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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Local dC/dV–Vtip curves measured on an array of 5 × 5 positions of the diamond-tip on the AlN surface. The flatband voltage VFB = 0.3V for the diamond tip/AlN/GaN heterostructure is indicated. The experimental configuration for SCM measurements is schematically illustrated in the inset.