Performance and low power consumption of two-dimensional SiC field effect transistors regulated and optimized with asymmetric electrodes

CHEN Jianju; PENG Shuping; DENG Shuling; ZHOU Wen; FAN Zhiqiang; ZHANG Xiaojiao

doi:10.7498/aps.74.20250849

Abstract

By using the first-principles method based on density functional theory and non-equilibrium Green’s function, the transport properties of 5-nm two-dimensional SiC field-effect transistors with asymmetric metal phase 1T-MoS₂ sources and Pd drain electrodes are investigated. The influence mechanism of increasing the electrode layers of 1T-MoS₂ and reducing the working electrical compression on the device performance is systematically analyzed. The Schottky barriers extracted from the zero bias and zero gate voltage transport spectra show that the valence band maximum of SiC in the channel regions of MFET, BFET and TFET are closer to the Fermi level after the source drain electrode has been balanced. Therefore, these three devices belong to P-type contact, and the height of the hole Schottky barrier increases with the increase of the number of 1T-MoS₂ layers in the source electrode, which are 0.6, 0.76, and 0.88 eV, respectively. In addition, the increase of 1T-MoS₂ layers will also lead to the increase of the density of states in the source electrode, thereby improving the transport coefficient at the band edge. The effects of the two on the transport capacity of the device are opposite, and there is a competitive relationship. The transfer characteristics of devices show that the wide band gap of SiC can significantly suppress the short channel effect, so that all devices can meet the requirements of Off-state. More importantly, the subthreshold swings of all devices at an operating voltage of 0.64 V are all close to the physical limit of 60 mV/dec. The ON-state currents of MFET, BFET and TFET can reach 1553, 1601 and 1702 μA/μm under the more stringent IRDS HP standard, and the three performance parameters, i.e. intrinsic gate capacitance, power-delay product and delay time, can greatly exceed the standards in the international road map of equipment and systems (IRDS) for high-performance devices. In addition, the working voltage of MFET can be reduced to 0.52 V, and the corresponding power-delay product and delay time are as low as 0.086 fJ/μm and 0.038 ps, which are only 14% and 4% of the IRDS standard. The asymmetric source drain electrode design strategy proposed in this work not only solves the problems about low On-state current and short channel effect restricting Off-state current of existing two-dimensional material field-effect transistors, but also provides an important solution for developing ultra-low power nano electronic devices in the post Moore era.

Keywords:

Authors and contacts

1.
School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China
2.
School of Microelectronics and Physics, Hunan University of Technology and Business, Changsha 410205, China

Corresponding author: FAN Zhiqiang, zqfan@csust.edu.cn ; ZHANG Xiaojiao, xjzhang@hutb.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12074046).

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References

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Cited By

图 1 金属相1T-MoS₂和Pd金属为非对称源漏电极的5 nm二维SiC场效应晶体管的结构图

Figure 1. Detailed structure of 5 nm FET based on two-dimensional SiC with metal 1T-MoS₂ contact (source) and palladium contact (drain).

DownLoad: Full-Size Img PowerPoint

图 2 (a) MFET, (b) BFET和(c) TFET在零偏压和零栅极电压下的输运谱和投影局域态密度. 费米能级在能量标度中设置为零

Figure 2. Transmission spectra and the projected local density of states (LDOS) of (a) MFET, (b) BFET, and (c) TFET under zero-bias voltage and zero-gate voltage. The Fermi level is set to zero in the energy scale.

DownLoad: Full-Size Img PowerPoint

图 3 MFET, BFET和TFET的转移特性(a), 开态电流(b)和亚阈值摆幅(c)

Figure 3. Transfer characteristic (a), ON-current (b), and subthreshold swing (c) of MFET, BFET and TFET, respectively.

DownLoad: Full-Size Img PowerPoint

图 4 (a) MFET在0. 6 V, 0. 56 V, 0. 52 V, 0. 48 V和0. 44 V 工作电压V_DD下的(a)转移特性, (b)开态电流和(c)亚阈值摆幅

Figure 4. (a) Transfer characteristic, (b) ON-current, and (c) subthreshold swing of MFET under V_DD of 0.6 V, 0.56 V, 0.52 V, 0.48 V, and 0.44 V, respectively.

DownLoad: Full-Size Img PowerPoint

表 1 MFET, BFET和TFET的性能与IRDS高性能设备要求的对比

Table 1. Performances of the MFET, BFET和TFET against the HP devices requirements of the IRDS.

	C_g/ (fF·μm^–1)	PDP/ (fJ·μm^–1)	τ/ps
IRDS标准	0.39	0.49	0.96
MFET (V_DD = 0.64 V)	0.150	0.061	0.064
BFET (V_DD = 0.64 V)	0.155	0.063	0.064
TFET (V_DD = 0.64 V)	0.134	0.055	0.051
MFET (V_DD = 0.60 V)	0.146	0.071	0.056
MFET (V_DD = 0.56 V)	0.138	0.078	0.043
MFET (V_DD = 0.52 V)	0.142	0.086	0.038

DownLoad: CSV

[1]	Wang Q H, Kalantar-Zadeh K, Kis A, Coleman J N, Strano M S 2012 Nat. Nanotech. 7 699 Google Scholar
[2]	赵俊, 姚璨, 曾晖 2024 物理学报 73 126802 Google Scholar Zhao J, Yao C, Zeng H 2024 Acta Phys. Sin. 73 126802 Google Scholar
[3]	Cui Y, Li B, Li J B, Wei Z M 2018 Sci. China-Phys. Mech. Astron. 61 016801 Google Scholar
[4]	Wu D, Cao X H, Jia P J, et al. 2020 Sci. China-Phys. Mech. Astron. 63 276811 Google Scholar
[5]	Liu Q, Huang X D, Chen J J, Wu D, Deng X Q, Fan Z Q, Xie H Q, Chen K Q 2025 Appl. Phys. Lett. 126 253502 Google Scholar
[6]	Radisavljevic B, Radenovic A, Brivio J, Giacometti V, Kis A 2011 Nat. Nanotech. 6 147 Google Scholar
[7]	Cui Y, Zhou Z Q, Li T, Wang K Y, Li J B, Wei Z M 2019 Adv. Funct. Mater. 29 1900040 Google Scholar
[8]	Ren Y, Zhou X Y, Zhou G H 2021 Phys. Rev. B 103 045405 Google Scholar
[9]	Liu Q, Li J J, Wu D, Deng X Q, Zhang Z H, Fan Z Q, Chen K Q 2021 Phys. Rev. B 104 045412 Google Scholar
[10]	Zhou W X, Cheng Y, Chen K Q, Xie G F, Wang T, Zhang G 2020 Adv. Funct. Mater. 30 1903829 Google Scholar
[11]	Quhe R G, Wang Y Y, Lu J 2015 Chin. Phys. B 24 088105 Google Scholar
[12]	Huang X D, Liu Q, Xie H Q, Deng X Q, Fan Z Q, Wu D, Chen K Q 2023 IEEE Trans. Electron. Dev. 70 5462 Google Scholar
[13]	郭颖, 潘峰, 姚彬彬, 孟豪, 吕劲 2024 物理学报 73 207304 Google Scholar Guo Y, Pan F, Yao B B, Meng H, Lü J 2024 Acta Phys. Sin. 73 207304 Google Scholar
[14]	Qu H Z, Zhang S L, Cao J, et al. 2024 Sci. Bull. 69 1427 Google Scholar
[15]	Ma L K, Tao Q Y, Chen Y, Lu Z Y, Liu L T, Li Z W, Lu D L, Wang Y L, Liao L, Liu Y 2023 Nano Lett. 23 8303 Google Scholar
[16]	Chabi S, Guler Z, Brearley A J, Benavidez A D, Luk T S 2021 Nanomaterials 11 1799 Google Scholar
[17]	Zhou B H, Zhou B L, Liu G, et al. 2016 Physica B 500 106 Google Scholar
[18]	Farokhnezhad M, Esmaeilzadeh M, Ahmadi S, Pournaghavi N 2015 J. Appl. Phys. 117 173913 Google Scholar
[19]	Cui X Q, Liu Q, Fan Z Q, Zhang Z H 2020 Org. Electron. 84 105808 Google Scholar
[20]	邓旭良, 冀先飞, 王德君, 黄玲琴 2022 物理学报 71 058102 Google Scholar Deng X L, Ji X F, Wang D J, Huang L Q 2022 Acta Phys. Sin. 71 058102 Google Scholar
[21]	Xie H Q, Li J Y, Liu G, Cai X Y, Fan Z Q 2019 IEEE Trans. Electron Devices 66 5111 Google Scholar
[22]	Xie H Q, Wu D, Deng X Q, Fan Z Q, Zhou W X, Xiang C Q, Liu Y Y 2021 Chin. Phys. B 30 117102 Google Scholar
[23]	International roadmap for devices and systems (IRDS)(2023 Edition) https://irds.ieee.org
[24]	Okyay A K, Chui C O, Saraswat K C 2006 Appl. Phys. Lett. 88 063506 Google Scholar
[25]	Li D W, Zhao M, Liang K, et al. 2020 Nanoscal 12 21610 Google Scholar
[26]	Wu J Y, Chun Y T, Li S P, Zhang T, Chu D P 2018 ACS Appl. Mater. Interfaces 10 24613 Google Scholar
[27]	Liu Z, Cao G, Guan Z Z, Tian Y, Liu J D, Chen J, Deng S Z, Liu F 2024 J. Mater. Chem. C 12 17395 Google Scholar
[28]	Smidstrup S, Markussen T, Vancraeyveld P, et al. 2020 J. Phys. Condens. Matter 32 015901 Google Scholar
[29]	Büttiker M, Imry Y, Landauer R, Pinhas S 1985 Phys. Rev. B 31 6207 Google Scholar
[30]	Liu H, Neal A T, Ye P D 2012 ACS Nano 6 8563 Google Scholar
[31]	Xie H Q, Li J Y, Liu G, Cai X Y, Fan Z Q 2020 IEEE Trans. Electron Devices 67 4130 Google Scholar
[32]	Zhao P, Chauhan J, Guo J 2009 Nano Lett. 9 684 Google Scholar
[33]	Fan Z Q, Zhang Z H, Yang S Y 2020 Nanoscale 12 21750 Google Scholar

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