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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 35.66: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
Solution-processed small molecule absorber layer for organic photovoltaics — •Matthias Saalfrank, Ludwig Bormann, Christian Körner, Lars Müller-Meskamp, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden, Deutschland
Organic solar cells (OSCs) based on small molecules are commonly processed by vacuum deposition, while for polymer OSCs solution-processing (e.g. spin-coating) is the means of choice. Since the latter technique is also more promising for processing of small molecules in terms of low-cost mass production of organic photovoltaics, it is investigated in this work.
As a first step towards all-solution-processed small molecule OSC we deposit the active layer materials by spin-coating the donor-acceptor blend from solution onto ITO-coated glass substrates covered with an insoluble metal oxide transport layer (MoO3 as hole transport layer for normal pin structures, TiO2 as electron transport layer for inverted nip structures). Subsequently, the transport layer and aluminium electrode are deposited by vacuum evaporation. As the small-molecule donor we use an oligothiophene derivative with butyl side chains (DCV6T-Bu) and the commonly used acceptor PCBM. The solution-processed DCV6T-Bu:PCBM bulk heterojunction cells are compared with a corresponding vacuum-deposited DCV6T-Bu:C60 reference cell.