Year: 2025
Type: article
Abstract: A silicon wafer was anodized to form porous silicon and then annealed followed by a chemical treatment. Annealed porous silicon has little efficiency of photoluminescence. The chemical treatments yielded photoluminescence at around 850 nm. The IR and ESR spectra showed that annealing forms silicon oxide with Pb-center and a-center levels, which results in the suppression of photoluminescence. After the chemical treatment, silicon oxide was removed and the two kinds of centers are disappeared. It possibly enhanced the photoluminescent efficiency. Further chemical treatment showed a blue shift of the photoluminescence. These results well support a quantum effect and suggest that the two kinds of centers in oxide are a factor of suppressing photoluminescence.
Authors: Masato Ohmukai, Kouichi Okada
Institution: National Institute of Technology, Akashi College
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4411657626