Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Focus Session: Functional Semiconductor Nanowires II (organized by HL)
TT 24.6: Talk
Monday, March 16, 2015, 16:30–16:45, EW 201
Luminescence dynamics of hybrid ZnO nanowire/CdSe quantum dot structures — •Stephanie Bley1, Friederike Albrecht1, Michael Diez1, Alejandra Castro-Carranza1, Jürgen Gutowski1, and Tobias Voss2 — 1Institute of Solid State Physics, Semiconductor Optics, University of Bremen, 28359 Bremen, Germany — 2Institute of Semiconductor Technology , Braunschweig University of Technology, 38106 Braunschweig, Germany
The development of cheap and efficient hybrid solar cells, which show high absorption, and a fast and efficient conversion of the incident photon energy into electrical energy is of paramount interest for regenerative energy applications. To achieve that, colloidal CdSe quantum dots with different organic linker molecules were attached to ZnO nanowires to study the luminescence dynamics and the electron transfer inside these hybrid nanostructures via time-resolved photoluminescence and photoconductivity experiments. Photo-induced electron tunneling from an excited state of the QD into the nanowire becomes visible by a particular decrease of the QD decay time. This will be discussed by introducing an appropriate rate equation model. The electron tunneling is further clearly verified by a strong enhancement of the photocurrent which can be controlled by different linker molecule lengths. Further, the influence of surface oxidation on the luminescence dynamics and electron transfer will be discussed by studying polymethylmethacrylate- and polystyrene-passivated hybrid structures.