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HL: Fachverband Halbleiterphysik

HL 65: Poster: Organic electronics and photovoltaics (CPP; jointly with HL, O)

HL 65.14: Poster

Mittwoch, 13. März 2013, 16:30–18:30, Poster C

Nucleation and Growth of Copper Phthalocyanine from Solution — •Fatemeh Ghani and Hans Riegler — Max Planck Institute f. Colloid & Interfaces, Potsdam-Golm, Germany

Silver nanoparticles are usually synthetized by physical vapor deposition or through compli-cated methods like ion implantation or wet chemistry. A self-assembly method is of interest due to its simplicity and cost-efficiency [202]. By combining physical vapor depo-sition and solvent treatment (spin casting), We applied a simple hybrid method to produce ap-propriate silver nanoclusters for organic solar cells. Through evaporation of the silver film (~ 5 nm), nanoclusters (of ~4 nm height and ~ 25 nm widths) cover the surface. By spin casting the solvent, a thin liquid film covers the evaporated film. The silver clusters redistribute in the solution film and by evaporation of the solvent, they aggregate in larger clusters (~20 nm height and ~45 nm width). The process is influenced via physical parameters of growth from solution like evaporation rate and liquid film concentration. We show that the size of the clusters can be controlled by the thickness of the deposited film, type of solvent, and spin casting speed. We applied this method to increase the efficiency of a hybrid solution processed and vac-uum deposited unsubstituted copper phthalocyanine/fullerene organic solar cells.