Determining the work function of a carbon-cone cold-field emitter by in situ electron holography

Abstract : Cold-field emission properties of carbon cone nanotips (CCnTs) have been studied in situ in the transmission electron microscope (TEM). The current as a function of voltage, i(V), was measured and analyzed using the Fowler–Nordheim (F–N) equation. Off-axis electron holography was employed to map the electric field around the tip at the nanometer scale, and combined with finite element modeling, a quantitative value of the electric field has been obtained. For a tip-anode separation distance of 680 nm (measured with TEM) and a field emission onset voltage of 80 V, the local electric field was 2.55 V/nm. With this knowledge together with recorded i(V) curves, a work function of 4.8 ± 0.3 eV for the CCnT was extracted using the F–N equation.
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Submitted on : Tuesday, January 10, 2017 - 9:47:26 AM
Last modification on : Monday, May 20, 2019 - 4:44:02 PM

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Ludvig de Knoop, Florent Houdellier, Christophe Gatel, Aurélien Masseboeuf, Marc Monthioux, et al.. Determining the work function of a carbon-cone cold-field emitter by in situ electron holography. Micron, Elsevier, 2014, 63, pp.2--8. ⟨10.1016/j.micron.2014.03.005⟩. ⟨hal-01430588⟩

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