界周围缺陷密度高于晶内缺陷密度,阻碍了滑移体系的发展。
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引用次数: 1
Simulation of Quantum Current in Double Gate MOSFETs: Vortices in Electron Transport 双栅mosfet中量子电流的模拟:电子输运中的涡旋
Pratik B. Vyas, M. L. Van de Put, M. Fischetti
Quantum simulation of electronic transport in double gate (DG) field-effect transistors (FETs) and FinFETs is usually deemed to be required as the devices are scaled to the nanometer length-scale. Here, we present results obtained using a simulation program to model ballistic quantum transport in these devices. Our quantum simulations show the presence of quasi bound electronic states in the channel and Fano-interference phenomenon in the transport behavior of ultra-thin body (UTB) Si DG MOSFETs. Vortices in electron wavefunctions are also reported at energies at which transmission zeros (antiresonance) occur.
双栅极场效应晶体管(fet)和finfet中电子输运的量子模拟通常被认为是器件缩放到纳米长度尺度的必要条件。在这里,我们展示了使用模拟程序来模拟这些器件中的弹道量子输运的结果。我们的量子模拟显示了超薄体(UTB) Si DG mosfet的通道中存在准束缚电子态和输运行为中的fano干扰现象。电子波函数中的涡旋也在传输零点(反共振)发生的能量处被报道。
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引用次数: 1
期刊
2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD)
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