Til hovedinnhold

Surface effects and optical properties of self-assembled nanostructured a-Si:Al

Surface effects and optical properties of self-assembled nanostructured a-Si:Al

Kategori
Tidsskriftspublikasjon
Sammendrag
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
Oppdragsgiver
  • Norges forskningsråd / 231658
  • Norges forskningsråd / 245963
Språk
Engelsk
Forfatter(e)
Institusjon(er)
  • Universitetet i Oslo
  • Universitetet i Oslo
  • SINTEF Industri / Bærekraftig energiteknologi
År
2019
Publisert i
Nanomaterials
ISSN
2079-4991
Årgang
9
Hefte nr.
8
Side(r)
1 - 12