Transport properties of nanowires with alternating organosilanylene and oligoethenylene units
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Abstract
Transport properties of a series of σ–π-conjugated nanowires n Si x (C=C) y (x = 2–4, y = 1–4, and n = 2–4) were studied by using non-equilibrium Green’s function formalism with density functional theory. It is found that the silanylene moiety length, the ethenylene moiety length, and the whole molecular length play important roles in governing the transport properties of the nanowires: (1) the conductivity tends to be decreased with increasing the silanylene moiety length x; (2) lengthening the ethenylene moiety y is not always favorable to enhancing the conductivity; (3) the zero-bias conductance is decayed exponentially with the whole molecular length n. Further analysis indicates that the conductivities correlate well with the transmission spectra and the topology of the HOMO and LUMO states.
Keywords
Theoretical study Transport property Silanylene EthenyleneNotes
Acknowledgments
The authors thank the NSF of China (51073048), the NSF of Hei Long Jiang Province of China (B201102), the SF for leaders in academe of Harbin City of China (2013RFXXJ024), and the SF for elitists of Harbin University of Science and Technology, for the financial supports.
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