Journal
NANOTECHNOLOGY
Volume 26, Issue 13, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0957-4484/26/13/135703
Keywords
MXene monolayer; transition metal disulfide monolayer; density functional theory; two dimensional heterostructure
Funding
- National Basic Research Program of China (973 program) [2013CB632401]
- National Natural Science foundation of China [21333006, 11174180]
- Fund for Doctoral Program of National Education [20120131110066]
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Two-dimensional (2D) transition metal compound (TMC) monolayers, as well as their van der Waals heterostructures with unique properties, are fundamentally and technologically intriguing. Here, heterostructures consisting of a MoS2 monolayer and TM2CO2 (TM = Ti, Zr or Hf) monolayers are systematically researched by means of the density functional theory (DFT). Different from semiconductor/metal contacts, MoS2 and TM2CO2 monolayers are all semiconductors with band gaps ranging from 0.25-1.67 eV. According to rigorous screening of stacking patterns, MoS2/Zr2CO2 is shown to be an indirect type-II semiconductor with the maximum valence and minimum conduction bands spatially separated on opposite monolayers. Simultaneously, the interface charges transfer from Zr2CO2 to MoS2 results in a built-in field that separates the electrons and holes efficiently. Also, the smaller effective masses of electrons and the holes of band edges indicate the higher carrier mobility. Moreover, strain regulation can make the hetero-bilayer's character a semiconductor-semimetal-metal transition. The physical insights pave the way for the good performance of MoS2/TM2CO2 in next-generation electronic devices and photocatalysts.
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