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Published on: December 21, 2015
Collector phase transitions during vapor-solid-solid nucleation of GaN nanowires
Caroline Chèze1, Lutz Geelhaar, Achim Trampert
1Paul-Drude-Institut für Festkorperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany. caroline.cheze@pdi-berlin.de
Abstract:
We investigate the nucleation of Ni-induced GaN nanowires by in situ and ex situ experiments. Three nucleation stages are evidenced. In the first two stages, different crystal structures of the Ni collectors are identified. Real-time monitoring of the Ga desorption allows the amount of Ga incorporated in the collectors to be quantified. A transition of their crystal structure prior to nanowire growth is found to be in agreement with the thermodynamically stable phase sequence of the relevant phase diagrams.
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