Journal
APPLIED PHYSICS LETTERS
Volume 102, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4805027
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The electron microscopy was used to characterize the AlN interlayer in AlxGa1-xN/AlN/GaN heterostructures grown by plasma assisted molecular beam epitaxy (PAMBE). We show that the AlN interlayer grown by PAMBE is without gallium and oxygen incorporation and the interfaces are coherent. The AlN interlayer has the ABAB stacking of lattice planes as expected for the wurtzite phase. High purity of AlN interlayer with the ABAB stacking leads to larger conduction band offset along with stronger polarization effects. Our studies show that the origin of lower sheet resistance obtained by PAMBE is the purity of AlN interlayer. (C) 2013 AIP Publishing LLC.
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