Direct band gap carbon superlattices with efficient optical transition

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We report pure carbon-based superlattices that exhibit direct band gaps and excellent optical absorption and emission properties at the threshold energy. The structures are nearly identical to that of cubic diamond except that defective layers characterized by five- and seven-membered rings are intercalated in the diamond lattice. The direct band gaps lie in the range of 5.6-5.9 eV, corresponding to wavelengths of 210-221 nm. The dipole matrix elements of direct optical transition are comparable to that of GaN, suggesting that the superlattices are promising materials as an efficient deep ultraviolet light emitter. Molecular dynamics simulations show that the superlattices are thermally stable even at a high temperature of 2000 K. We provide a possible route to the synthesis of superlattices through wafer bonding of diamond (100) surfaces.
Publisher
American Physical Society
Issue Date
2016-02
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B , v.93, no.8, pp.085201 - 085201

ISSN
2469-9950
DOI
10.1103/PhysRevB.93.085201
URI
http://hdl.handle.net/10203/209116
Appears in Collection
PH-Journal Papers(저널논문)
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