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Surface Effects and Optical Properties of Self-Assembled Nanostructured a-Si:Al

1
Department of Physics/Centre for Materials Science and Nanotechnology, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway
2
SINTEF Industry, P.O. Box 124 Blindern, 0314 Oslo, Norway
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1106; https://doi.org/10.3390/nano9081106
Received: 4 July 2019 / Revised: 26 July 2019 / Accepted: 30 July 2019 / Published: 1 August 2019
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Abstract

We present a study of the surface effects and optical properties of the self-assembled nanostructures comprised of vertically aligned 5 nm-diameter Al nanowires embedded in an amorphous Si matrix (a-Si:Al). The controlled (partial) removal of Al nanowires in a selective etching process yielded nanoporous a-Si media with a variable effective surface area. Different spectroscopy techniques, such as X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometry and photoluminescence (PL), have been combined to investigate the impact of such nanostructuring on optical absorption and emission properties. We also examine long-term exposure to air ambient and show that increasing level of surface oxidation determines the oxide defect-related nature of the dominant PL emission from the nanoporous structures. The role of bulk, nanosize and surface effects in optical properties has been separated and quantified, providing a better understanding of the potential of such nanoporous a-Si:Al structures for future device developments. View Full-Text
Keywords: amorphous silicon; self-assembly; aluminium; nanowires; nanoporous; photoluminescence; vibronic modes amorphous silicon; self-assembly; aluminium; nanowires; nanoporous; photoluminescence; vibronic modes
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Kjeldstad, T.; Thøgersen, A.; Stange, M.; Jensen, I.T.; Monakhov, E.; Galeckas, A. Surface Effects and Optical Properties of Self-Assembled Nanostructured a-Si:Al. Nanomaterials 2019, 9, 1106.

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