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2018 4th IEEE International Conference on Emerging Electronics (ICEE)最新文献

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Flexural and bending fatigue studies of perovskite solar cells on Willow Glass substrates 柳树玻璃基板上钙钛矿太阳能电池的弯曲和弯曲疲劳研究
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8938024
A. D. Rao, S. S, V. Adiga, S. Garner, U. K. Pandey, Sanchita Sengupta, Praveen C Ramamurthy
Perovskite based photovoltaic (PV) devices have gained enormous importance due to their high power conversion efficiencies and ease of fabrication (solution processing). Conventionally, flexible solar cells have been reported on substrates like PET and PEN. Corning® Willow® Glass, owing to its superior processability and oxygen and moisture barrier property, is a potential replacement for these substrates. In this work, devices fabricated on Willow Glass substrates have been subjected to bending and fatigue tests to assess their worthiness as substrates for flexible solar cells.
钙钛矿基光伏(PV)器件由于其高功率转换效率和易于制造(溶液加工)而获得了巨大的重要性。传统上,柔性太阳能电池已被报道在PET和PEN等衬底上。康宁®柳树®玻璃,由于其优越的可加工性和氧气和水分阻隔性能,是这些基材的潜在替代品。在这项工作中,在柳树玻璃基板上制造的设备进行了弯曲和疲劳测试,以评估其作为柔性太阳能电池基板的价值。
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引用次数: 0
Controlling the Morphology and Conductivity of Thiophene Nanofibers using Electrospinning for Flexible devices 用静电纺丝控制柔性器件中噻吩纳米纤维的形态和电导率
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937946
K. Khanum, Shweta Shekar, Praveen C Ramamurthy
The effect of morphology and the ability to maneuver the morphology to improve the conductivity of a polymer blend is the aim of this study. An electrospinning method has been used to maneuver the morphology and to obtain unique millipede-like structures of poly (ethylene oxide) PEO and poly (thiophene-benzothiadiazole-thiophene) [poly (Th-BT-Th)] blended in the ratios of 1:1, 1:2 and 2:1. The blend is electrospun at varying applied voltage and collector distance. The morphology of these structures was optimized and controlled to obtain aligned fibers with Poly (Th-BT-Th) crystallites arranged perpendicular to the PEO nanofibers. Furthermore, morphological, structural, electrical properties and application in electronic devices is evaluated. Thus, an approach to impart flexibility and enhance surface area for volatile-organic-compound sensors has been presented.
形态的影响和操纵形态的能力,以提高聚合物共混物的导电性是本研究的目的。采用静电纺丝法对聚环氧乙烷PEO和聚噻吩-苯并噻唑-噻吩[聚Th-BT-Th]]按1:1、1:2和2:1的比例混合得到了独特的千足虫状结构。在不同的施加电压和集电极距离下进行电纺丝。对这些结构的形貌进行了优化和控制,得到了垂直于PEO纳米纤维排列的Poly (Th-BT-Th)晶体。此外,还对其形态、结构、电学性能及其在电子器件中的应用进行了评价。因此,提出了一种赋予挥发性有机化合物传感器灵活性和增加表面积的方法。
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引用次数: 0
Observation of visible light flashes in high power near infrared narrow linewidth polarization maintained fiber laser caused by Stimulated Brillouin Scattering triggered cascaded Raman Scattering 观察高功率近红外窄线宽偏振维持光纤激光器中受激布里渊散射引发的级联拉曼散射引起的可见光闪烁
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937970
Vishal Choudhury, Santosh Aparanji, Roopa Prkash, Balaswamy Velpula, V. Supradeepa
We report a surprising observation of visible light flashes in the fusion splice point between the seed stage to the power amplifier in a 500 W narrow-linewidth, polarisation-maintaining Ytterbium-doped fiber laser. The flashes were observed to have a strong correlation with the backward pulses generated due to the onset of Stimulated Brillouin Scattering (SBS) in the laser. We believe these visible flashes appear as a result of second harmonic generation of higher order Raman Stokes components of the 1064nm laser signal. The Raman components are generated by the back-propagating, high peak power SBS pulses at threshold. The Raman Stokes in the core of the fiber generates their respective second harmonic counterparts in the cladding through a Cherenkov-type phase matching process.
本文报道了在500w窄线宽保偏掺镱光纤激光器中,在种子级和功率放大器之间的融合接点处观察到可见光闪烁的惊人现象。这些闪光与激光中受激布里渊散射(SBS)产生的反向脉冲有很强的相关性。我们认为这些可见闪光是1064nm激光信号的高阶拉曼斯托克斯分量的二次谐波产生的结果。拉曼分量是由阈值处反向传播的高峰值功率SBS脉冲产生的。光纤核心的拉曼斯托克斯通过切伦科夫型相位匹配过程在包层中产生各自的二次谐波对应。
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引用次数: 1
Compact Modeling of Differential Spin-Orbit Torque based MRAM 基于自旋-轨道微分转矩的MRAM紧凑建模
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937873
S. Shreya, B. Kaushik
Magnetic tunnel junction (MTJ) is the basic storage component of magnetic random access memory (MRAM). In recent years, many structures such as in-plane MTJ, perpendicular magnetic anisotropy MTJ (pMTJ), spin transfer torque MTJ (STT-MTJ), spin-orbit torque MTJ (SOTMTJ), and complementary MTJ (cMTJ) are reported. Different structures and behavior are subject to the choice of anisotropy, switching mechanism and/or geometry of MTJ. This paper presents a compact modeling of differential spin-orbit torque (DSOT) based MRAM. Two structures serial DSOT and parallel DSOT are presented. Compact modeling using VerilogA is presented and device performance is reported. The results show an improvement in write energy and delay by 50% and 3.2 times respectively as compared to the single ended SOT device. In addition, it illustrates that serial DSOT structure is more energy efficient than parallel DSOT. The SPICE-based DSOT model can be useful for many high-performance hybrid spintronics/CMOS applications.
磁隧道结(MTJ)是磁随机存储器(MRAM)的基本存储部件。近年来,人们报道了平面内MTJ、垂直磁各向异性MTJ (pMTJ)、自旋传递扭矩MTJ (STT-MTJ)、自旋轨道扭矩MTJ (SOTMTJ)和互补MTJ (cMTJ)等结构。不同的结构和行为取决于MTJ的各向异性、开关机制和/或几何形状的选择。提出了一种基于MRAM的自旋-轨道微分扭矩(DSOT)的紧凑建模方法。提出了串行DSOT和并行DSOT两种结构。提出了使用VerilogA进行紧凑建模的方法,并报告了器件的性能。结果表明,与单端SOT器件相比,写入能量和延迟分别提高了50%和3.2倍。此外,它还说明了串行DSOT结构比并行DSOT更节能。基于spice的DSOT模型可用于许多高性能混合自旋电子学/CMOS应用。
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引用次数: 4
Bistability and Self-Pulsation in Free-carrier Driven Optical Microcavities with All Nonlinear Losses 具有全部非线性损耗的自由载流子驱动光学微腔的双稳性和自脉动
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937894
R. Haldar, Arkadev Roy, S. Varshney
Continuous-wave pumped micro-optical resonators have been vastly exploited to produce frequency comb (FC) utilizing Kerr effect. Most of the materials used to build photonic platforms exhibit nonlinear losses such as, multi-photon absorption, free-carrier absorption and free-carrier dispersion which can strongly affect the nonlinear characteristics of the devices viz. micro-resonators. In this work, we have developed analytical formulation to make quick estimation of the steady-state behavior, optical bistability, and self-pulsation phenomena in presence of nonlinear losses. Higher-order $(gt 3)$ characteristic polynomial of intra-cavity power describing the steady-state homogeneous solution of the modified Lugiato Lefever Equation are discussed in detail. We derive the generalized analytical expressions for the threshold of normalized pump detuning to initiate the optical bistability, a necessary condition for the FC generation.
连续波泵浦微光谐振器已被广泛应用于利用克尔效应产生频率梳(FC)。大多数用于构建光子平台的材料都存在非线性损耗,如多光子吸收、自由载流子吸收和自由载流子色散,这些损耗会严重影响微谐振器器件的非线性特性。在这项工作中,我们开发了分析公式来快速估计存在非线性损失的稳态行为,光学双稳性和自脉动现象。详细讨论了描述修正Lugiato Lefever方程稳态齐次解的腔内功率的高阶特征多项式。我们导出了归一化泵浦失谐启动光双稳性阈值的广义解析表达式,光双稳性是FC产生的必要条件。
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引用次数: 0
Simulation of Self-Heating and Bulk Trapping Effects on Drain Current Static and Transient Characteristics of AlGaN/GaN HEMTs AlGaN/GaN hemt的自热和体积捕集效应对漏极电流静态和瞬态特性的模拟
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937897
P. Raja, N. Dasgupta, A. DasGupta
Numerical device simulation studies of self-heating, buffer and barrier layer trapping effects on drain current characteristics of AlGaN/GaN high-electron mobility transistors (HEMTs) are carried out under static and dynamic operation modes. In simulation model, a buffer layer trap at $mathrm{E}_{C} -0.5$ eV, a barrier layer trap at $mathrm{E}_{C} -0.45$ eV, and self-heating effects are considered. The simulation results are validated with the measured data. The changes in the $mathrm{I}_{D}-mathrm{V}_{D}$ and $mathrm{I}_{D}-mathrm{V}_{G}$ characteristics at different trap concentrations $(10^{16}-10^{18}$ cm$^{-3})$ are predicted. The drain-lag turn-on transient simulations are performed to study the dynamic performance of the HEMTs. The self-heating effect on the drain current transient response is analyzed. To estimate the time constant of the trapping phenomena, transient characteristics are simulated by excluding self-heating effects. Similarly, the effect of trap density $(10^{16}-10^{18}$ cm$^{-3})$ on the transient response is reported and also transient characteristics are obtained at different trap energies $(mathrm{E}_{C} -0.1$ eV to $mathrm{E}_{C} -1.0$ eV). Simulation results reveal that the drop in the drain current under transient is mainly caused due to the channel temperature rise, whereas the magnitude of the transient current is affected by the buffer trap concentration.
在静态和动态两种工作模式下,对AlGaN/GaN高电子迁移率晶体管(HEMTs)的自加热、缓冲和势垒层捕获效应进行了数值模拟研究。在仿真模型中,考虑了$ mathm {E}_{C} -0.5$ eV的缓冲层陷阱,$ mathm {E}_{C} -0.45$ eV的势垒层陷阱和自热效应。仿真结果与实测数据相吻合。预测了不同捕集剂浓度$(10^{16}~ 10^{18}$ cm$^{-3})$下$ mathm {I}_{D}- $ mathm {V}_{D}$和$ mathm {I}_{D}- $ mathm {V}_{G}$特性的变化。通过漏阻导通瞬态仿真研究了hemt的动态性能。分析了自热对漏极电流瞬态响应的影响。为了估计捕获现象的时间常数,通过排除自热效应来模拟瞬态特性。同样,我们也报道了阱密度$(10^{16}-10^{18}$ cm$^{-3})$对瞬态响应的影响,并得到了不同阱能量$(mathrm{E}_{C} -0.1$ eV至$mathrm{E}_{C} -1.0$ eV)时的瞬态特性。仿真结果表明,瞬态漏极电流的下降主要是由通道温度升高引起的,而瞬态电流的大小受缓冲阱浓度的影响。
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引用次数: 2
Investigation of Trap Induced Gate Lag Phenomenon in AlGaN/GaN High Electron Mobility Transistors 氮化镓/氮化镓高电子迁移率晶体管中阱致栅极滞后现象的研究
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8938017
K. De, Gourab Dutta
The gate-lag phenomenon in AlGaN/GaN High Electron Mobility Transistors (HEMTs) is analyzed using two-dimensional TCAD simulation. Drain current (ID) transient method is used to analyze the consequence of gate lag. Effect of donor states present at AlGaN surface and acceptor type traps in bulk GaN is investigated in detail. It was found that the contributions of both donor and acceptor type traps should be taken into consideration for obtaining the simulated ID transient similar to the experimental results. Effects of energy level and concentration of traps, and applied OFF-state bias stresses on the gate lag phenomenon in AlGaN/GaN HEMTs are also investigated. This paper also provides a detailed explanation of gate lag transient characteristics for over 10 decades of time.
利用二维TCAD仿真分析了AlGaN/GaN高电子迁移率晶体管(hemt)中的栅极滞后现象。利用漏极电流暂态法分析了栅极滞后的影响。详细研究了氮化镓表面供体态和体氮化镓中受体型陷阱的影响。研究发现,为了获得与实验结果相似的模拟内径瞬态,应同时考虑施主型陷阱和受主型陷阱的贡献。本文还研究了陷阱能级和浓度以及外加的off态偏置应力对AlGaN/GaN hemt中栅极滞后现象的影响。本文还提供了超过10年时间的门滞后暂态特性的详细解释。
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引用次数: 8
Benzimidazole/reduced graphene oxide based field effect transistor for mercury ion detection in water 苯并咪唑/还原氧化石墨烯基场效应晶体管用于水中汞离子检测
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937865
S. Ramakrishnan, D.Vinod Kumar, H. Nagarajaiah, S. Saravanan, Praveen C Ramamurthy
Benzimidazole based derivate [2-(4,7-di(thiophen-2-yl)-1H-benzo[d]imidazol-2-yl)-6-hydroxymethyl)-4-methylphenol (BI) modified reduced graphene oxide (BI-RGO) was prepared by simple non-covalent functionalization. Analytical spectroscopy by (Fourier transform infrared, UV-Visible and Raman) revealed the modification has occurred by RGO with BI through $pi$–$pi$ interaction. The Photoluminescence spectrum shows that BIRGO has 18% quenching compared to neat BI derivatives. UV-Visible and PL Spectrum reveals the electronic and optical properties of the BI and the changes that occurs after functionalization. Raman and FTIR spectrum of the compounds also revealed the presence of different functional groups and structural configuration. RGO and RGO-BI which provides all the details for further study regarding sensor applications.
采用简单非共价功能化方法制备了苯并咪唑衍生物[2-(4,7-二(噻吩-2-基)- 1h -苯并[d]咪唑-2-基)-6-羟甲基)-4-甲基苯酚(BI)]修饰的还原氧化石墨烯(BI- rgo)。傅里叶变换红外光谱、紫外-可见光谱和拉曼光谱分析表明,RGO与BI通过$pi$ - $pi$相互作用发生了改性。光致发光光谱显示,与纯BI衍生物相比,BIRGO猝灭率为18%。紫外-可见光谱和PL光谱揭示了BI的电子和光学性质以及功能化后发生的变化。化合物的拉曼光谱和红外光谱也显示了不同官能团和结构构型的存在。RGO和RGO- bi,为进一步研究传感器应用提供了所有细节。
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引用次数: 0
Silicon Slot Waveguide Mach-Zehnder Using Fixed Electron Beam Moving Stage Patterning Technique 基于固定电子束移动阶段图形技术的硅槽波导马赫-曾德尔
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937940
V. Mere, S. Selvaraja
We demonstrate a fixed electron beam (e-beam) moving stage patterned photonics integrated circuit on Silicon-on-insulator platform. The circuit demonstrator consists of power splitter/combiner, wire-to-slot couplers, bend waveguide, and wire waveguides. We present a slot Mach-Zehnder interferometer (MZI) in 1550 nm band with efficient slot mode excitation. We verify slot mode excitation using numerical calculation.
在绝缘体上硅平台上设计了一种固定电子束移动台图案化光子集成电路。电路演示器由功率分配器/合并器、线槽耦合器、弯曲波导和线波导组成。在1550nm波段设计了一种高效的槽型马赫-曾德尔干涉仪(MZI)。我们用数值计算验证了槽型激励。
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引用次数: 0
A Physics Based Model for DC Self-Heating in Nanowire-FET Considering Lattice Temperature 考虑晶格温度的纳米线场效应管直流自热物理模型
Pub Date : 2018-12-01 DOI: 10.1109/icee44586.2018.8937983
Manoj Kumar, A. Bansal, K. Aditya, Charu Gupta, Anshul Gupta, A. Dixit
In this paper, a unified physics based 2-D analytical model for DC self-heating in Nanowire-FET is presented for the first time. The carrier and lattice-temperatures are considered in the model to include the effect of self-heating in Nanowire-FET. The model uses superposition approach to solve 2-D Poisson’s equation capturing the electrostatic potential of the device while the energy balance equation and temperature dependent mobility equation captures the effect of increased lattice temperature. By obtaining a good agreement with calibrated 3-D Sentaurus-TCAD electro-thermal simulations, the accuracy of the developed model is validated.
本文首次建立了基于统一物理的纳米线场效应管直流自热的二维解析模型。模型中考虑了载流子温度和晶格温度,考虑了纳米线场效应管的自热效应。该模型采用叠加法求解捕获器件静电势的二维泊松方程,而能量平衡方程和温度相关迁移率方程捕获晶格温度升高的影响。通过与经标定的三维Sentaurus-TCAD电热仿真结果的比较,验证了所建模型的准确性。
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引用次数: 0
期刊
2018 4th IEEE International Conference on Emerging Electronics (ICEE)
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