Effect of ageing on the luminescence intensity and lifetime of porous silicon: roles of recombination centers

✍ Scribed by Bui Huy; Phi Hoa Binh; Bui Quang Diep; Phi Van Luong

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 106 KB
• Volume: 17
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)00752-x

✦ Synopsis

Ageing e ect on the photoluminescence spectra and lifetime of porous silicon are analyzed in a set of samples containing particles with various sizes. The ageing causes a pronounced increase in the intensity from the sample containing large particles, whereas it causes only a small increase for the sample containing smaller ones. The origin of this phenomenon is the di erence in initial concentrations of non-radiative centers in the samples and their passivation in the air. The transition of emission mechanism from recombination between quantum conÿned states to recombination via radiative centers, as well as passivation levels, have no e ect on the dependence of the decay rate on emission energy. The received results reveal strong correlation between particle size, intensity and decay rate during the ageing.