Dresden 2014 – scientific programme

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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.