Raman characterization of Mg<sup>+</sup> ion-implanted GaN - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2004

Raman characterization of Mg+ ion-implanted GaN

Résumé

Mg+ ions were implanted at room temperature in n-type hexagonal GaN for the device isolation purposes. The implantation dose varied from 7.5 × 1012 to 1016 ions cm-2. We performed resonance Raman spectroscopy and DC electrical measurements in order to monitor the structural and electrical changes of non-annealed and annealed implanted GaN samples. Annealing was carried out at 900 °C for 30 s, these conditions being used to achieve good Ohmic contacts. The aim was to determine, on the one hand, the influence of ion doses on the device isolation and, on the other, to establish the order of the technological steps which should be made between ion implantation and Ohmic contact annealing. On increasing the implantation dose from 7.5 × 1012 to 2 × 1014 ions cm-2, an increase in the electrical isolation and a decrease in the photoluminescence (PL) were observed. For the highest dose, the implanted layer became conductive owing to a hopping mechanism and only the first-order phonon lines remained observable. After annealing, the implanted samples became conductive and the PL reappeared or increased compared with the non-annealed samples at same implantation doses, except for the sample implanted at the highest dose, which became insulating. Then, it is possible to achieve device electrical isolation by using a lower ion dose without thermal annealing or using a higher ion dose with thermal annealing.
Fichier non déposé

Dates et versions

hal-00269272 , version 1 (02-04-2008)

Identifiants

Citer

B. Boudart, Y. Guhel, J.C. Pesant, P. Dhamelincourt, M.A. Poisson. Raman characterization of Mg+ ion-implanted GaN. Journal of Physics: Condensed Matter, 2004, 16, pp.S49-S55. ⟨10.1088/0953-8984/16/2/006⟩. ⟨hal-00269272⟩
38 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More