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Low barrier height in a ZnO nanorods/NbSe2 heterostructure prepared by van der Waals epitaxy

Authors :
Roxanne Tutchton
Ren Liu
Albert V. Davydov
Yeon Hoo Kim
Young Joon Hong
Sergiy Krylyuk
Jian-Xin Zhu
Jinkyoung Yoo
Source :
APL Materials, Vol 9, Iss 9, Pp 091107-091107-7 (2021)
Publication Year :
2021
Publisher :
AIP Publishing LLC, 2021.

Abstract

Two-dimensional (2D) materials as contacts for semiconductor devices have attracted much attention due to minimizing Fermi level pinning. Schottky–Mott physics has been widely employed to design 2D material-based electrodes and to elucidate their contact behavior. In this study, we revealed that charge transfer across a 2D/semiconductor heterointerface and materials characteristics besides work function should be accounted for in fabrication of electrodes based on 2D materials. Our density functional theory (DFT) calculations predicted that charge transfer between ZnO and NbSe2 lowers the barrier height at the heterojunction and that conductive surface states of ZnO provide an additional conduction channel in the ZnO/NbSe2 heterostructures. Crystalline ZnO/NbSe2 heterostructures were prepared by the hydrothermal method. Electrical characterizations of the ZnO/NbSe2 heterostructures showed Ohmic-like behavior as predicted by the DFT calculations, opposed to the prediction based on the Schottky–Mott model.

Details

Language :
English
Volume :
9
Issue :
9
Database :
OpenAIRE
Journal :
APL Materials
Accession number :
edsair.doi.dedup.....769490d6955308a5a3fce0210c85ba28