Surface patterning of GaAs under irradiation with very heavy polyatomic Au ions


Surface patterning of GaAs under irradiation with very heavy polyatomic Au ions

Bischoff, L.; Böttger, R.; Heinig, K.-H.; Facsko, S.; Pilz, W.

Self-organization of surface patterns on GaAs under irradiation with very heavy polyatomic Au ions has been found. The patterns depend on the ion mass, the substrate temperature as well as the incidence angle of the ions. At room temperature, under normal incidence the surface remains flat, whereas above 200 °C nanodroplets of Ga appear after irradiation with monatomic, biatomic as well as triatomic Au ions of kinetic energies in the range of 10 to 30 keV per atom. In the intermediate temperature range of 100 to 200 °C meander- and dot-like patterns form, which are not related to Ga excess. Under oblique ion incidence up to 45° from the surface normal, at room temperature the surface remains flat for mon- and polyatomic Au ions. For bi- and triatomic ions, in the range 60° ≤ a ≤ 70° ripple patterns have been found, which become shingle-like for a ≥ 80°, whereas the surface remains flat for monatomic ions.

Keywords: surface morphology; ripples; nanodots; FIB; polyatomic ions; GaAs; Au

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Permalink: https://www.hzdr.de/publications/Publ-19420
Publ.-Id: 19420