Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Poster 2
HL 48.13: Poster
Donnerstag, 26. März 2009, 15:00–17:30, P2
Photoluminescence of extremely dilute Si nanoparticle films — •Matthias Offer1, Cedrik Meier1,3, Martin Geller1, Axel Lorke1, and Hartmut Wiggers2 — 1Experimental Physics and CeNIDE, University of Duisburg-Essen, Duisburg — 2IVG and CeNIDE, University of Duisburg-Essen, Duisburg — 3Experimental Physics, University of Paderborn
Light-emitting silicon nanoparticles are attractive candidates for future optoelectronic applications. For the realization of such devices, a detailed knowledge of the recombination dynamics is an important prerequisite. The photoluminescence (PL) of silicon nanoparticles exhibits an interesting exitonic fine structure with a bright and a dark state, which, surprisingly, have very similar radiative recombination lifetimes [1]. To elucidate the intriguing excitonic properties of Si nanoparticles, it is highly desirable to investigate single particles or few-particle ensembles to answer questions regarding homogeneous line broadening and Zeeman shift. We have dispersed Si nanoparticles in organic solvents and deposit extremely dilute films of Si particles on arbitrary surfaces. These can be covered by metallic micro-apertures ( ≈ 1 µ m in diameter), which make it possible to study the optical properties of ensembles of about 100 particles and below. Furthermore, a scanning micro-PL setup was designed and realized to map out the local optical properties of nanoscopic semiconductor structures. First results of spatially resolved PL on nanoparticles will be presented and compared to spectra of large-scale ensembles.
[1] S. Lüttjohann et al., Europhys. Lett. 79, 37002 (2007)