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• W2890107541 abstract "Abstract Nitride materials (AlN, GaN, InN and their alloys) are commonly used in optoelectronics, high-power and high-frequency electronics. Polarity is the essential characteristic of these materials: when grown along c-direction, the films may exhibit either N- or metal-polar surface, which strongly influences their physical properties. The possibility to manipulate the polarity during growth allows to establish unique polarity in nitride thin films and nanowires for existing applications but also opens up new opportunities for device applications, e.g., in non-linear optics. In this work, we show that the polarity of an AlN film can intentionally be inverted by applying an oxygen plasma. We anneal an initially mixed-polar AlN film, grown on sapphire substrate by metal-organic vapor phase epitaxy (MOVPE), with an oxygen plasma in a molecular beam epitaxy (MBE) chamber; then, back in MOVPE, we deposit a 200 nm thick AlN film on top of the oxygen-treated surface. Analysis by high-resolution probe-corrected scanning transmission electron microscopy (STEM) imaging and electron energy-loss spectroscopy (EELS) evidences a switch of the N-polar domains to metal polarity. The polarity inversion is mediated through the formation of a thin Al x O y N z layer on the surface of the initial mixed polar film, induced by the oxygen annealing." @default.
• W2890107541 created "2018-09-27" @default.
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• W2890107541 date "2018-09-20" @default.
• W2890107541 modified "2023-10-13" @default.
• W2890107541 title "Intentional polarity conversion of AlN epitaxial layers by oxygen" @default.
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• W2890107541 doi "https://doi.org/10.1038/s41598-018-32489-w" @default.
• W2890107541 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6147946" @default.
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