GaAs/GaP superlattice nanowires: growth, vibrational and optical properties

Arif, Omer and Zannier, Valentina and Rossi, Francesca and De Matteis, Diego and Kress, Katharina and De Luca, Marta and Zardo, Ilaria and Sorba, Lucia. (2023) GaAs/GaP superlattice nanowires: growth, vibrational and optical properties. Nanoscale, 15 (3). pp. 1145-1153.

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Official URL: https://edoc.unibas.ch/93708/

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Nanowire geometry allows semiconductor heterostructures to be obtained that are not achievable in planar systems, as in, for example, axial superlattices made of large lattice mismatched materials. This provides a great opportunity to explore new optical transitions and vibrational properties resulting from the superstructure. Moreover, superlattice nanowires are expected to show improved thermoelectric properties, owing to the dominant role of surfaces and interfaces that can scatter phonons more effectively, reducing the lattice thermal conductivity. Here, we show the growth of long (up to 100 repetitions) GaAs/GaP superlattice nanowires with different periodicities, uniform layer thicknesses, and sharp interfaces, realized by means of Au-assisted chemical beam epitaxy. By optimizing the growth conditions, we obtained great control of the nanowire diameter, growth rate, and superlattice periodicity, offering a valuable degree of freedom for engineering photonic and phononic properties at the nanoscale. As a proof of concept, we analyzed a single type of superlattice nanowire with a well-defined periodicity and we observed room temperature optical emission and new phonon modes. Our results prove that high-quality GaAs/GaP superlattice nanowires have great potential for phononic and optoelectronic studies and applications.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Material Physics (Zardo)
UniBasel Contributors:Zardo, Ilaria and de Matteis, Diego and Kress, Katharina and De Luca, Marta
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Royal Society of Chemistry
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Mar 2023 14:20
Deposited On:16 Mar 2023 14:20

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