Boron and nitrogen impurities in SiC nanoribbons: an ab initio investigation

Details Boron and nitrogen impurities in SiC nanoribbons: an ab initio investigation Boron and nitrogen impurities in SiC nanoribbons: an ab initio investigation

2011-01-27

arxiv.org/abs/1101.5197v3

J. Phys.: Condens. Matter 23, 205504 (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1088/0953-8984/23/20/205504

Using ab initio calculations based on density-functional theory we have performed a theoretical investigation of substitutional boron and nitrogen impurities in silicon carbide (SiC) nanoribbons. We have considered hydrogen terminated SiC ribbons with zigzag and armchair edges. In both systems we verify that the boron and nitrogen atoms energetically prefer to be localized at the edges of the nanoribbons. However, while boron preferentially substitutes a silicon atom, nitrogen prefers to occupy a carbon site. In addition, our electronic-structure calculations indicate that (i) substitutional boron and nitrogen impurities do not affect the semiconducting character of the armchair SiC nanoribbons, and (ii) the half-metallic behavior of the zigzag nanoribbons is maintained in the presence of substitutional boron impurities. In contrast, nitrogen atoms occupying edge carbon sites transform half-metallic zigzag nanoribbons into metallic systems.

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