Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 31: Organic thin films I
DS 31.4: Talk
Thursday, March 29, 2012, 12:00–12:15, H 0111
Hybrid solution/vacuum-processed bilayer heterojunction organic solar cells: Nucleation and growth of copper phthalocyanine from solution — •Fatemeh Ghani1, Ivelin Bochukov2, Konstantinos Fostiropoulos2, and Hans Riegler1 — 1Max Planck Institute f. Colloid & Interfaces, Potsdam-Golm, Germany — 2Helmholtz-Zentrum, Berlin, Germany
Unsubstituted metal phthalocyanines(M-Pc) are used as electron donor in vacuum-processed organic solar cell(OSC). However, low cost wet-deposition techniques like spin coating provide several parameters to produce appropriate structures concerning nucleation and growth from solution. But unfortunately fewer solvents for M-Pcs are known. Based on a detailed solubility study[1], we prepare solution-processed M-Pc films. Structures of particular interest are thin films of unsubstituted copper phthalocyanine(CuPc) deposited by spin coating or dip coating of the trifluoroacetic acid solution. By evaporation of the solvent, the molecules aggregate into bundles of fibers of 1-2 nm thickness and μm length on the substrate. We show that the size and form of the structures can be controlled systematically by varying nucleation and growth parameter such as temperature, solution concentration and solvent mixture. We used the solution-processed CuPc film in a hybrid solution/vacuum-processed OSC and studied the power efficiency as a function of CuPc film-thickness.
[1] Ghani, F.; Kristen, J.; Riegler, H., Solubility properties of unsubstituted metal phthalocyanines in different types of solvents, J. Chem. Eng. Data(in press).