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2016 74th Annual Device Research Conference (DRC)最新文献

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Radiation hardened graphene field effect transistors 辐射硬化石墨烯场效应晶体管
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548423
Konstantinos Alexandrou, A. Masurkar, H. Edrees, J. Wishart, Y. Hao, Nicholas Petrone, J. Hone, I. Kymissis
Our work demonstrates that both encapsulation and an insulated gate are needed to effectively produce radiation hard GFETs. Our devices successfully mitigate detrimental radiation effects which consists a significant step towards enabling graphene-based electronic devices to be used for space, military, and other radiation sensitive applications.
我们的工作表明,封装和绝缘栅极都需要有效地产生辐射硬gfet。我们的设备成功地减轻了有害的辐射影响,这是使基于石墨烯的电子设备用于太空,军事和其他辐射敏感应用的重要一步。
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引用次数: 1
Stable switching of resistive random access memory on the nanotip array electrodes 电阻式随机存储器在纳米尖端阵列电极上的稳定开关
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548428
K. Tsai, Chih-Hsiang Ho, W. Chang, Jr-jian Ke, Elif S. Mungan, Yuh‐Lin Wang, Jr-hau He
We have demonstrated that ZnO resistive memory with a nanostructured substrate has great potential in improving ReRAM's RS characteristics. The electric field concentrated on nanotip structures is believed to play a crucial role for lowering Vf and Vset. The uniformity of the nanostructures is also important for the optimization of device performance, as well as improving the switching uniformity and reliability. Combining with the fact that fabrication process has low-cost merit with excellent stability and scalability, the nanotip array is highly attractive for cost-effective ReRAM applications and for the device miniaturization.
我们已经证明了纳米结构衬底的ZnO电阻性存储器在改善ReRAM的RS特性方面具有很大的潜力。集中在纳米针尖结构上的电场对降低Vf和Vset起着至关重要的作用。纳米结构的均匀性对于优化器件性能、提高开关的均匀性和可靠性也很重要。结合制造工艺成本低、稳定性好、可扩展性强的特点,纳米尖端阵列在具有成本效益的ReRAM应用和器件小型化方面具有很高的吸引力。
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引用次数: 0
Ultra-wide bandgap AlGaN channel MISFET with polarization engineered ohmics 具有极化工程欧姆的超宽带隙AlGaN通道MISFET
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548394
S. Bajaj, F. Akyol, S. Krishnamoorthy, Yuewei Zhang, A. Armstrong, A. Allerman, S. Rajan
We report on the first ultra-wide bandgap Al0.75Ga0.25N channel metal-insulator-semiconductor field-effect transistor (MISFET) with heterostructure engineered ohmic contacts. The large breakdown field of AlN (12 MV/cm) and the superior device figures of merit make wider bandgap AlGaN attractive for the next-generation RF power amplifiers and switches [1]. However, a critical challenge preventing advancement in high composition AlGaN-based devices is the high resistance of ohmic contacts, due to the large ionization energy of dopants and the low electron affinity of AlN, both of which increase tunneling barrier for electrons. In this work, we use reverse polarization-graded n++ AlGaN contact layers to achieve a record low contact resistance (Rc) of 0.3 Ω.mm to 75 nm thick n-Al0.75Ga0.25N channel, translating in a specific contact resistance (ρsp) of 1.9×10-6 Ω.cm2. We then demonstrate the first ultra-wide bandgap Al0.75Ga0.25N channel MISFET with gate-recessed structure, employing polarization-graded contacts and Atomic Layer Deposited Al2O3 as the gate-dielectric.
本文报道了第一种具有异质结构工程欧姆触点的超宽带隙Al0.75Ga0.25N沟道金属-绝缘体-半导体场效应晶体管(MISFET)。AlN的大击穿场(12 MV/cm)和优越的器件性能使得更宽带隙的AlGaN对下一代射频功率放大器和开关[1]具有吸引力。然而,阻碍高成分AlN基器件发展的关键挑战是欧姆接触的高电阻,这是由于掺杂剂的大电离能和AlN的低电子亲和力,两者都会增加电子的隧穿势垒。在这项工作中,我们使用反向极化梯度的n++ AlGaN接触层,实现了创纪录的低接触电阻(Rc) 0.3 Ω。mm至75nm厚的n-Al0.75Ga0.25N通道,转换成的比接触电阻(ρsp)为1.9×10-6 Ω.cm2。然后,我们展示了第一个具有栅极凹槽结构的超宽带隙Al0.75Ga0.25N沟道MISFET,采用极化渐变触点和原子层沉积Al2O3作为栅极电介质。
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引用次数: 1
A new approach for energy band engineering in flexible GaAs devices 柔性砷化镓器件能带工程的新方法
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548451
A. Alharbi, D. Shahrjerdi
Flexible electronics based on rigid conventional crystalline semiconductors such as silicon and compound semiconductors is emerging as a new class of technology. At present, the existing approaches for realizing flexible electronics from those materials have focused on maintaining the performance of the original device. Here, we demonstrate a new approach for tailoring the electronic and optoelectronic properties of high-performance flexible devices through strain engineering. In this work, we use flexible gallium arsenide (GaAs) devices as a model system. We show that layer transfer through substrate cracking with a pre-tensioned nickel film can be utilized for engineering the electronic band structure of flexible GaAs devices. We empirically and theoretically quantify the effect of the `engineered' residual strain on the electronic band structure in these flexible GaAs devices. Photoluminescence (PL) and quantum efficiency (QE) measurements indicate the widening of the GaAs energy bandgap due to the residual compressive strain. More importantly, our strain engineering method is universal and can be readily extended to other flexible material systems such as gallium nitride.
基于硅和化合物半导体等刚性传统晶体半导体的柔性电子技术正在成为一种新技术。目前,利用这些材料实现柔性电子器件的现有方法主要集中在保持原始器件的性能上。在这里,我们展示了一种通过应变工程来定制高性能柔性器件的电子和光电子特性的新方法。在这项工作中,我们使用柔性砷化镓(GaAs)器件作为模型系统。研究表明,利用预张紧镍薄膜通过衬底开裂进行层转移可用于柔性砷化镓器件的电子带结构工程。我们从经验和理论上量化了“工程”残余应变对这些柔性GaAs器件中电子能带结构的影响。光致发光(PL)和量子效率(QE)测量表明,由于残余压缩应变,砷化镓能带隙变宽。更重要的是,我们的应变工程方法是通用的,可以很容易地扩展到其他柔性材料系统,如氮化镓。
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引用次数: 0
A scalable non-electroformed memdiode for neuromorphic circuitry 用于神经形态电路的可伸缩非电形成记忆二极管
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548463
J. Shank, M. Tellekamp, W. Doolittle
An electronic device is introduced that exhibits rectification, hysteresis, and capacitance. These three properties replicate biological functionality useful in neuromorphic circuitry. A similar device operating on different physical mechanisms was previously demonstrated in 2013, but its fabrication required an electro-formation process that introduces difficulties scaling to high density circuitry [1]. The metal-insulator-metal (MIM) structures discussed herein exhibit rectification, hysteresis, and capacitance resulting from an intentionally high defect density as deposited with no post-fabrication treatment necessary.
介绍了一种具有整流、迟滞和电容性能的电子器件。这三个特性复制了在神经形态回路中有用的生物功能。2013年,类似的设备在不同的物理机制下运行,但其制造需要一个电形成过程,这给高密度电路带来了困难。本文讨论的金属-绝缘体-金属(MIM)结构表现出整流、迟滞和电容,这是由于有意沉积的高缺陷密度导致的,无需后处理。
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引用次数: 1
Numerical Fokker-Planck simulation of stochastic write error in spin torque switching with thermal noise 考虑热噪声的自旋转矩开关随机写入误差的Fokker-Planck数值模拟
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548462
Yunkun Xie, B. Behin-Aein, Avik W. Ghosh
Emerging spintronics and nanomagnetic devices have attracted a lot of attention due to their versatility, scalability and energy efficiency. Most spintronics applications require manipulation of nano-magnet in a fast and efficient way. Spin transfer torque (STT) effect[1] is so far the most studied and well demonstrated means to switch a nano-size magnetic. Compared to traditional switching scheme by magnetic field, STT provides a scalable solution to manipulate the magnetization of a nano-sized magnet. STT based memory spin transfer torque magnetic random access memory (STT-MRAM) and spin torque oscillator (STO) have been proposed and experimentally demonstrated[2, 3]. One issue accompanies magnetic switching is the thermal noise. Under room temperature the magnetic switching under STT is susceptible to thermal fluctuation and often results in a distribution in switching current/delay. In applications like STT based memory, its stochastic nature can cause read/write error. In the case of write operation, increasing applied current or switching time can effectively reduce write error but both quantities are limited by other considerations such as energy dissipation, junction breakdown and etc. This kind of trade-off is essential in device and application design. The aim of the work is to promote numerical Fokker-Planck based framework to study thermal effect in STT switching. The comparison between numerical Fokker-Planck approach and other methods are summarized. We have also investigated write error rate (WER) in STT switching with a focus on its `slope' which is related to the write margin but not so often discussed in literature.
新兴的自旋电子学和纳米磁性器件因其通用性、可扩展性和高能效而备受关注。大多数自旋电子学应用都需要快速有效地操纵纳米磁体。自旋传递转矩(STT)效应[1]是迄今为止研究最多、证明最充分的一种切换纳米级磁性材料的方法。与传统的磁场开关方案相比,STT提供了一种可扩展的解决方案来控制纳米级磁铁的磁化强度。基于STT的记忆自旋传递转矩磁随机存取存储器(STT- mram)和自旋转矩振荡器(STO)已经被提出并实验证明[2,3]。伴随磁开关的一个问题是热噪声。室温下,STT下的磁开关易受热波动影响,导致开关电流/延迟分布。在像基于STT的内存这样的应用程序中,其随机性会导致读/写错误。在写操作的情况下,增加施加的电流或开关时间可以有效地减少写错误,但这两个量都受到其他因素的限制,如能量消耗、结击穿等。这种权衡在设备和应用程序设计中是必不可少的。本工作的目的是推广基于Fokker-Planck的数值框架来研究STT开关中的热效应。总结了数值Fokker-Planck方法与其他方法的比较。我们还研究了STT切换中的写入错误率(WER),重点关注其“斜率”,这与写入余量有关,但在文献中不常讨论。
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引用次数: 5
Novel hydroxy-phenyl phosphorus porphyrin self-assembled monolayers for conformal n-type doping in Finfets 新型羟基苯基磷卟啉自组装单分子膜在Finfets中的适形n型掺杂
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548435
Tejas R. Naik, R. Krishnan, Priyanka Kumari, M. Ravikanth, V. Rao
A controllable and selective process for doping is essential for current CMOS technology, and with the advent of FinFETs, necessity for conformal doping has become inevitable. In this work, we demonstrate formation of novel phosphorus porphyrin self-assembled monolayers(SAMs) on silicon substrate to dope silicon with phosphorus (n-type doping). Detailed physical characterization of SAMs formed on silicon is done using contact angle, FTIR, UV-Vis, etc. The doping is confirmed using SIMS and four-probe measurement (sheet resistance). MISCAP devices, pn junction diodes using the above technique are fabricated and characterized using capacitance-voltage (CV) and current-voltage (IV) measurements. SAM layer is utilized for doping in 3D fin like structures.
可控和选择性的掺杂过程是当前CMOS技术的关键,随着finfet的出现,对适形掺杂的必要性已成为不可避免的。在这项工作中,我们证明了在硅衬底上形成新的磷卟啉自组装单层(SAMs),以掺杂磷(n型掺杂)。利用接触角、FTIR、UV-Vis等方法对在硅上形成的地对空导弹进行了详细的物理表征。使用SIMS和四探针测量(薄片电阻)证实了掺杂。MISCAP器件,pn结二极管使用上述技术制造和表征使用电容电压(CV)和电流电压(IV)测量。利用SAM层在三维鳍状结构中掺杂。
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引用次数: 2
Towards wafer scale monolayer MoS2 based flexible low-power RF electronics for IoT systems 面向物联网系统的基于单层MoS2的柔性低功耗射频电子器件
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548483
M. Yogeesh, Hsiao-Yu Chang, Wei Li, S. Rahimi, A. Rai, A. Sanne, R. Ghosh, S. Banerjee, D. Akinwande
There is a growing interest in the design of novel flexible electronics for future internet of things (IoT) systems [1]. IoT requires design of low power RF electronics operating at GHz frequency range. Molybdenum disulphide (MoS2) is the prototypical transitional metal dichalcogenide (TMD) affording a large semiconducting bandgap (1.8eV), high saturation velocity, good mechanical strength, high mobility (> 50cm2/Vs), high on/off ratio (> 106), good current saturation and GHz RF performance [2]. In this work, we demonstrate wafer scale monolayer MoS2 based flexible RF nanoelectronics that can be used for low power nanoelectronics and flexible IoT systems.
人们对未来物联网(IoT)系统的新型柔性电子设计越来越感兴趣。物联网需要设计在GHz频率范围内工作的低功率射频电子设备。二硫化钼(MoS2)是典型的过渡金属二硫化物(TMD),具有大的半导体带隙(1.8eV)、高饱和速度、良好的机械强度、高迁移率(> 50cm2/Vs)、高开/关比(> 106)、良好的电流饱和和GHz射频性能。在这项工作中,我们展示了基于晶圆级单层MoS2的柔性射频纳米电子学,可用于低功耗纳米电子学和柔性物联网系统。
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引用次数: 3
Electrically driven reversible insulator-metal phase transition in Ca2RuO4 Ca2RuO4中电驱动可逆绝缘体-金属相变
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7548402
N. Shukla, M. Jerry, H. Nair, M. Barth, D. Schlom, S. Datta
We have investigated the electrically induced IMT in Ca2RuO4 thin films whose transition temperature has been increased by >190 K (TIMT > 550K) using epitaxial strain engineering. We show using DC and transient I-V measurements that the electrically induced phase transition is electro-thermal in nature, and is driven by current induced self-heating.
采用外延应变工程技术研究了转变温度提高>190 K (TIMT > 550K)的Ca2RuO4薄膜的电致IMT。我们使用直流和瞬态I-V测量表明,电诱导相变本质上是电热的,并且是由电流诱导的自加热驱动的。
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引用次数: 2
Direct observation of power dissipation in monolayer MoS2 devices 直接观察单层MoS2器件的功耗
Pub Date : 2016-06-19 DOI: 10.1109/DRC.2016.7676130
E. Yalon, C. McClellan, K. Smithe, Y. C. Shin, R. Xu, E. Pop
We studied power dissipation in 1L MoS2 devices using Raman thermometry for the first time. We uncovered non-uniformities of power dissipation and the important role of the MoS2-substrate interface thermal resistance. These results provide critical insights for thermal design of devices based on 2D materials. This work was supported by the AFOSR, NSF EFRI 2-DARE, and Stanford SystemX.
本文首次利用拉曼测温技术研究了1L MoS2器件的功耗。我们发现了功耗的不均匀性以及mos2衬底界面热阻的重要作用。这些结果为基于二维材料的器件热设计提供了重要的见解。这项工作得到了AFOSR、NSF EFRI 2-DARE和Stanford SystemX的支持。
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引用次数: 5
期刊
2016 74th Annual Device Research Conference (DRC)
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