Journal
APPLIED PHYSICS LETTERS
Volume 88, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2200157
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We have investigated the growth temperature dependence of the structural properties of GaN deposited on O-polarity ZnO (000 (1) over bar) using pulsed laser deposition. We have found that atomically abrupt GaN/ZnO heterointerfaces are obtained at growth temperatures reduced to below 500 degrees C. We have also found that GaN grown at room temperature (RT) exhibits a Ga polarity while that grown at 700 degrees C exhibits a N polarity. However, it is possible to grow Ga-polarity GaN at 700 degrees C by the introduction of a RT buffer layer. First principles calculations well explain how Ga-polarity GaN may be grown on atomically flat O-polarity ZnO surfaces at low temperatures. (c) 2006 American Institute of Physics.
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