Blistering of GaAs by low keV H, D, and He ions
- INRS-EMT, Universite du Quebec, 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2 (Canada)
The thermally activated blistering of the GaAs (100) surface after 5- and 10 keV H, D, and He ion implantations was investigated. A large isotope effect is observed as the critical blistering fluences are two to three times higher for D than for H ions. Blistering and exfoliation are also obtained for very low He ion fluence, contrary to Si which is impervious to He blistering in the same conditions. The exfoliated crater depth depends strongly on the He fluence, varying, at 10 keV, from 75{+-}10 nm (for 1.6x10{sup 16} He/cm{sup 2}), consistent with the ion projected range determined by computation, to a saturation value of 155{+-}10 nm for doses >4x10{sup 16} He/cm{sup 2}. Our results suggest that the fracture leading to cleavage is triggered at a local He concentration of about 2 at. %, where dislocations and nanocavities are created.
- OSTI ID:
- 20706429
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 21 Vol. 87; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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