Abstract
The nucleation and evolution of InN nanowires in a self-catalyzed growth process have been investigated to probe the microscopic growth mechanism of the self-catalysis and a model is proposed for high pressure growth window at ~760 Torr. In the initial stage of the growth, amorphous InNx microparticles of cone shape in liquid phase form with assistance of an InNx wetting layer on the substrate. InN crystallites form inside the cone and serve as the seeds for one-dimensional growth along the favorable [0001] orientation, resulting in single-crystalline InN nanowire bundles protruding out from the cones. An amorphous InNx sheath around the faucet tip serves as the interface between growing InN nanowires and the incoming vapors of indium and nitrogen and supports continuous growth of InN nanowires in a similar way to the oxide sheath in the oxide-assisted growth of other semiconductor nanowires. Other InN 1D nanostructures, such as belts and tubes, can be obtained by varying the InN crystallites nucleation and initiation process.
Highlights
Indium nitride (InN) is currently receiving much attention, in large part due to its recently observed narrow band gap E.g of 0.7–0.9 eV [1,2,3]
We have investigated the InN nanowire nucleation and evolution in the self-catalyzed growth process in the processing window identified favorable for InN nanowire growth
Quench at the early stage of the growth revealed that isolated amorphous InNx microparticles of cone shape form in the initial stage of the growth
Summary
Indium nitride (InN) is currently receiving much attention, in large part due to its recently observed narrow band gap E.g of 0.7–0.9 eV [1,2,3]. Understanding the microscopic mechanism of the self-catalysis is of primary importance toward controlled growth of InN nanostructures with desired physical properties including morphology, lateral dimension, orientation, crystalline structure. We observed single-crystalline [0001] oriented InN nanowire bundles initiated from amorphous InNx microcones formed at the early stage of the growth.
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