Abstract:
:Two-dimensional (2D) semiconductors have shown great potential for electronic and optoelectronic applications. However, their development is limited by a large Schottky barrier (SB) at the metal-semiconductor junction (MSJ), which is difficult to tune by using conventional metals because of the effect of strong Fermi level pinning (FLP). We show that this problem can be overcome by using 2D metals, which are bounded with 2D semiconductors through van der Waals (vdW) interactions. This success relies on a weak FLP at the vdW MSJ, which is attributed to the suppression of metal-induced gap states. Consequently, the SB becomes tunable and can vanish with proper 2D metals (for example, H-NbS2). This work not only offers new insights into the fundamental properties of heterojunctions but also uncovers the great potential of 2D metals for device applications.
journal_name
Sci Advjournal_title
Science advancesauthors
Liu Y,Stradins P,Wei SHdoi
10.1126/sciadv.1600069subject
Has Abstractpub_date
2016-04-22 00:00:00pages
e1600069issue
4issn
2375-2548pii
1600069journal_volume
2pub_type
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