Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Symposium Semiconducting Nanoparticles for Nano-Optics and Optoelectronics

HL 52.2: Invited Talk

Friday, February 29, 2008, 11:00–11:30, ER 270

Silicon and Germanium Nanoparticles: Spectroscopy and Electronic transport — •Cedrik Meier, Stephan Lüttjohann, Matthias Offer, Sonja Hartner, Hartmut Wiggers, and Axel Lorke — CeNIDE-Center for NanoIntegration Duisburg-Essen, Lotharstraße 1,47057 Duisburg

Silicon nanoparticles are attractive candidates for photovoltaic and optoelectronics applications, as they allow to combine the advantages of a semiconducting material with the ease of handling of dispersed particles. However, for the realization of optoelectronic devices, one needs to optimize both, the optical efficiency of the emitter as well as the current transport in thin particle films.

In this talk, I will present spectroscopic results and discuss the fundamental limits of silicon nanoparticles as a quantum mechanical emitter in the strong confinement regime. Moreover, the excitonic fine structure in silicon nanoparticles which can be controlled via the temperature as an external parameter will be discussed.

Finally, results on electronic transport through nanoparticle films are presented. While the conductance of unsintered silicon nanoparticles is still unsufficient for most device applications, I will present recent results on magnetotransport through Germanium nanoparticle layers which are promising for applications.

Supported by the DFG via SFB 445-'Nanoparticles from the gas phase' and GRK 1240-'Nanotronics'.