Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.43: Poster

Monday, March 26, 2012, 17:30–20:00, Poster A

Functionalized Luminescent Silicon Quantum Dots — •Marc Wegmann, Georg Brehm, and Carola Kryschi — Friedrich-Alexander University of Erlangen, Egerlandstr. 3, 91058 Erlangen, Germany

One of the central challenges in fabrication of luminescent Si quantum dots (SiQDs) tailored for nano-optolelectronics is to functionalize their surfaces with electronically efficiently coupled molecules that mediate carrier injection into the bulk and allow to optically control charge separation as well as luminescence properties of the bulk. In this contribution we will present a detailed spectroscopy study of bright green-luminescent alkenyl-passivated SiQDs with were prepared via a four-step wet-chemistry synthesis route. The sizes, cristallinity and shapes as well as the surface structures of differently functionalized SiQDs were examined employing high-resolution transmission electron microscopy (HRTEM) and FTIR spectroscopy, respectively. Stationary and time-resolved photoluminescence spectroscopy experiments provided essential information of luminescent surface and bulk states. The interplay between electronically excited molecular states and conduction band states was examined upon directly monitoring photo-excited carrier dynamics with femtosecond transient absorption and luminescence up conversion spectroscopy.