期刊
NANO LETTERS
卷 21, 期 1, 页码 136-143出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03386
关键词
tunable superconductivity; NbSe2; transition metal dichalcogenide; large-area functionalization; self-assembly; monolayer TMD
类别
资金
- European Union H2020 under the Marie Sklodowska-Curie Actions [766025-QuES-Tech, 748971-SUPER2D]
- ERC Starting Grant LINKSPM [758558]
- la Caixa Foundation [100010434, LCF/BQ/PI19/11690017]
- Spanish MICINN under the Maria de Maeztu Units of Excellence Programme [MDM-2016-0618, MAT2015-65159-R, MAT2017-88377-C2-1-R, RTI2018-094861-B-100, PID2019-108153GA-I00]
- European Research Council (ERC) [758558] Funding Source: European Research Council (ERC)
In this study, the critical temperature of large-area NbSe2 monolayers was manipulated using ultrathin molecular adlayers. The aligned molecular dipoles within the self-assembled layers acted as a fixed gate terminal, generating a macroscopic electrostatic field on NbSe2. This manipulation resulted in significant changes in T-C, with the potential to improve air stability of NbSe2.
Two-dimensional transition metal dichalcogenides (TMDs) represent an ideal testbench for the search of materials by design, because their optoelectronic properties can be manipulated through surface engineering and molecular functionalization. However, the impact of molecules on intrinsic physical properties of TMDs, such as superconductivity, remains largely unexplored. In this work, the critical temperature (T-C) of large-area NbSe2 monolayers is manipulated, employing ultrathin molecular adlayers. Spectroscopic evidence indicates that aligned molecular dipoles within the self-assembled layers act as a fixed gate terminal, collectively generating a macroscopic electrostatic field on NbSe2. This results in an similar to 55% increase and a 70% decrease in T-C depending on the electric field polarity, which is controlled via molecular selection. The reported functionalization, which improves the air stability of NbSe2, is efficient, practical, up-scalable, and suited to functionalize large-area TMDs. Our results indicate the potential of hybrid 2D materials as a novel platform for tunable superconductivity.
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