Long-Range Lattice Engineering of MoTe2 by a 2D Electride
| Autor: | Jaeyoon Baik, Kee-Joo Chang, Jongho Park, Heejun Yang, Duk-Hyun Choe, Young Hee Lee, Dohyun Kim, Suyeon Cho, Seung Hyun Song, Ho Sung Yu, Sung Wng Kim, Sera Kim |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Phase transition Materials science Condensed matter physics business.industry Mechanical Engineering Doping Ionic bonding Bioengineering 02 engineering and technology General Chemistry Electron 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Semiconductor chemistry Electride General Materials Science Work function 0210 nano-technology business |
| Zdroj: | Nano Letters. 17:3363-3368 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | 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 ∼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 × 1014 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 metal–semiconductor 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 i... |
| Databáze: | OpenAIRE |
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