کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1552621 1513205 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ab-initio study of the Y adsorption and YN formation on the GaN(0001¯): Diffusion pathways and stability
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Ab-initio study of the Y adsorption and YN formation on the GaN(0001¯): Diffusion pathways and stability
چکیده انگلیسی
Yttrium (Y) adsorption and yttrium nitride (YN) thin film formation on the GaN(0001¯) surface are investigated using first principles total energy calculations. Results show that for Ga rich conditions the most stable configuration for Y adsorption is at a Bridge site. Nudged elastic band calculations show that the Y diffusion through the GaN surface is possible with low energy barriers. However, the most stable configuration corresponds to the geometry in which the Y atom migrates in to the first layer, forming an YN pair and displacing a Ga atom to the T4(2) site. Also, it is found that the increase of Y atoms up to a full monolayer is not energetically favorable, then the formation of an Y layer on top of the surface is not possible. However, under N-rich conditions the formation of a cubic-like YN bilayer above the surface becomes stable. Total and partial density of states show that the formation of YN on top of the Ga-terminated surface modify the electronic properties. Nevertheless, metallic behavior remains after YN formation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 96, August 2016, Pages 67-74
نویسندگان
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