Planar Field Emission Current from Individual Carbon Nanotubes

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Abstract:

Carbon nanotube (CNT) planar field emitters were fabricated on a SiO2/Si substrate. The anode, cathode and CNT all lay on the same substrate for the promising advantage of intergratibility with planar technology. The emission current was acquired in a scanning electron microscope (SEM). Despite the asymmetry (tip-electrode) of our field emission sample, a symmetrical IV curve consistent with the Fowler-Nordheim theory was acquired. Using Zener theory on quantum tunneling in insulators, the observed phenomenon was explained to be a possible leakage current through the insulating SiO2 instead of real field emission. Moreover, the simulated local electric fields at the emitter apex exclude the possibility of an accountable emission current. Our results are of great importance in studying planar field emission since it draws attention to avoid mistaking leakage current for the actual field emission current in planar field emission devices. Keywords:

Keywords: CARBON NANOTUBE; FINITE ELEMENT METHOD; LEAKAGE CURRENT; PLANAR FIELD EMISSION; ZENER TUNNELING

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/asl.2011.2049

Publication date: November 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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