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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.