A Ⅲ-Ⅴ heterojunction tunneling field-effect transistor(TFET) can enhance the on-state current effectively,and GaAsSb/InGaAs heterojunction exhibits better performance with the adjustable band alignment by modulating...A Ⅲ-Ⅴ heterojunction tunneling field-effect transistor(TFET) can enhance the on-state current effectively,and GaAsSb/InGaAs heterojunction exhibits better performance with the adjustable band alignment by modulating the alloy composition.In this paper,the performance of the cylindrical surrounding-gate GaAsSb/InGaAs heterojunction TFET with gate-drain underlap is investigated by numerical simulation.We validate that reducing drain doping concentration and increasing gate-drain underlap could be effective ways to reduce the off-state current and subthreshold swing(SS),while increasing source doping concentration and adjusting the composition of GaAsSbInGaAs can improve the on-state current.In addition,the resonant TFET based on GaAsSb/InGaAs is also studied,and the result shows that the minimum and average of SS reach 11 mV/decade and 20 mV/decade for five decades of drain current,respectively,and is much superior to the conventional TFET.展开更多
The tunneling field-effect transistor（TFET） is a potential candidate for the post-CMOS era.In this paper,a threshold voltage model is developed for this new kind of device.First,two-dimensional（2D） models are used...The tunneling field-effect transistor（TFET） is a potential candidate for the post-CMOS era.In this paper,a threshold voltage model is developed for this new kind of device.First,two-dimensional（2D） models are used to describe the distributions of potential and electric field in the channel and two depletion regions.Then based on the physical definition of threshold voltage for the nanoscale TFET,the threshold voltage model is developed.The accuracy of the proposed model is verified by comparing the calculated results with the 2D device simulation data.It has been demonstrated that the effects of varying the device parameters can easily be investigated using the model presented in this paper.This threshold voltage model provides a valuable reference to TFET device design,simulation,and fabrication.展开更多
研究了一种新型非对称栅隧穿场效应晶体管(AG-TFET),新型结构结合了隧穿场效应晶体管陡峭的亚阈值摆幅与无结器件较大的开态电流的优点,其总电流大小受控于底部沟道势垒和p+区与本征沟道区形成的反偏p-i隧穿结处的带隙宽度以及电场强度...研究了一种新型非对称栅隧穿场效应晶体管(AG-TFET),新型结构结合了隧穿场效应晶体管陡峭的亚阈值摆幅与无结器件较大的开态电流的优点,其总电流大小受控于底部沟道势垒和p+区与本征沟道区形成的反偏p-i隧穿结处的带隙宽度以及电场强度。使用Silvaco TCAD软件对器件性能进行了仿真,并对p+区厚度以及底栅栅介质二氧化铪的长度进行了优化。仿真结果表明:新型AG-TFET具有良好的电学特性,在室温下开关电流比可以达到3.3×1010,开态电流为302μA/μm,陡峭的亚阈值摆幅即点亚阈值摆幅为35 m V/dec,平均亚阈值摆幅为54 m V/dec。因此,该新型AG-TFET有望被应用在未来低功耗电路中。展开更多
The present work gives some insight into the subthreshold behaviour of short-channel double-material- gate strained-silicon on silicon-germanium MOSFETs in terms of subthreshold swing and off-current. The formu- latio...The present work gives some insight into the subthreshold behaviour of short-channel double-material- gate strained-silicon on silicon-germanium MOSFETs in terms of subthreshold swing and off-current. The formu- lation of subthreshold current and, thereupon, the subthreshold swing have been done by exploiting the expression of potential distribution in the channel region of the device. The dependence of the subthreshold characteristics on the device parameters, such as Ge mole fraction, gate length ratio, work function of control gate metal and gate length, has been tested in detail. The analytical models have been validated by the numerical simulation results that were obtained from the device simulation software ATLASTM by Silvaco Inc.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61176038 and 61474093)the Science and Technology Planning Project of Guangdong Province,China(Grant No.2015A010103002)the Technology Development Program of Shaanxi Province,China(Grant No.2016GY-075)
文摘A Ⅲ-Ⅴ heterojunction tunneling field-effect transistor(TFET) can enhance the on-state current effectively,and GaAsSb/InGaAs heterojunction exhibits better performance with the adjustable band alignment by modulating the alloy composition.In this paper,the performance of the cylindrical surrounding-gate GaAsSb/InGaAs heterojunction TFET with gate-drain underlap is investigated by numerical simulation.We validate that reducing drain doping concentration and increasing gate-drain underlap could be effective ways to reduce the off-state current and subthreshold swing(SS),while increasing source doping concentration and adjusting the composition of GaAsSbInGaAs can improve the on-state current.In addition,the resonant TFET based on GaAsSb/InGaAs is also studied,and the result shows that the minimum and average of SS reach 11 mV/decade and 20 mV/decade for five decades of drain current,respectively,and is much superior to the conventional TFET.
基金Supported by the National Natural Science Foundation of China (61822407,62074161,62004213)the National Key Research and Development Program of China under (2018YFE0125700)。
基金This work is supported by the National High Technology Research and Development Program of China(No.2014 AA 032606)and the National Natural Sciences Foundation of China(No.61376090,61306008).
基金Project supported by the National Ministries and Commissions,China (Grant Nos. 51308040203 and 6139801)the Fundamental Research Funds for the Central Universities,China (Grant Nos. 72105499 and 72104089)the Natural Science Basic Research Plan in Shaanxi Province,China (Grant No. 2010JQ8008)
文摘The tunneling field-effect transistor（TFET） is a potential candidate for the post-CMOS era.In this paper,a threshold voltage model is developed for this new kind of device.First,two-dimensional（2D） models are used to describe the distributions of potential and electric field in the channel and two depletion regions.Then based on the physical definition of threshold voltage for the nanoscale TFET,the threshold voltage model is developed.The accuracy of the proposed model is verified by comparing the calculated results with the 2D device simulation data.It has been demonstrated that the effects of varying the device parameters can easily be investigated using the model presented in this paper.This threshold voltage model provides a valuable reference to TFET device design,simulation,and fabrication.
文摘研究了一种新型非对称栅隧穿场效应晶体管(AG-TFET),新型结构结合了隧穿场效应晶体管陡峭的亚阈值摆幅与无结器件较大的开态电流的优点,其总电流大小受控于底部沟道势垒和p+区与本征沟道区形成的反偏p-i隧穿结处的带隙宽度以及电场强度。使用Silvaco TCAD软件对器件性能进行了仿真,并对p+区厚度以及底栅栅介质二氧化铪的长度进行了优化。仿真结果表明:新型AG-TFET具有良好的电学特性,在室温下开关电流比可以达到3.3×1010,开态电流为302μA/μm,陡峭的亚阈值摆幅即点亚阈值摆幅为35 m V/dec,平均亚阈值摆幅为54 m V/dec。因此,该新型AG-TFET有望被应用在未来低功耗电路中。
文摘The present work gives some insight into the subthreshold behaviour of short-channel double-material- gate strained-silicon on silicon-germanium MOSFETs in terms of subthreshold swing and off-current. The formu- lation of subthreshold current and, thereupon, the subthreshold swing have been done by exploiting the expression of potential distribution in the channel region of the device. The dependence of the subthreshold characteristics on the device parameters, such as Ge mole fraction, gate length ratio, work function of control gate metal and gate length, has been tested in detail. The analytical models have been validated by the numerical simulation results that were obtained from the device simulation software ATLASTM by Silvaco Inc.
