Soda, Marcello and Rudolph, Andreas and Schuh, Dieter and Zweck, Josef and Bougeard, Dominique and Reiger, Elisabeth (2012) Transition from Au to pseudo-Ga catalyzed growth mode observed in GaAs nanowires grown by molecular beam epitaxy. Phys. Rev. B 85 (24), p. 245450.
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We investigate the correlation between the Ga concentration of the catalyst droplet and the adopted crystal structure of individual GaAs nanowires grown by molecular-beam epitaxy using Au as a catalyst material. Through a postgrowth analysis the Ga content of the catalyst droplet during growth is estimated and related to the observed crystal structure of the nanowires. Depending on the Ga concentration, we observe a transition from typical Au catalyzed to pseudo-Ga assisted nanowire growth: Nanowires with low Ga concentration of the catalyst droplet during growth form predominantly wurtzite crystal structures. For Ga concentrations higher than 75 at. %, which we refer to as the pseudo-Ga assisted growth mode, the probability to form zinc-blende segments is strongly enhanced owing to the reduced droplet surface energy of the catalyst.
|Date:||29 June 2012|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Josef Zweck|
Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||26 Jul 2012 09:37|
|Last Modified:||09 Apr 2013 13:31|