Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 5: Organic Photovoltaics III

SYOP 5.1: Talk

Friday, March 27, 2009, 10:30–10:45, ZEU 222

Characterization of electroactive polymers and block copolymers with potential application in organic solar cells — •Sabine Ludwigs — Freiburg Institute for Advanced Studies & Freiburg Materials Research Center, Stefan-Meier-Str. 21, 79104 Freiburg

Organic solar cells represent a new type of solar cells based on composites of an electron-donor (p-type) and an electron-acceptor (n-type) material. The low consumption of material and the application of efficient production techniques offer great potential for cost-efficient production of these solar cells.

In my talk I will show results on the electrochemical characterization of redox polymers bearing triarylamine as pendant electroactive units and on conjugated polymers, e.g. poly(para phenylene vinylenes). We use electrochemically-gated transistors to study the electronic properties of these p-type polymers, in particular the potential of doping and the intrinsic conductivity.

Block copolymers consisting of the above-mentioned polymers and neutral, sacrificial polylactides were further polymerized and characterized. Block copolymers are particularly interesting because they typically self assemble into ordered microdomain morphologies with length scales of about 5-50 nm. Upon degradation of the sacrificial block after structure formation polymer films with nanopores can be obtained. Ultimately these nanoporous polymer films shall be employed as templates for the deposition of semiconducting inorganic materials.