Visualizing band offsets and edge states in bilayer-monolayer transition metal dichalcogenides lateral heterojunction

Nature Communications
Chendong ZhangChih-Kang Shih

Abstract

Semiconductor heterostructures are fundamental building blocks for many important device applications. The emergence of two-dimensional semiconductors opens up a new realm for creating heterostructures. As the bandgaps of transition metal dichalcogenides thin films have sensitive layer dependence, it is natural to create lateral heterojunctions (HJs) using the same materials with different thicknesses. Here we show the real space image of electronic structures across the bilayer-monolayer interface in MoSe2 and WSe2, using scanning tunnelling microscopy and spectroscopy. Most bilayer-monolayer HJs are found to have a zig-zag-orientated interface, and the band alignment of such atomically sharp HJs is of type-I with a well-defined interface mode that acts as a narrower-gap quantum wire. The ability to utilize such commonly existing thickness terraces as lateral HJs is a crucial addition to the tool set for device applications based on atomically thin transition metal dichalcogenides, with the advantage of easy and flexible implementation.

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Citations

May 5, 2017·Nature Communications·Yuxuan ChenChih-Kang Shih
Dec 15, 2016·Nature Communications·Qiang ZhangChih-Kang Shih
Apr 19, 2018·Nanoscale·Junfeng ZhangShengbai Zhang
Sep 25, 2018·Physical Chemistry Chemical Physics : PCCP·Hao WangYing Dai
Feb 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·O Ávalos-OvandoS E Ulloa
Aug 15, 2019·Chemical Society Reviews·Jizhou JiangAndrew T S Wee
Dec 6, 2019·Nature Communications·Teng-Xiang HuangBin Ren
Jul 9, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R SaitoM S Dresselhaus
Dec 17, 2016·Advanced Science·Xing ZhouTianyou Zhai
Dec 18, 2018·Science Advances·Yao GuoYang Chai
Aug 4, 2020·Physical Review Letters·Pierre MalletJean-Yves Veuillen
Mar 29, 2019·Nanotechnology·Jonathan LudwigKristof Paredis
Mar 2, 2021·Advanced Materials·Fakun WangTianyou Zhai
Jun 5, 2019·Nano-micro Letters·Jianwei WangXiaobin Niu
Jul 4, 2021·Advanced Materials·Kai ChangStuart S P Parkin
Jul 13, 2018·Nano Letters·Evgeniy PonomarevAlberto F Morpurgo
Sep 11, 2020·ACS Applied Materials & Interfaces·Chaoyang TanTianyou Zhai
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Sep 12, 2020·ACS Applied Materials & Interfaces·Ghazanfar NazirSoo-Jin Park
Jul 1, 2020·ACS Nano·Clifford MurrayThomas Michely
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Dec 4, 2019·The Journal of Physical Chemistry Letters·Jeffrey L BlackburnObadiah George Reid
Aug 17, 2018··T. PolakovićD. J. Trainer

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