GaN layers and Al1xInxN/AlN/GaN heterostructures have been studied by scanning probe microscopy methods. Threading dislocations(TDs), originating from the GaN(0001) layer grown on sapphire, have been investigated. Using Current-Atomic Force Microscopy(C-AFM)TDs have been found to be highly conductive in both GaN and AlInN, while using semi-contact AFM (phase-imagingmode) indium segregation has been traced at TDs in AlInN/AlN/GaN heterostructures. It has been assessed that In segregation is responsible for high conductivity at dislocations in the examined heterostructures.
Structural and local electrical properties of AlInN/AlN/GaN heterostructures / A. Minj; D. Cavalcoli; A. Cavallini. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - STAMPA. - 407:(2012), pp. 2838-2840. [10.1016/j.physb.2011.08.035]
Structural and local electrical properties of AlInN/AlN/GaN heterostructures
CAVALCOLI, DANIELA;CAVALLINI, ANNA
2012
Abstract
GaN layers and Al1xInxN/AlN/GaN heterostructures have been studied by scanning probe microscopy methods. Threading dislocations(TDs), originating from the GaN(0001) layer grown on sapphire, have been investigated. Using Current-Atomic Force Microscopy(C-AFM)TDs have been found to be highly conductive in both GaN and AlInN, while using semi-contact AFM (phase-imagingmode) indium segregation has been traced at TDs in AlInN/AlN/GaN heterostructures. It has been assessed that In segregation is responsible for high conductivity at dislocations in the examined heterostructures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.