Long-Range Lattice Engineering of MoTe2 by a 2D Electride

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Doping two-dimensional (2D) semiconductors beyond their degenerate levels provides the opportunity to investigate extreme carrier density-driven superconductivity and phase transition in 2D systems. Chemical functionalization and the ionic gating have achieved the high doping density, but their effective ranges have been limited to similar to 1 nm, which restricts the use of highly doped 2D semiconductors. Here, we report on electron diffusion from the 2D electride [Ca2N](+)e to MoTe2 over a distance of 100 nm from the contact interface, generating an electron doping density higher than 1.6 x 10(14) cm(2) and a lattice symmetry change of MoTe2 as a consequence of the extreme doping. The long-range lattice symmetry change, suggesting a length scale surpassing the depletion width of conventional metalsemiconductor junctions, was a consequence of the low work function (2.6 eV) with highly mobile anionic electron layers of [Ca2N](+)e . The combination of 2D electrides and layered materials yields a novel material design in terms of doping and lattice engineering.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-06
Language
English
Article Type
Article
Keywords

TRANSITION-METAL DICHALCOGENIDES; ELECTRONIC-STRUCTURE; PHASE-TRANSITION; MOS2; GRAPHENE; TRANSISTORS; MONOLAYER; FRICTION; STRAIN; LAYER

Citation

NANO LETTERS, v.17, no.6, pp.3363 - 3368

ISSN
1530-6984
DOI
10.1021/acs.nanolett.6b05199
URI
http://hdl.handle.net/10203/224867
Appears in Collection
PH-Journal Papers(저널논문)
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