Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Electrical, Dielectrical and Optical Properties of Thin Films I
CPP 2.3: Talk
Monday, March 12, 2018, 10:00–10:15, C 230
Advanced synthesis of transparent and conductive poly(3,4-ethylenedioxy thiophene) films via vapor-based routes — •Florian Meierhofer1,2, Laurie Neumann1,3, Wolfgang Kowalsky1,3, Hans-Hermann Johannes1,3, and Tobias Voss1,2 — 1Laboratory for Emerging Nanometrology (LENA), TU Braunschweig, Germany — 2Institute of Semiconductor Technology (IHT), TU Braunschweig, Germany — 3Institute of High-Frequency Technology (IHF), TU Braunschweig, Germany
Conducting polymers (CP) combine the electrical properties of semiconductors and metals with mechanical flexibility and stretch of insulating polymers, and therefore offer a huge potential for light emitting diodes (LEDs) and photovoltaics (PV). During the past two decades, PEDOT:PSS has become one of the most attractive CPs and is often applied in spin-coated 2D-layers. The coating of more complicated 3D-surfaces, e.g. nanowires/-trenches, however, typically results in an incomplete surface coverage. This issue can be overcome by applying the polymerization directly from the vapor phase. In this work, we use vapor-phase polymerization (VPP) and oxidative chemical vapor deposition (oCVD) for the fabrication of layers of PEDOT and other thiophene derivatives. Aiming for high transparency and electrical conductivity, we systematically screen oxidizing agents and polymerization temperatures. First results for the vapor-synthesized PEDOT demonstrate a transparency of about 90% and 5 S/cm electrical conductivity, which is even superior to PEDOT:PSS as the commercial benchmark.