期刊
SCIENCE ADVANCES
卷 2, 期 4, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1600069
关键词
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资金
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- National Renewable Energy Laboratory (NREL)
- DOE Energy Efficiency and Renewable Energy (EERE) [DE-261 EE0006336]
- DOE EERE
- DOE Office of Science [DE-AC02-05CH11231]
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.
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