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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.39: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
Electronic properties and morphology of Cu-Phthalocyanine - C60 composite mixtures — •Friedrich Roth1, Cosmin Lupulescu2, Tiberiu Arion1,3, Erik Darlatt4, Alexander Gottwald4, and Wolfgang Eberhardt1,2 — 1Center for Free-Electron Laser Science / DESY, Notkestraße 85, D-22607 Hamburg, Germany — 2Inst. of Optics and Atomic Physics, TU Berlin, Straße des 17. Juni 135, D-10623 Berlin, Germany — 3Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 4Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, D-10587 Berlin, Germany
Phthalocyanines in combination with C60 are benchmark materials for organic solar cells. Here we have studied the morphology and electronic properties of co-deposited mixtures (blends) of these materials forming a bulk heterojunction as a function of the concentration of the two constituents. For a concentration of 1:1 of CuPc:C60 a phase separation into about 100 nm size domains is observed, which results in electronic properties similar to layered systems. For low C60 concentrations (10:1 CuPc:C60) the morphology, as indicated by Low-Energy Electron Microscopy (LEEM) images, suggests a growth mode characterized by (amorphous) domains of CuPC, whereby the domain boundaries are decorated with C60. Despite of these markedly different growth modes, the electronic properties of the heterojunction films are essentially unchanged.