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Dependence of the singlet oxygen photosensitization efficiency on morphology of porous silicon

✍ Scribed by Ryabchikov, Yu. V. ;Belogorokhov, I. A. ;Vorontsov, A. S. ;Osminkina, L. A. ;Timoshenko, V. Yu. ;Kashkarov, P. K.

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 271 KB
Volume: 204
Category: Article
ISSN: 0031-8965
DOI: 10.1002/pssa.200674306

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✦ Synopsis

Abstract

We investigate the effect of oxygen molecule adsorption on the photoluminescence of porous silicon films of different porosity. The experimental results are explained by the photosensitization of singlet oxygen generation due to the energy transfer from excitons confined in Si nanocrystals to O~2~ molecules adsorbed on the Si nanocrystal surface. The energy transfer time and photosensitization efficiency are found to depend on porosity of the samples. The singlet oxygen generation efficiency increases strongly for porous silicon with high (>80%) porosity. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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