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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kucheyev, S. O.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2007Energetic Processing of Interstellar Silicate Grains by Cosmic Rayscitations
- 2005Ion irradiation-induced disordering of semiconductorscitations
- 2004Ion-beam-defect processes in group-III nitrides and ZnOcitations
- 2004Dynamic annealing in III-nitrides under ion bombardmentcitations
- 2004Lattice damage produced in GaN by swift heavy ionscitations
- 2003Ion-beam-produced structural defects in ZnOcitations
- 2002Electrical isolation of ZnO by ion bombardmentcitations
- 2002Ion-beam-produced damage and its stability in AlN filmscitations
- 2002Structural disorder in ion-implanted AlxGa1-xNcitations
- 2001Effect of ion species on the accumulation of ion-beam damage in GaN
- 2001Electrical isolation of GaN by MeV ion irradiationcitations
- 2001The effects of ion mass, energy, dose, flux and irradiation temperature on implantation disorder in GaNcitations
- 2001Disordering and anomalous surface erosion of GaN during ion bombardment at elevated temperaturescitations
- 2000Ion-beam-induced porosity of GaNcitations
- 2000Polycrystallization and surface erosion of amorphous GaN during elevated temperature ion bombardmentcitations
- 2000Ion-beam-induced dissociation and bubble formation in GaNcitations
- 2000Damage buildup in GaN under ion bombardmentcitations
- 2000Surface disordering and nitrogen loss in GaN under ion bombardment
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article
Effect of ion species on the accumulation of ion-beam damage in GaN
Abstract
<p>Wurtzite GaN epilayers bombarded with a wide range of ion species (10 keV <sup>1</sup>H, 40 keV <sup>12</sup>C 50 keV <sup>16</sup>O, 600 keV <sup>28</sup>Si. 130 keV <sup>63</sup>Cu, 200 keV <sup>107</sup>Ag, 300 keV <sup>197</sup>Au, and 500 keV <sup>209</sup>Bi) are studied by a combination of Rutherford backscattering/channeling (RBS/C) spectrometry and cross-sectional transmission electron microscopy. Results show that strong dynamic annealing processes lead to a complex dependence of the damage-buildup behavior in GaN on ion species. For room -temperature bombardment with different ion species, bulk disorder, as measured by RBS/C, saturates at some level that is below the random level, and amorphization proceeds layer-by-layer from the GaN surface with increasing ion dose. The saturation level of bulk disorder depends on implant conditions and is much higher for light-ion bombardment than for the heavy-ion irradiation regime. In the case of light ions, when ion doses needed to observe significant lattice disorder in GaN are large (≳ 10<sup>16</sup> cm<sup>-2</sup>), chemical effects of implanted species dominate. Such implanted atoms appear to stabilize an amorphous phase in GaN and/or to act as effective traps for ion-beam-generated mobile point defects and enhance damage buildup. In particular, the presence of a large concentration of carbon in GaN strongly enhances the accumulation of implantation-produced disorder. For heavier ions, where chemical effects of implanted species seem to be negligible, an increase in the density of collision cascades strongly increases the level of implantation-produced lattice disorder in the bulk as well as the rate of layerby-layer amorphization proceeding from the surface. Such an increase in stable damage and the rate of planar amorphization is attributed to (i) an increase in the defect clustering efficiency with increasing density of ion-beam-generated defects and/or (ii) a superlinear dependence of ion-beam-generated defects, which survive cascade quenching, on the density of collision cascades. Physical mechanisms responsible for such a super-linear dependence of ion-beam-generated defects on collision cascade density are considered. Mechanisms of surface and bulk amorphization in GaN are also discussed.</p>