Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 22: Hybrid systems
HL 22.3: Vortrag
Dienstag, 26. Februar 2008, 10:00–10:15, EW 201
Photoresponse of Hybrids made of Carbon Nanotubes and CdTe Nanocrystals — •Bernd Zebli1, Hugo A. Vieyra1, Itai Carmeli2, Achim Hartschuh3, Jörg P. Kotthaus1, and Alexander W. Holleitner4 — 1Department für Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany — 2Department of Chemistry and Biochemistry, Tel-Aviv University, Tel-Aviv 69978, Israel — 3Department für Chemie, Physikalische Chemie, Butenandtstr. 5-13 E, 81377 Munich, Germany — 4Walter-Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany
We observe that the photoresponse of single-walled carbon nanotubes can be adjusted by the absorption characteristics of colloidal CdTe nanocrystals, which are bound to the side-walls of the carbon nanotubes via molecular recognition. To this end, the hybrid systems are characterized using charge transport measurements under resonant optical excitation of the carbon nanotubes and nanocrystals, respectively. We investigate the photoresponse of both ensembles of hybrid systems and single carbon-nanotube-nanocrystal-hybrids. The data suggest a bolometrically induced increase of the current in the carbon nanotubes, which is due to photon absorption in the nanocrystals.
We acknowledge financial support by the SFB 486 TPA1 of the Deutsche Forschungsgemeinschaft, the Center for NanoScience (CeNS), and the Nanosystems Initiative (NIM) in Munich.