A two-dimensional van der Waals CdS/germanene heterojunction with promising electronic and optoelectronic properties: DFT + NEGF investigations.
Phys Chem Chem Phys
; 19(28): 18330-18337, 2017 Jul 19.
Article
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| ID: mdl-28678280
ABSTRACT
Two new 2D materials, germanene and monolayer cadmium sulfide (CdS), have been theoretically predicted and experimentally fabricated recently. In this work, we conduct a systematic investigation of the geometry structure, electronic, optical, and transport properties of a CdS/germanene heterojunction by using density functional theory (DFT) combined with the nonequilibrium Green's function (NEGF) formalism. Despite the gapless nature of germanene, the CdS/germanene heterojunction is found to be a direct band gap semiconductor, with a band gap of 0.644 eV. In particular, applying external strain can effectively tune the electronic band structure and optical properties of the CdS/germanene bilayer in a wide range, and a semiconductor-metal transition can even be achieved. In addition, the transport property calculations show that the current-voltage (I-V) relation of the CdS/germanene bilayer exhibits sensitive responses to the applied strain with a marked change in the I-V relation. Such superior electronic, optical, and transport properties make the CdS/germanene heterobilayer a promising candidate for electronic and optical device applications.
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MEDLINE
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Phys Chem Chem Phys
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BIOFISICA
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QUIMICA
Año:
2017
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Article