Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 6: Electronic Structure and Spectroscopy I

CPP 6.8: Talk

Monday, March 27, 2006, 16:30–16:45, ZEU 114

Nanometer scale properties of self-assembled semiconductor quantum dot/dye hetero-arrays — •Mohamed Abdel-Motaleb¹, Edvard Zenkevich², Jörg Schuster¹, Abey Issac¹, Frank Cichos³, and Christian von Borczyskowski¹ — ¹Optical Spectroscopy and Molecular Physics, Institute of Physics, TU Chemnitz, D-09107 Chemnitz — ²Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, Minsk, Belarus — ³Photonics and Optical Materials, Institute of Physics, TU Chemnitz, D-09107 Chemnitz

One of the outstanding but inherent features of single quantum objects (molecules, quantum dots - QD) is the observation of luminescence intermittency. In recent experiments we have shown [1] [2] [3] that besides intramolecular properties (triplet states), photo-ejected charges cause intermittency dynamics on times scales over several orders of magnitude ranging from ms to h. These dynamics are related to QD photoluminescence intensities both of single particles and ensembles and are among others controlled by dielectric properties of the QD/dye arrays and/or the environment. This offers the possibility to investigate on a nanometer scale dielectric properties of functionalized organic molecules [4] self-assembled on semiconductor surfaces. Possible applications such as nanoscopic sensors will be discussed.

[1] Cichos et al. Phys. Rev. B, 70 , 1153141 (2004)

[2] Issac et al. Phys. Rev. B 71, 161302(R) (2005)

[3] Schuster et al. Appl. Phys. Lett., 87, 051915 (2005)

[4] Zenkevich et al. J. Phys. Chem. B 109, 8679 (2005)