Dresden 2006 – scientific programme
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HL: Halbleiterphysik
HL 36: Optical properties
HL 36.1: Talk
Wednesday, March 29, 2006, 16:15–16:30, POT 151
Temperature- and size-dependence of light absorption on silicon nanoparticles — •Andreas Gondorf1, Stephan Lüttjohann1, Cedrik Meier1, Axel Lorke1, and Hartmut Wiggers2 — 1Laboratorium für Festkörperphysik, Universität Duisburg-Essen, 47048 Duisburg — 2Institut für Verbrennung und Gasdynamik, Universität Duisburg-Essen, 47048 Duisburg
Silicon nanoparticles with diameters d< 8 nm show photoluminescence in the IR-red region of the spectrum. In temperature dependent studies it is found that the PL intensity exhibits a maximum around T=80K. It has been proposed that an energy splitting of the exciton state is responsible for this. However, as silicon is an indirect semiconductor one might argue that phonon emission or absorption processes play a decisive role in the temperature behaviour of the PL. Therefore, we have studied absorption spectra of silicon nanoparticles in the temperature range between T=30K and 300K in order to clarify the phonon contribution.