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Synthesis of a GaN nanolayer on (001) GaAs by N ion implantation

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Publication date: 30 November 2017
Source:Thin Solid Films, Volume 642
Author(s): H. Coelho-Júnior, J.H.R. dos Santos, R.L. Maltez
N+ ions at 50keV were implanted up to a fluence of 3×1017 cm2 into a (001) GaAs substrate capped by a 125-nm Si3N4 layer obtained by sputtering deposition. The Si3N4/GaAs system was kept at 450°C during ion implantation. Nitrogen bubbles were present on both sides of the Si3N4/GaAs interface of the as-implanted sample, which showed a layered structure. In addition, the N-implanted region on the GaAs side was almost amorphous. By subsequent thermal annealing at 850°C for 5min under N2 flow, we were able to synthesize a GaN nanolayer with the wurtzite structure. We also identified cubic-structured GaN with a lattice parameter of (0.42±0.01) nm, which is significantly smaller than the one reported in the literature (0.45nm) for the GaN zinc-blend phase.


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