Year: 1995
Type: article
Abstract: We have synthesized, by Molecular Beam Epitaxy (MBE), Si/CaF 2 multilayers which are optically active at room temperature. The photoluminescence spectra present a blue shift for decreasing Si layer thickness, in analogy to those obtained from porous silicon when the porosity is increased. We find a critical dependence of the photoluminescence efficiency on the thickness of the Si layers. We compare the experimental results to ab initio calculations of the band structure of Si/CaF 2 multilayers which predict the band gap opening and the presence of confined and interface states leading to a quasi-direct band gap.
Source: Europhysics Letters (EPL)
Authors: F. Arnaud d'Avitaya, L Vervoort, F Bassani, S Ossicini, A Fasolino, F Bernardini
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1976015337