Defects at nitrogen site in electron-irradiated AlN

Son, N. T.*; Gali, A.*; Szab, .*; Bikermann, M.*; Oshima, Takeshi; Isoya, Junichi*; Janzn, E.*

Applied Physics Letters, 98(24), p.242116_1 - 242116_3, 2011/06

https://doi.org/10.1063/1.3600638

AlN samples were irradiated with 2 MeV electrons, and defects in the AlN were measured using an electron paramagnetic resonance (EPR). As a result, a defect center, labeled EI-1, with an electron spin S=1/2 and a clear hyperfine hf structure was observed. The hf structure was shown to be the interaction between the electron spin and the nuclear spins of four A nuclei with the hf splitting varying between 6.0 and 7.2 mT. By the Comparison between the hf data obtained from EPR and supercell calculations, we concluded that the EI-1 defect is the best candidate for the neutral nitrogen vacancy in AlN.