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Voltage-dependent field emission energy distribution measurements (V-FEED) on wide bandgap cold cathodes

Field emission mechanisms of cold cathodes were studied by combining classical I-V characterization with field emission energy distribution (FEED) analysis. Electrochemically sharpened Mo tips with typical radii of curvature of 100 nm were coated with fine powders of nominally intrinsic wide bandgap materials (diamond and cubic boron nitride) by an electrophoretic procedure. Voltage-dependent field emission energy distribution (V-FEED) measurements were used to evidence field induced band bending and to extrapolate data to flat band condition.