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Field emission from three-dimensional epitaxial grown GaN-microrods

  • A novel three-dimensional epitaxial technique allows on patterned substrates the realization of gallium nitride pillars, also known as nano- and microrods. The typical dimensions of the microrods are in the range of one micron for the radius of the hexagonal footprint and about 10 μm in height. The microrods consist of a semiconductor heterostructure with an n GaN core, a n-GaN shell, a p GaN shell and an intermediate quantum well layer. The field emission properties were investigated in diode configuration by integral field emission measurements in a vacuum chamber at pressures around 10 -9 mbar. The spacer was mica with a thickness of 50 μm. A metallized fine-meshed nitride grid (or a metallized Si-grid) was used as anode. A current of about 1 μA at a voltage of 1250 V (1750 V) was measured. An onset field of about 12.5 MV/m (20 MV/m) and field enhancement factors in the range of 200 to 500 (150 to 300) were found. The investigation with the fine-meshed grid showed an expected pronounced saturation region.

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Metadaten
Author:Robert Damian ŁawrowskiORCiD, Christoph LangerORCiD, Christian PrommesbergerORCiD, Rupert SchreinerORCiDGND
DOI:https://doi.org/10.1109/IVNC.2016.7551477
ISSN:2380-6311
Parent Title (English):29th International Vacuum Nanoelectronics Conference (IVNC), 2016, 11-15 July, Vancouver, BC, Canada
Publisher:IEEE
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2016
Release Date:2021/05/31
Tag:GaN; LED; field emission
First Page:87
Last Page:88
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Fakultät Angewandte Natur- und Kulturwissenschaften / Labor Mikrosensorik
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme