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Measurement of the Electrostatic Edge Effect in Wurtzite GaN Nanowires



Alex Henning, Benjamin Klein, Kristine A. Bertness, Paul T. Blanchard, Norman Sanford, Yossi Rosenwaks


The electrostatic effect of the hexagonal corner on the electronic structure in wurtzite GaN nanowires (NWs) was directly measured using Kelvin probe force microscopy (KPFM). By correlating electrostatic simulations with the measured potential difference between the nanowire face and the hexagonal vertices, the surface state concentration and band bending of GaN NWs were estimated. The surface band bending is important for an efficient design of high electron mobility transistors and for optoelectronic devices based on GaN NWs. This methodology provides a way to extract NW parameters without making assumptions concerning the electron affinity. We are taking advantage of electrostatic modeling and the high precision that KPFM offers to elegantly circumvent a major source of uncertainty in determining the surface band bending.
Applied Physics Letters


GaN nanowires, scanning Kelvin probe force microscopy, surface band bending


Henning, A. , Klein, B. , Bertness, K. , Blanchard, P. , Sanford, N. and Rosenwaks, Y. (2014), Measurement of the Electrostatic Edge Effect in Wurtzite GaN Nanowires, Applied Physics Letters, [online], (Accessed June 17, 2024)


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Created November 23, 2014, Updated October 12, 2021