(4,4)碳纳米管/碳化硅纳米管异质结的输运特性

doi:10.3969/j.issn.1001-2400.2010.03.024

J4 ›› 2010, Vol. 37 ›› Issue (3): 520-523.doi: 10.3969/j.issn.1001-2400.2010.03.024

(4,4)碳纳米管/碳化硅纳米管异质结的输运特性

刘红霞¹;宋久旭^1,2;张鹤鸣¹

(1. 西安电子科技大学宽禁带半导体材料与器件教育部重点实验室，陕西西安 710071;
2. 西安石油大学电子工程学院，陕西西安 710065)

收稿日期:2009-02-11 出版日期:2010-06-20 发布日期:2010-07-23
作者简介:刘红霞(1979-)，女，西安电子科技大学博士研究生，E-mail: liuhx@mail.xidian.edu.cn．
基金资助:
国家部委预研基金资助项目(51308040203)

Electronic transport properties of a (4， 4) carbon nanotube/silicon carbide nanotube heterojunction

LIU Hong-xia¹;SONG Jiu-xu^1,2;ZHANG He-ming¹

(1. Ministry of Education Key Lab. of Wide Band-Gap Semiconductor Materials and Devices, Xidian Univ., Xi'an 710071， China;
2. School of Electronic Eng., Xi'an Shiyou Univ., Xi'an 710065， China)

Received:2009-02-11 Online:2010-06-20 Published:2010-07-23

摘要/Abstract

摘要：

建立了(4，4)碳纳米管/碳化硅纳米管异质结的模型，采用非平衡格林函数法计算了该异质结的输运特性．从异质结的分子投影自洽哈密顿量的本征轨道，可以看出最高占据分子轨道和最低空轨道均位于碳纳米管侧，其能带间隙约为0.48eV; 从其伏安特性可以看出，在正负偏压下开启电压为+2.0V和-1.6V．

关键词: 碳纳米管, 碳化硅纳米管, 异质结, 输运特性, 非平衡格林函数

Abstract:

The transport properties of the nanotube heterojunctions are the basis for the studies of their working mechanism, which is important for the theoretical study and the practical application. First, a two-probe model for a (4, 4) carbon nanotube (CNT)/silicon carbide nanotube (SiCNT) heterojunction is established. The transport properties of the heterojunction is realized with the nonequilibrium Green's function (NEGF). From the orbitals of the molecule projected self-consistent Hamiltonian, we can see that the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) concentrate mainly on the CNT section and that the band gap of the heterojunction is about 0.48 eV. The turn-on voltages of the heterojunction under the positive and negative voltage are +2.0V and -1.6V, which can be achieved from its voltage-current characteristic.

Key words: carbon nanotube, silicon carbide nanotube, heterojunction, transport properties, nonequilibrium Green's function

刘红霞;宋久旭;张鹤鸣. (4,4)碳纳米管/碳化硅纳米管异质结的输运特性[J]. J4, 2010, 37(3): 520-523.

LIU Hong-xia;SONG Jiu-xu;ZHANG He-ming. Electronic transport properties of a (4， 4) carbon nanotube/silicon carbide nanotube heterojunction[J]. J4, 2010, 37(3): 520-523.

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(4,4)碳纳米管/碳化硅纳米管异质结的输运特性

Electronic transport properties of a (4， 4) carbon nanotube/silicon carbide nanotube heterojunction

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