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Title: Atomically thin layers of B�N�C�O with tunable composition
Authors: Ozturk B.
De-Luna-Bugallo A.
Panaitescu E.
Chiaramonti A.N.
Liu F.
Vargas A.
Jiang X.
Kharche N.
Yavuzcetin O.
Alnaji M.
Ford M.J.
Lok J.
Zhao Y.
King N.
Dhar N.K.
Dubey M.
Nayak S.K.
Sridhar S.
Kar S.
Issue Date: 2015
Citation: 23
Abstract: In recent times, atomically thin alloys of boron, nitrogen, and carbon have generated significant excitement as a composition-tunable two-dimensional (2D) material that demonstrates rich physics as well as application potentials. The possibility of tunably incorporating oxygen, a group VI element, into the honeycomb sp2-type 2D-BNC lattice is an intriguing idea from both fundamental and applied perspectives. We present the first report on an atomically thin quaternary alloy of boron, nitrogen, carbon, and oxygen (2D-BNCO). Our experiments suggest, and density functional theory (DFT) calculations corroborate, stable configurations of a honeycomb 2D-BNCO lattice. We observe micrometer-scale 2D-BNCO domains within a graphene-rich 2D-BNC matrix, and are able to control the area coverage and relative composition of these domains by varying the oxygen content in the growth setup. Macroscopic samples comprising 2D-BNCO domains in a graphene-rich 2D-BNC matrix show graphene-like gate-modulated electronic transport with mobility exceeding 500 cm2 V?1 s?1, and Arrhenius-like activated temperature dependence. Spin-polarized DFT calculations for nanoscale 2D-BNCO patches predict magnetic ground states originating from the B atoms closest to the O atoms and sizable (0.6 eV < Eg < 0.8 eV) band gaps in their density of states. These results suggest that 2D-BNCO with novel electronic and magnetic properties have great potential for nanoelectronics and spintronic applications in an atomically thin platform. 2015 � The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.
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