Direct investigation of localized leakage currents in GaN-on-sapphire pn-diodes. - Kinstler, Alexander D.; Neumann, Richard; Taylor, Aidan Arthur; Besendörfer, Sven; Meissner, Elke; Weingärtner, Roland; Brunner, Frank; Brusaterra, Enrico; Bahat Treidel, Eldad; Schulze, Jörg (Scientific Reports, 2025)