Bieker, Johannes ; Roustaie, Farough ; Schlaak, Helmut F. ; Langer, Christoph ; Schreiner, Rupert ; Lotz, Marcel ; Wilfert, Stefan (2018)
Field emission characterization of in situ deposited gold nanocones with variable cone densities.
In: Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics, 36 (2)
doi: 10.1116/1.5009504
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

For the fabrication of field emitter cathodes with metallic nanocones, an in situ fabrication technique based on electrodeposition in an ion track etched polymer template was used. Three samples with nanocones made of gold and different cone densities were deposited on a circular electrode with a diameter of 2.5mm, using templates with pore density of 6x10^4 , 4x10^5 , and 1x10^6 cones/cm^2 . The cones had a height of 24 mum, a base diameter between 3 and 3.75 mum, and a tip diameter below 500 nm. Integral field emission measurements revealed onset fields of down to 3.1 V/mum and average field enhancement factors of up to 1240. For one sample, the maximum emission current from the cathode reached 142.2 muA at an applied voltage of 338V between cathode and extraction grid, which had a distance of 50 mum. To investigate the stability of the field emission current, cumulative long-term measurements were performed for over 50h. A stable emission current of (31.0 +/- 1.3) muA at an average applied voltage of 290V (E = 5.8V/mum) was observed. For currents above 100 muA, a decrease of the current and therefore a degradation of the emitter structures occurred.

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