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Microscopic basis for the band engineering of Mo1−xWxS2-based heterojunction
Transition-metal dichalcogenide layered materials, consisting of a transition-metal atomic layer sandwiched by two chalcogen atomic layers, have been attracting considerable attention because of their desirable physical properties for semiconductor devices and a wide variety of pn junctions, which a...
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Published in: | Scientific reports 2015-10, Vol.5 (1), p.14808-14808, Article 14808 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Transition-metal dichalcogenide layered materials, consisting of a transition-metal atomic layer sandwiched by two chalcogen atomic layers, have been attracting considerable attention because of their desirable physical properties for semiconductor devices and a wide variety of pn junctions, which are essential building blocks for electronic and optoelectronic devices, have been realized using these atomically thin structures. Engineering the electronic/optical properties of semiconductors by using such heterojunctions has been a central concept in semiconductor science and technology. Here, we report the first scanning tunneling microscopy/spectroscopy (STM/STS) study on the electronic structures of a monolayer WS
2
/Mo
1−x
W
x
S
2
heterojunction that provides a tunable band alignment. The atomically modulated spatial variation in such electronic structures, i.e., a microscopic basis for the band structure of a WS
2
/Mo
1−x
W
x
S
2
heterojunction, was directly observed. The macroscopic band structure of Mo
1−x
W
x
S
2
alloy was well reproduced by the STS spectra averaged over the surface. An electric field of as high as 80 × 10
6
Vm
−1
was observed at the interface for the alloy with x = 0.3, verifying the efficient separation of photoexcited carriers at the interface. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/srep14808 |