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Compact model for ballistic single wall CNTFET under quantum capacitance limit 被引量:1
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作者 Amandeep Singh Mamta Khosla Balwinder Raj 《Journal of Semiconductors》 EI CAS CSCD 2016年第10期48-55,共8页
This paper proposes a compact model for carbon nanotube field effect transistor(CNTFET) based on surface potential and conduction band minima. The proposed model relates the I–V characteristics to chirality under q... This paper proposes a compact model for carbon nanotube field effect transistor(CNTFET) based on surface potential and conduction band minima. The proposed model relates the I–V characteristics to chirality under quantum capacitance limit. C–V characteristics have been efficiently modelled for different capacitance models which are used to find the relationship between CNT surface potential and gate voltage. The role of different capacitances is discussed and it has been found that the proposed circuit compact model strictly follows quantum capacitance limit. The proposed model is efficiently designed for circuit simulations as it denies self-consistent numerical simulation. Furthermore, this compact model is compared with experimental results. The model has been used to simulate an inverter using HSPICE. 展开更多
关键词 carbon nanotube(CNT) device modelling ballistic CNTFET quantum capacitance
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Is quantum capacitance in graphene a potential hurdle for device scaling?
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作者 Jaeho Lee Hyun-Jong Chung +6 位作者 David H. Seo Jaehong Lee Hyungcheol Shin Sunae Seo Seongjun Park Sungwoo Hwang Kinam Kim 《Nano Research》 SCIE EI CAS CSCD 2014年第4期453-461,共9页
Transistor size is constantly being reduced to improve performance as well as power consumption. For the channel length to be reduced, the corresponding gate dielectric thickness should also be reduced. Unfortunately,... Transistor size is constantly being reduced to improve performance as well as power consumption. For the channel length to be reduced, the corresponding gate dielectric thickness should also be reduced. Unfortunately, graphene devices are more complicated due to an extra capacitance called quantum capacitance (CQ) which limits the effective gate dielectric reduction. In this work, we analyzed the effect of CQ on device-scaling issues by extracting it from scaling of the channel length of devices. In contrast to previous reports for metal-insulator- metal structures, a practical device structure was used in conjunction with direct radio-frequency field-effect transistor measurements to describe the graphene channels. In order to precisely extract device parameters, we reassessed the equivalent circuit, and concluded that the on-state model should in fact be used. By careful consideration of the underlap region, our device modeling was shown to be in good agreement with the experimental data. CQ contributions to equivalent oxide thickness were analyzed in detail for varying impurity concentrations in graphene. Finally, we were able to demonstrate that despite contributions from CQ, graphene's high mobility and low-voltage operation allows for ~raphene channels suitable for next generation transistors. 展开更多
关键词 GRAPHENE equivalent circuit quantum capacitance intrinsic delay
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Theoretical insights into the role of defects in the optimization of the electrochemical capacitance of graphene
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作者 Alex Aziz Wei Yu +3 位作者 Rui Tang Rachel Crespo-Otero Devis Di Tommaso Hirotomo Nishihara 《Energy Materials and Devices》 2024年第3期81-96,共16页
Graphene-based frameworks suffer from a low quantum capacitance due to graphene’s Dirac point at the Fermi level.This theoretical study investigated the effect structural defects,nitrogen and boron doping,and surface... Graphene-based frameworks suffer from a low quantum capacitance due to graphene’s Dirac point at the Fermi level.This theoretical study investigated the effect structural defects,nitrogen and boron doping,and surface epoxy/hydroxy groups have on the electronic structure and capacitance of graphene.Density functional theory calculations reveal that the lowest energy configurations for nitrogen or boron substitutional doping occur when the dopant atoms are segregated.This elucidates why the magnetic transition for nitrogen doping is experimentally only observed at higher doping levels.We also highlight that the lowest energy configuration for a single vacancy defect is magnetic.Joint density functional theory calculations show that the fixed band approximation becomes increasingly inaccurate for electrolytes with lower dielectric constants.The introduction of structural defects rather than nitrogen or boron substitutional doping,or the introduction of adatoms leads to the largest increase in density of states and capacitance around graphene’s Dirac point.However,the presence of adatoms or substitutional doping leads to a larger shift of the potential of zero charge away from graphene’s Dirac point. 展开更多
关键词 implicit solvent models electrical double layer joint density functional theory graphene based supercapacitors quantum capacitance
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Impact of barrier thickness on gate capacitance—modeling and comparative analysis of GaN based MOSHEMTs 被引量:2
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作者 Kanjalochan Jena Raghunandan Swain T.R.Lenka 《Journal of Semiconductors》 EI CAS CSCD 2015年第3期60-64,共5页
A mathematical model is developed predicting the behavior of gate capacitance with the nanoscale variation of barrier thickness in AlN/GaN MOSHEMT and its effect on gate capacitances of AIInN/GaN and AlGaN/GaN MOSHEMT... A mathematical model is developed predicting the behavior of gate capacitance with the nanoscale variation of barrier thickness in AlN/GaN MOSHEMT and its effect on gate capacitances of AIInN/GaN and AlGaN/GaN MOSHEMTs through TCAD simulations is compared analytically. AlN/GaN and AIInN/GaN MOSHEMTs have an advantage of a significant decrease in gate capacitance up to 108 fF/μm^2 with an increase in barrier thickness up to 10 nm as compared to conventional AlGaN/GaN MOSHEMT. This decrease in gate capacitance leads to improved RF performance and hence reduced propagation delay. 展开更多
关键词 2DEG GAN MOSHEMT quantum capacitance TCAD
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Electron-electron interactions in monolayer graphene quantum capacitors 被引量:1
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作者 Xiaolong Chen Lin Wang Wei Li Yang Wang Zefei Wu Mingwei Zhang Yu Han Yuheng He Ning Wang 《Nano Research》 SCIE EI CAS CSCD 2013年第8期619-626,共8页
We demonstrate the effects of electron-electron (e-e) interactions in monolayer graphene quantum capacitors. Ultrathin yttrium oxide showed excellent per-formance as the dielectric layer in top-gate device geometry.... We demonstrate the effects of electron-electron (e-e) interactions in monolayer graphene quantum capacitors. Ultrathin yttrium oxide showed excellent per-formance as the dielectric layer in top-gate device geometry. The structure and dielectric constant of the yttrium oxide layers have been carefully studied. The inverse compressibility retrieved from the quantum capacitance agreed fairly well with the theoretical predictions for the e--e interactions in monolayer graphene at different temperatures. We found that electron-hole puddles played a significant role in the low-density carrier region in graphene. By considering the temperature-dependent charge fluctuation, we established a model to explain the round-off effect originating from the e-e interactions in monolayer graphene near the Dirac point. 展开更多
关键词 GRAPHENE e-e interaction inverse compressibility quantum capacitance charge fluctuation electron-hole puddles
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Numerical study of the sub-threshold slope in T-CNFETs
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作者 周海亮 郝跃 张民选 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2010年第9期32-36,共5页
The most attractive merit of tunneling carbon nanotube field effect transistors(T-CNFETs) is the ultra-small inverse sub-threshold slope.In order to obtain as small an average sub-threshold slope as possible,several... The most attractive merit of tunneling carbon nanotube field effect transistors(T-CNFETs) is the ultra-small inverse sub-threshold slope.In order to obtain as small an average sub-threshold slope as possible,several effective approaches have been proposed based on a numerical insight into the working mechanism of T-CNFETs:tuning the doping level of source/drain leads,minimizing the quantum capacitance value via tuning the bias condition or increasing the insulator capacitance,and adopting a staircase doping strategy in the drain lead.Non-equilibrium Green's function based simulation results show that all these approaches can contribute to a smaller average inverse sub-threshold slope, which is quite desirable in high-frequency or low-power applications. 展开更多
关键词 sub-threshold slope T-CNFETs quantum capacitance BTBT NEGF
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