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Conference Digest [Includes 'Late News Papers' volume] Device Research Conference, 2004. 62nd DRC.最新文献

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A novel surface passivation process for HfO/sub 2/ Ge MOSFETs HfO/sub 2/ Ge mosfet表面钝化新工艺
N. Wu, Qingchun Zhang, Chunxiang Zhu, D. Chan, M. Li, N. Balasubramanian, A. Du, A. Chin, J. Sin, D. Kwong
This work presents a novel surface passivation process for HfO/sub 2/ Ge MOSFETs which we have developed, using in-situ SiH/sub 4/ treatment prior to HfO/sub 2/ deposition. Results show that, compared to conventional surface nitridation, TaN/HfO/sub 2//Ge pMOSFETs with in-situ SiH/sub 4/ surface treatment have much reduced frequency dispersion and hysteresis, improved gate leakage distribution, better subthreshold swing and higher hole mobility.
本工作提出了一种新的HfO/sub 2/ Ge mosfet表面钝化工艺,该工艺在HfO/sub 2/沉积之前使用原位SiH/sub 4/处理。结果表明,与传统表面氮化相比,原位SiH/sub - 4/表面处理的TaN/HfO/sub - 2//Ge pmosfet具有显著降低频散和迟滞的特性,改善栅极泄漏分布,改善亚阈值振荡,提高空穴迁移率。
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引用次数: 0
Nanoparticle floating gate flash memories 纳米粒子浮栅闪存
S. Banerjee, D. Kim, T. Kim, L. Weltzer, Y. Liu, S. Tang, M. Palard
This work presents the use of SiGe nanoparticle floating gates on high-k gate tunneling dielectrics, which, along with SiGe cold cathodes in the channel, are ways to enhance the low voltage/power operation of flash cells, improve the speed and charge retention. Control of dot sizes and spatial distributions may be improved by templated growth. Instead of an array of nanoparticles, it is also possible to use single quantum dots, and exploit Coulomb blockade and multi-level storage in single electron/few electron charge memories, but such devices are susceptible to background charges. It is possible to envision vertical cell structures in a cross-point array at the intersections of the wordlines and bitlines, which can result in an ideal 4F/sup 2/ architecture.
这项工作提出了在高k栅极隧道介质上使用SiGe纳米颗粒浮栅,它与通道中的SiGe冷阴极一起,是增强闪存电池的低压/功率操作,提高速度和电荷保留的方法。模版生长可以改善网点大小和空间分布的控制。代替纳米粒子阵列,也可以使用单量子点,利用库仑封锁和单电子/少电子电荷存储器中的多级存储,但这种设备容易受到背景电荷的影响。在字线和位线的交叉点阵列中设想垂直单元结构是可能的,这可以产生理想的4F/sup /架构。
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引用次数: 1
Study of subthreshold electron mobility behavior in SOI-MESFETs soi - mesfet中亚阈值电子迁移行为研究
T. Khan, D. Vasileska, T. Thornton
Micropower circuits based on sub-threshold MOSFETs are used in a variety of applications ranging from digital watches to medical implants. Alternate device structures are needed that will satisfy both the low-power and RF requirements and will allow much better operation of, for example, pacemakers. A candidate structure is the SOI-MESFET that is currently being fabricated and theoretically characterized within our Nanostructures Research Group at Arizona State University. Since the mobility is the key factor in determining the device cut-off frequency, it is the purpose of this study to investigate the electron mobility improvement of SOI MESFET when compared to SOI and conventional MOSFET devices. To accomplish this goal, we have utilized our in-house Ensemble Monte Carlo device simulator and performed extensive simulations of similar geometry SOI MOSFETs and Si MESFET channels.
基于亚阈值mosfet的微功率电路用于从数字手表到医疗植入物的各种应用。需要替代的设备结构,以满足低功耗和射频要求,并允许更好的操作,例如,起搏器。一种候选结构是SOI-MESFET,目前正在亚利桑那州立大学纳米结构研究小组进行制造和理论表征。由于迁移率是决定器件截止频率的关键因素,因此本研究的目的是研究与SOI和传统MOSFET器件相比,SOI MESFET的电子迁移率提高。为了实现这一目标,我们利用了我们内部的集成蒙特卡罗器件模拟器,并对类似几何形状的SOI mosfet和Si MESFET通道进行了广泛的模拟。
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引用次数: 1
Impact of reducing RTA temperature on sub-10nm ultra-thin body SOI 降低RTA温度对亚10nm超薄机身SOI的影响
Jong-Heon Yang, Jihun Oh, W. Cho, C. Ahn, K. Im, I. Baek, J. Park, Seongjae Lee
In this work, we fabricated sub-10 nm UTB SOI and investigated its properties by using plasma doping (PLAD) and rapid thermal annealing (RTA). It is shown, for the first time, that electrical properties and device scalability of the sub-10 nm thin body were improved with reduced RTA temperature. In scaling down, SOI thickness decreases, but also RTA temperature scaling should be considered. RTA temperature is directly connected to the suppression of the short-channel effect and also it gives more chance for device scalability, especially for sub-20 nm SOI devices.
本文采用等离子体掺杂(PLAD)和快速热退火(RTA)技术制备了亚10nm UTB SOI,并对其性能进行了研究。研究首次表明,随着RTA温度的降低,亚10nm薄体的电学性能和器件可扩展性得到改善。当缩尺减小时,SOI厚度减小,但也要考虑RTA温度的缩尺。RTA温度直接关系到短通道效应的抑制,也为器件的可扩展性提供了更多的机会,特别是对于sub- 20nm的SOI器件。
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引用次数: 0
SOI MOSFET-based quantum tunneling device - FIBTET 基于SOI mosfet的量子隧道器件
K. Kim, Hyun Ho Kim, Ki-Whan Song, J. Huh, J. Lee, Byung-Gook Park
We have previously reported the controllable complementary n- and p-type negative-differential transconductance (NDT) characteristics of a FIBTET (field-induced band-to-band tunneling effect transistor) on a degenerately doped SOI MOSFET. In this work, we investigate key parameters of device design and demonstrate negative-differential conductance (NDC) as well as NDT characteristics in FIBTETs, which have a structure totally compatible with SOI MOSFETs. the critical dose condition distinguishing FIBTET from MOSFET has been found and room temperature NDC as well as NDT was demonstrated in a SOI MOSFET compatible tunnel device. The NDC combined with NDT characteristics of FIBTETs will give room for various analog and digital circuit applications based on Si technology.
我们之前已经报道了在简并掺杂SOI MOSFET上的场致带对带隧道效应晶体管(fitet)的可控互补n型和p型负差分跨导(NDT)特性。在这项工作中,我们研究了器件设计的关键参数,并展示了fifiet的负差分电导(NDC)和NDT特性,其结构与SOI mosfet完全兼容。发现了区分fibet和MOSFET的临界剂量条件,并在SOI MOSFET兼容的隧道器件中演示了室温NDC和NDT。NDC结合fibet的无损检测特性,将为基于Si技术的各种模拟和数字电路应用提供空间。
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引用次数: 2
Velocity overshoot effects and transit times in III-V nitride HFETs : a Monte Carlo study III-V型氮化hfet的速度超调效应和传输时间:蒙特卡罗研究
M. Singh, Yuh‐Renn Wu, J. Singh
Monte Carlo simulation of AlGaN/GaN HEMTs were carried out and compared with GaAs based devices. The following outcomes of our simulations are noteworthy: i) partially due to the relatively heavy electron effective mass in GaN, the velocities of the electrons are mostly below the steady state values through most of the channel; ii) unlike what is observed in GaAs based short channel devices, there is no pronounced overshoot effect, even at high drain source biases, due to increased scattering; iii) our simulations show that the suppression of overshoot is directly related to the length of the high field region. This length is quite small for usual bias conditions. We suggest that a non-uniform composition of the barrier region could conceivably help in spreading out the high field region, which is present at the drain end of the device. Other results of the Monte Carlo simulation include transconductance, noise information and unity current gain frequency.
对AlGaN/GaN hemt进行了蒙特卡罗模拟,并与基于GaAs的器件进行了比较。我们的模拟结果值得注意:1)部分由于氮化镓中相对较重的电子有效质量,电子通过大部分通道的速度大多低于稳态值;ii)与在基于砷化镓的短通道器件中观察到的不同,由于散射增加,即使在高漏源偏置下,也没有明显的超调效应;Iii)我们的模拟表明,超调的抑制与高场区域的长度直接相关。这个长度对于通常的偏置条件是相当小的。我们建议,非均匀组成的势垒区域可能有助于扩散高场区域,这是存在于器件的漏极。蒙特卡罗仿真的其他结果包括跨导、噪声信息和单位电流增益频率。
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引用次数: 0
280 GHz f/sub T/ InP DHBT with 1.2 /spl mu/m/sup 2/ base-emitter junction area in MBE regrown-emitter technology 在MBE再生发射极技术中,具有1.2 /spl mu/m/sup 2/基极-发射极结面积的280 GHz f/sub T/ InP DHBT
Yun Wei, D. Scott, Yingda Dong, A. Gossard, M. Rodwell
We report an InP/InGaAs/InP double heterojunction bipolar transistor (DHBT) with a 0.3 /spl mu/m/spl times/4 /spl mu/m regrown base-emitter junction. The HBT exhibits a 280 GHz current gain cutoff frequency (f/sub /spl tau//) and 148 GHz power gain cutoff frequency (f/sub max/). This DHBT was fabricated in a molecular beam epitaxy (MBE) regrown-emitter technology and has the highest f/sub /spl tau// yet reported for a III-V regrown-emitter HBT. The device has V/sub CE.sat/<0.9 V even at J/sub E/=11 mA //spl mu/m/sup 2/, peak AC current gain h/sub 21/=30, and collector breakdown voltage V/sub CEO/=5 V. In this technology, the area of base-emitter junction has been scaled to as small as 1.2 /spl mu/m/sup 2/ while a larger-area extrinsic emitter contact maintains a low 11 /spl Omega/ emitter access resistance.
我们报道了一种InP/InGaAs/InP双异质结双极晶体管(DHBT),具有0.3 /spl mu/m/spl乘以/4 /spl mu/m的再生基极-发射极结。HBT具有280 GHz电流增益截止频率(f/sub /spl tau//)和148 GHz功率增益截止频率(f/sub max/)。该DHBT采用分子束外延(MBE)再生发射极技术制备,其f/sub /spl tau//是目前报道的III-V型再生发射极HBT中最高的。在J/sub E/=11 mA //spl mu/m/sup 2/,交流峰值电流增益h/sub 21/=30,集电极击穿电压V/sub CEO/=5 V时,器件的V/sub CE.sat/<0.9 V。在这项技术中,基极-发射极结的面积被缩小到1.2 /spl mu/m/sup /,而更大面积的外部发射极接触保持了较低的11 /spl ω /发射极接入电阻。
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引用次数: 1
A low-temperature Si/SiGe impact diode for improved infrared sensing 用于改进红外传感的低温Si/SiGe冲击二极管
J. Meteer, S. Eikenberry, J. Huffman, E. Kan
Si/SiGe quantum well (QW) impact diodes are demonstrated with multiplication up to 200 at 10 V reverse bias between 10-150 K. These diodes are ideal gain structures for use with Si impurity band conduction (IBC) infrared detectors, due to the available integration platform, appropriate low temperature characteristics, low voltage operation, and low noise multiplication mechanism as required for compatibility with mid- and far infrared detection. Physical characterization, including composition and doping profiles, are obtained from STEM and SIMS analyses. Photocurrent multiplication is measured to confirm our device design.
Si/SiGe量子阱(QW)冲击二极管在10-150 K之间的10 V反向偏置下倍增高达200。这些二极管是用于Si杂质带导(IBC)红外探测器的理想增益结构,由于可用的集成平台,适当的低温特性,低电压工作和低噪声倍增机制,以兼容中红外和远红外探测。物理表征,包括成分和掺杂谱,通过STEM和SIMS分析获得。通过测量光电流倍增来验证我们的器件设计。
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引用次数: 0
Ion implantation for unalloyed ohmic contacts to AlGaN/GaN HEMTs 非合金欧姆接触对AlGaN/GaN hemt的离子注入
H. Yu, L. McCarthy, S. Rajan, S. Keller, S. Denbaars, J. Speck, U. Mishra
We report on the use of Si ion implantation for the fabrication of AlGaN/GaN HEMTs with an as-deposited ohmic contact resistance of 0.4 /spl Omega/mm. Currently ohmic contact technology requires a high temperature (/spl sim/870/spl deg/C) alloying step. The resulting contacts have an irregular shape and surface that can create difficulties in device reproducibility, reliability and yield, particularly for large periphery devices. The use of ion implantation to enable unalloyed ohmic contacts has the potential to reduce these obstacles to the manufacturability of AlGaN/GaN HEMTs. Using ion implantation also has the potential to reduce access resistance by reducing ohmic contact resistance and gate-source spacing, to eliminate the need for etched device isolation, and to enable sophisticated device designs that take advantage of lateral dopant engineering.
我们报道了使用硅离子注入制备AlGaN/GaN hemt,其沉积欧姆接触电阻为0.4 /spl ω /mm。目前欧姆接触技术需要高温(/spl sim/870/spl℃)合金化步骤。由此产生的触点具有不规则的形状和表面,这可能会给设备的再现性、可靠性和成品率带来困难,特别是对于大型外围设备。使用离子注入实现非合金欧姆接触有可能减少这些阻碍AlGaN/GaN hemt可制造性的障碍。使用离子注入也有可能通过减小欧姆接触电阻和栅极源间距来降低接入电阻,消除对蚀刻器件隔离的需求,并使利用横向掺杂工程的复杂器件设计成为可能。
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引用次数: 2
50 GHz resonant tunneling diode relaxation oscillator 50 GHz谐振隧道二极管弛豫振荡器
P. Chahal, F. Morris, G. Frazier
InAlAs/AlAs based RTDs with a peak current density over 500 kA/cm/sup 2/ have been designed and fabricated. Relaxation oscillator circuits for 20 and 50 GHz were designed using these 0.6 /spl mu/m/sup 2/ RTDs. They consist of an RTD and a 5 /spl Omega/ resistor placed in a coplanar waveguide (CPW). The measured spectrum of the 20 GHz and 50 GHz oscillators showed only odd harmonics. The measured results of the relaxation oscillators show that they have very low phase noise (low jitter), below -110 dBc/Hz at 1 MHz offset in locked-mode, and can easily be phase locked. RTD based relaxation oscillation can be readily used as clocks in high-speed signal processing applications.
已经设计和制造了峰值电流密度超过500 kA/cm/sup / 2/的基于InAlAs/AlAs的rtd。利用这些0.6 /spl mu/m/sup / rtd设计了20和50 GHz的弛豫振荡器电路。它们由一个RTD和一个放置在共面波导(CPW)中的5 /spl ω /电阻组成。20 GHz和50 GHz振荡器的测量频谱显示只有奇次谐波。弛豫振荡器的测量结果表明,它们具有非常低的相位噪声(低抖动),在锁定模式下,在1 MHz偏移时低于-110 dBc/Hz,并且很容易被锁相。基于RTD的弛豫振荡可以很容易地用作高速信号处理应用中的时钟。
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引用次数: 6
期刊
Conference Digest [Includes 'Late News Papers' volume] Device Research Conference, 2004. 62nd DRC.
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