journal article·2021-09-01Open access

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

Yeonhoo Kim, Roxanne Tutchton, Ren Liu, Sergiy Krylyuk, Jian-Xin Zhu, Albert V. Davydov, Young Joon Hong, Jinkyoung Yoo

APL Materials· Volume 9· Issue 9

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.
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Research context

OpenAlex topics: Graphene research and applications · 2D Materials and Applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Integrated Nanotechnologies, Los Alamos National Laboratory 1 , Los Alamos, New Mexico 87545, USA

T-4, Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545, USA

Department of Electrical and Computer Engineering, University of California San Diego 3 , La Jolla, California 92093, USA

Materials Science and Engineering Division, National Institute of Standards and Technology 4 , Gaithersburg, Maryland 20899, USA

Department of Nanotechnology and Advanced Materials Engineering, Sejong University 5 , Seoul 05006, Republic of Korea

GRI-TPC International Research Center, Sejong University 6 , Seoul 05006, Republic of Korea

Funding

U.S. Department of Energy · Office of the President, University of California · National Institute of Standards and Technology

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