Dresden 2014 – wissenschaftliches Programm

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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 35.65: Poster

Mittwoch, 2. April 2014, 17:00–20:00, P1

Highly conductive vapor phase deposition of poly-3,4-ethylenedioxythiophene (PEDOT) as transparent electrode in organic devices — •Jakob Holfeld, Jan Ludwig Bormann, Lars Müller-Meskamp, and Karl Leo — Institut für Angewandte Photophysik - Technische Universität Dresden, Dresden, Deutschland

Highly conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is a promising alternative to the brittle and expensive indium tin oxide (ITO) as transparent electrode in organic solar cells. However, since PSS is highly acidic and hygroscopic, residual PSS can harm the devices after integration.

We investigate a PSS and water free deposition of PEDOT by introducing its monomer via vapor phase. This was carried out in different ways: In a process with iron-(III)-tosylate as pre-spin-coated oxidant, the addition of pyridine as base inhibitor or an amphiphilic block-copolymer as structure directing additive can lead to an dramatic improvement in conductivity (we achieved over 1100 S/cm) and makes PEDOT competitive to ITO. An all-gas-phase PEDOT layer growth with Fe(III)Cl as oxidant agent was also carried out, offering excellent possibilities on solvent sensitive and rough surfaces. Furthermore, planarization of silver nanowires by the use of vapor phase PEDOT, increasing their integrability into organic devices, was tested.