Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 10: Light induced phenomena I
CPP 10.2: Talk
Monday, March 7, 2005, 10:00–10:15, TU C230
Photoconductivity of composite films of CdSe nanocrystals and C60 molecules — •A. Biebersdorf1, A. S. Susha1, A. L. Rogach1, T. A. Klar1, J. Feldmann1, D.V. Talapin2, and H. Weller2 — 1Photonics and Optoelectronics Group, Dep. of Physics and CeNS, Ludwig-Maximilians-Universität, Amalienstr. 54, 80799 Munich, Germany — 2Institute of Physical Chemistry, Univ. of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
Films of bare CdSe nanocrystals or bare C60 molecules generally show only a weak photoconductance. This is increased by three orders of magnitude in the composite films. The wavelength resolved photoconductance spectra closely follow the optical absorption spectra of the CdSe nanocrystals, allowing the tuning of spectral sensitivity of the photoconductance by size of nanocrystals. The increased photoconductivity in the composite films can be explained by the injection of photoexcited charge carriers from the CdSe nanocrystals into the C60 molecules.