期刊
ACS NANO
卷 10, 期 2, 页码 1738-1743出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05927
关键词
metal phosphorus trichalcogenides; two-dimensional semiconductors; cleavage energy; band gap; Raman spectroscopy
类别
资金
- National Research Foundation, Prime Minister's Office, Singapore
- Singapore Ministry of Education [MOE2013-T2-1-049, 2013-T1-002-232, MoE AcRT RG125/14]
- AFOSR via its Asian Office of Aerospace Research Development [FA2368-13-1-4112]
2D semiconducting metal phosphorus trichalcogenides, particularly the bulk crystals of MPS3 (M = Fe, Mn, Ni, Cd and Zn) sulfides and MPSe3 (M = Fe and Mn) selenides, have been synthesized, crystallized and exfoliated into monolayers. The Raman spectra of monolayer FePS3 and 3-layer FePSe3 show the strong intralayer vibrations and structural stability of the atomically thin layers under ambient condition. The band gaps can be adjusted by element choices in the range of 1.3-3.5 eV. The wide-range band gaps suggest their optoelectronic applications in a broad wavelength range. The calculated cleavage energies of MPS3 are smaller than that of graphite. Therefore, the monolayers used for building of heterostructures by van der Waals stacking could be considered as the candidates for artificial 2D materials with unusual ferroelectric and magnetic properties.
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