Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Nanostructures at surfaces I
O 42.2: Talk
Wednesday, March 28, 2012, 10:45–11:00, MA 042
Pulsed laser deposition of ZnO nanostructures for hybrid solar cells — •Sven Käbisch1,2, Marc A. Gluba2, Norbert H. Nickel2, and Norbert Koch1,2 — 1Institut für Physik, Humboldt-Universität zu Berlin — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Hybrid solar cells benefit from the large optical absorption cross section of organic chromophores while effective charge transport is achieved through high mobility inorganic materials. Since exciton diffusion lengths in organic materials are typically shorter than ca. 10 nm, organic/inorganic interfaces with a nanoscale interdigitation are required. Zinc oxide (ZnO) readily forms nanostructures on various substrates. Pulsed laser deposition (PLD) of ZnO nanostructures is studied in detail with respect to process parameters like laser fluence, partial pressure of the oxygen process gas, substrate temperature and type of substrate. The laser fluence and the deposition temperature determine the density of nanostructures due to the control of nucleation and diffusion of particles on the surface. The substrate type and morphology determine the shape of the nanostructures, while the deposition pressure changes their alignment. Nanostructures with optimized morphology and density are fabricated and used as electron acceptor in hybrid solar cells. A light sensitive p-n-junction is demonstrated.