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Open AccessArticle

3D Networks of Ge Quantum Wires in Amorphous Alumina Matrix

1
Rudjer Boskovic Institute, 10000 Zagreb, Croatia
2
National Institute of Chemistry, 1001 Ljubljana, Slovenia
3
Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1363; https://doi.org/10.3390/nano10071363
Received: 11 June 2020 / Revised: 3 July 2020 / Accepted: 8 July 2020 / Published: 13 July 2020
Recently demonstrated 3D networks of Ge quantum wires in an alumina matrix, produced by a simple magnetron sputtering deposition enables the realization of nanodevices with tailored conductivity and opto-electrical properties. Their growth and ordering mechanisms as well as possibilities in the design of their structure have not been explored yet. Here, we investigate a broad range of deposition conditions leading to the formation of such quantum wire networks. The resulting structures show an extraordinary tenability of the networks’ geometrical properties. These properties are easily controllable by deposition temperature and Ge concentration. The network’s geometry is shown to retain the same basic structure, adjusting its parameters according to Ge concentration in the material. In addition, the networks’ growth and ordering mechanisms are explained. Furthermore, optical measurements demonstrate that the presented networks show strong confinement effects controllable by their geometrical parameters. Interestingly, energy shift is the largest for the longest quantum wires, and quantum wire length is the main parameter for control of confinement. Presented results demonstrate a method to produce unique materials with designable properties by a simple self-assembled growth method and reveal a self-assembling growth mechanism of novel 3D ordered Ge nanostructures with highly designable optical properties. View Full-Text
Keywords: Ge quantum wires; 3D ordering; self-assembly; quantum wire network; quantum confinement Ge quantum wires; 3D ordering; self-assembly; quantum wire network; quantum confinement
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MDPI and ACS Style

Basioli, L.; Tkalčević, M.; Bogdanović-Radović, I.; Dražić, G.; Nadazdy, P.; Siffalovic, P.; Salamon, K.; Mičetić, M. 3D Networks of Ge Quantum Wires in Amorphous Alumina Matrix. Nanomaterials 2020, 10, 1363.

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