Van der Waals metal-semiconductor junction: Weak Fermi level pinning enables effective tuning of Schottky barrier

Liu, Yuanyue; Stradins, Paul; Wei, Su -Huai

doi:10.1126/sciadv.1600069

Title: Van der Waals metal-semiconductor junction: Weak Fermi level pinning enables effective tuning of Schottky barrier

Journal Article · Fri Apr 22 00:00:00 EDT 2016 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1600069· OSTI ID:1249399

Liu, Yuanyue ^[1]; Stradins, Paul ^[1]; Wei, Su -Huai ^[2]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Beijing Computational Science Research Center (China)

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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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE SunShot Foundational Program to Advance Cell Efficiency (F-PACE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1249399

Report Number(s):: NREL/JA-5J00-66053

Journal Information:: Science Advances, Vol. 2, Issue 4; Related Information: Science Advances; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 280 works

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