Layer dependent direct tunneling behaviors through two dimensional titania nanosheets

Pu, Yayun1,3,4; Xie, Xiong1,2; Wang, Liang2; Shen, Jun1

2020

10.1016/j.commatsci.2019.109398

COMPUTATIONAL MATERIALS SCIENCE   影响因子和分区

0927-0256

1879-0801

Two dimensional titania nanosheets are drawing increasing attention in academic and industrial community because of their versatile properties. The elucidation of the electron tunneling effect through their intrinsic metal-oxide-metal (MOM) atomic structures is imperative to further advance their applications as atomic dielectrics and memristors. The direct tunneling behaviors through Ti1-δO2^4δ- nanosheets sandwiched by two metal electrodes are studied by a modified WKB approximation and conformed by ab-initio calculation. Our results show that the tunneling current density depends exponentially on the stack number of dielectric Ti1-δO2^4δ- layers, decreases by 3–4 orders of magnitude for each layer addition, varying from 10⁶ to 10⁻⁸ A/cm² in one- to five-layer MOM structures. Also, it is highlighted that the localized intercalation charges naturally embedded in chemically-derived Ti1-δO2^4δ- nanosheets could reduce tunneling current by 3 orders of magnitude and that a thickness threshold of three layers (∼2 nm) exists as to the titania nanosheets not to exceed a gate current density of 1 A/cm² at 1 V. The present method could be extended to better clarify the electron tunneling behaviors in other two-dimensional gate dielectrics.
© 2019

Two dimensional oxides Titania nanosheet Electron tunneling WKB approximation

SCI ; EI

英语

其他

Fundamental Research Funds for the Central Universities[2018CDGFCL0003] ; National Natural Science Foundation of China[21875245]

Materials Science

Materials Science, Multidisciplinary

WOS:000506172700033

Elsevier B.V.

20194807748918

Approximation theory ; Calculations ; Dielectric materials ; Gate dielectrics ; Metals ; Nanosheets ; Titanium dioxide

Dielectric Materials:708.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Mathematics:921 ; Numerical Methods:921.6 ; Solid State Physics:933

MATERIALS SCIENCE

Web of Science

1.State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing; 400044, China
2.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing; 400714, China
3.School of Chemistry, University of Birmingham, Edgbaston, Birmingham; B15 2TT, United Kingdom
4.Department of Chemistry, Southern University of Science and Technology, No. 1088 Xueyuan Blvd, Shenzhen; Guangdong; 518055, China

Pu, Yayun,Xie, Xiong,Wang, Liang,et al. Layer dependent direct tunneling behaviors through two dimensional titania nanosheets[J]. COMPUTATIONAL MATERIALS SCIENCE,2020,173.

Pu, Yayun,Xie, Xiong,Wang, Liang,&Shen, Jun.(2020).Layer dependent direct tunneling behaviors through two dimensional titania nanosheets.COMPUTATIONAL MATERIALS SCIENCE,173.

Pu, Yayun,et al."Layer dependent direct tunneling behaviors through two dimensional titania nanosheets".COMPUTATIONAL MATERIALS SCIENCE 173(2020).