A 2-D semi-analytical model of double-gate tunnel field-effect transistor

A 2-D semi-analytical model of double gate （DG） tunneling field-effect transistor （TFET） is proposed. By aid of introducing two rectangular sources located in the gate dielectric layer and the channel, the 2-D Poisson equation is solved by using a semi-analytical method combined with an eigenfunctio...

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Bibliographic Details
Published inJournal of semiconductors Vol. 36; no. 5; pp. 24 - 30
Main Author 许会芳 代月花 李宁 徐建斌
Format Journal Article
LanguageEnglish
Published 01.05.2015
Subjects
Electric potential
Field effect transistors
Gates (circuits)
Mathematical models
Semiconductors
Thickness
Tunneling
Voltage
二维泊松方程
半解析方法
半解析模型
场效应晶体管
栅极
电势分布
级数表达式
隧道长度
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Summary:A 2-D semi-analytical model of double gate （DG） tunneling field-effect transistor （TFET） is proposed. By aid of introducing two rectangular sources located in the gate dielectric layer and the channel, the 2-D Poisson equation is solved by using a semi-analytical method combined with an eigenfunction expansion method. The expression of the surface potential is obtained, which is a special function for the infinite series expressions. The influence of the mobile charges on the potential profile is taken into account in the proposed model. On the basis of the potential profile, the shortest tunneling length and the average electrical field can be derived, and the drain current is then constructed by using Kane＇s model. In particular, the changes of the tunneling parameters Ak and Bk influenced by the drain-source voltage are also incorporated in the predicted model. The proposed model shows a good agreement with TCAD simulation results under different drain-source voltages, silicon film thicknesses, gate dielectric layer thicknesses, and gate dielectric layer constants. Therefore, it is useful to optimize the DG TFET and this provides a physical insight for circuit level design.
Bibliography:A 2-D semi-analytical model of double gate （DG） tunneling field-effect transistor （TFET） is proposed. By aid of introducing two rectangular sources located in the gate dielectric layer and the channel, the 2-D Poisson equation is solved by using a semi-analytical method combined with an eigenfunction expansion method. The expression of the surface potential is obtained, which is a special function for the infinite series expressions. The influence of the mobile charges on the potential profile is taken into account in the proposed model. On the basis of the potential profile, the shortest tunneling length and the average electrical field can be derived, and the drain current is then constructed by using Kane＇s model. In particular, the changes of the tunneling parameters Ak and Bk influenced by the drain-source voltage are also incorporated in the predicted model. The proposed model shows a good agreement with TCAD simulation results under different drain-source voltages, silicon film thicknesses, gate dielectric layer thicknesses, and gate dielectric layer constants. Therefore, it is useful to optimize the DG TFET and this provides a physical insight for circuit level design.
Xu Huifang, Dai Yuehua, Li Ning, and Xu Jianbin Institute of Electronic and Information Engineering, Anhui University, Hefei 230601, China
11-5781/TN
semi-analytical method; eigenfunction expansion method; double-gate tunnel field effect transistor （TFET）; surface potential; drain current
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-4926
DOI:10.1088/1674-4926/36/5/054002