Approaching the Schottky-Mott limit in van der Waals metal-semiconductor junctions

Nature
Yuan LiuXiangfeng Duan

Abstract

The junctions formed at the contact between metallic electrodes and semiconductor materials are crucial components of electronic and optoelectronic devices 1 . Metal-semiconductor junctions are characterized by an energy barrier known as the Schottky barrier, whose height can, in the ideal case, be predicted by the Schottky-Mott rule2-4 on the basis of the relative alignment of energy levels. Such ideal physics has rarely been experimentally realized, however, because of the inevitable chemical disorder and Fermi-level pinning at typical metal-semiconductor interfaces2,5-12. Here we report the creation of van der Waals metal-semiconductor junctions in which atomically flat metal thin films are laminated onto two-dimensional semiconductors without direct chemical bonding, creating an interface that is essentially free from chemical disorder and Fermi-level pinning. The Schottky barrier height, which approaches the Schottky-Mott limit, is dictated by the work function of the metal and is thus highly tunable. By transferring metal films (silver or platinum) with a work function that matches the conduction band or valence band edges of molybdenum sulfide, we achieve transistors with a two-terminal electron mobility at room temperat...Continue Reading

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Citations

Aug 7, 2018·Chemical Society Reviews·Yuan LiuXiangfeng Duan
Sep 14, 2018·Physical Chemistry Chemical Physics : PCCP·Ying GuoJing Lu
Feb 27, 2019·Nanotechnology·Gianluca MilanoCarlo Ricciardi
Apr 16, 2019·Nanoscale·Dominik AndrzejewskiGerd Bacher
Apr 24, 2019·Advanced Materials·Samuel W LaGasseJi Ung Lee
Jul 25, 2019·Nanoscale·Thayer S WalmsleyYa-Qiong Xu
Oct 1, 2019·Nanoscale·Changsik KimWon Jong Yoo
Nov 26, 2019·Nanotechnology·Xingjuan SongWing-Man Tang
Mar 5, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Wugang LiaoHan Zhang
Apr 3, 2020·Advanced Materials·Yuda ZhaoPaolo Samorì
Oct 2, 2019·Angewandte Chemie·Xun WangMuhammad Khurram
May 16, 2020·Proceedings of the National Academy of Sciences of the United States of America·Samuel PalatoPatanjali Kambhampati
Jul 3, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Xin JinShixuan Du
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Aug 15, 2020·Small·Sejeong KimIgor Aharonovich
Oct 2, 2020·Physical Chemistry Chemical Physics : PCCP·Xin-Ping ZhaiHao-Li Zhang
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Jun 12, 2019·Advanced Materials·Zheng FanXiangfeng Duan

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Methods Mentioned

BETA
electron-beam lithography
transmission electron microscopy

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