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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.