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Electronic structure and defect properties of B6 O from hybrid functional and many-body perturbation theory calculations: A possible ambipolar transparent conductor

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Varley, J.B. [Lawrence Livermore National Laboratory, Livermore, USA] Lordi, V. [Lawrence Livermore National Laboratory, Livermore, USA] Miglio, Anna [UCL] Hautier, Geoffroy [UCL]

B6O is a member of icosahedral boron-rich solids known for their physical hardness and stability under irradiation bombardment, but it has also recently emerged as a promising high mobility p-type transparent conducting oxide. Using a combination of hybrid functional and many-body perturbation theory calculations, we report on the electronic structure and defect properties of this material. Our calculations identify B6O has a direct band gap in excess of 3.0 eV and possesses largely isotropic and low effective masses for both holes and electrons. Of the native defects, we identify no intrinsic origin to the reported p-type conductivity and confirm that p-type doping is not prevented by intrinsic defects such as oxygen vacancies, which we find act exclusively as neutral defects rather than hole-killing donors. We also investigate a number of common impurities and plausible dopants, finding that isolated acceptor candidates tend to yield deep states within the band gap or act instead as donors, and cannot account for p-type conductivity. Our calculations identify the only shallow acceptor candidate to be a complex consisting of interstitial H bonded to C substituting on the O site (CH)O. We therefore attribute the origins of p-type conductivity to these complexes formed during growth or more likely via isolated CO which later binds with H within the crystal. Lastly, we identify Si as a plausible n-type dopant, as it favorably acts as a shallow donor and does not suffer from self-compensation as may the C-related defects. Thus, in addition to the observed p-type conductivity, B6O exhibits promise of n-type dopability if the stoichiometry and both native and extrinsic sources of compensation can be sufficiently controlled. © 2014 American Physical Society.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2014
Language Anglais
Journal information "Physical review. B, Condensed matter and materials physics" - Vol. 90, no. 4, p. 045205 (2014)
Peer reviewed yes
issn 1098-0121
e-issn 1550-235X
Publication status Publié
Affiliation UCL - SST/IMCN/NAPS - Nanoscopic Physics
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Bibliographic reference Varley, J.B. ; Lordi, V. ; Miglio, Anna ; Hautier, Geoffroy. Electronic structure and defect properties of B6 O from hybrid functional and many-body perturbation theory calculations: A possible ambipolar transparent conductor. In: Physical review. B, Condensed matter and materials physics, Vol. 90, no. 4, p. 045205 (2014)
Permanent URL http://hdl.handle.net/2078.1/156674