期刊
DIAMOND AND RELATED MATERIALS
卷 19, 期 7-9, 页码 956-959出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2010.02.037
关键词
Graphene; Diamond; Plasma CVD; Field emission; Carbon nanotubes
Field emission performance of nitrogen-incorporated vertically-aligned graphene layers, so called carbon nanowalls (CNWs), is found to depend upon their electrical conduction properties. The CNW samples with n-type conduction exhibit near-ideal Ohmic contacts with various metals such as Cu, Ti, and Au, regardless of the work function of the metals. The high resistivity CNWs for lower deposition temperatures (T-D) show semiconducting behavior in the Arrhenius plots, while the low resistivity CNWs for higher T-D show semi-metallic behavior. The emission turn-on field versus T-D has a very similar trend to the bulk resistivity versus T-D, and is reduced down to about 3 V/mu m when the resistivity reaches a minimum (3.0 x 10(-3) Omega cm). The lower turn-on field for semi-metallic CNWs is attributed to an upward shift of the emission level, which is responsible for a decrease in the surface potential barrier height for emission. (C) 2010 Elsevier B.V. All rights reserved.
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