2016/01/04 by Young Jun Oh, Sunghyun Kim, In-Ho Lee +3 · 1 citation
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Band gap #Chemistry #Condensed matter physics #Diamond #Diamond and Carbon-based Materials Research #Diamond cubic #Dipole #Direct and indirect band gaps #Electronic band structure #Graphene research and applications #Materials science #Optoelectronics #Physics #Semiconductor materials and devices #Superlattice #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.93.085201
9 pages, 11 figures
arxiv created 2016/01/04 · openalex publication_date 2016/02/04 · arxiv updated 2016/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.