Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.5: Poster
Mittwoch, 27. Februar 2008, 16:30–19:00, Poster D
Impedance spectroscopy on polymer solar cells — •Roland Rösch1, Ingo Hörselmann2, Andrei Herasimovic2, Susanne Scheinert2, Gerhard Gobsch1, and Harald Hoppe1 — 1Institute of Physics, Ilmenau University of Technology, Weimarer Straße 32, 98693 Ilmenau, Germany — 2Institute of Solid State Electronics, Ilmenau University of Technology, Gustav-Kirchhoff-Str. 1, 98693 Ilmenau, Germany
Impedance spectroscopy is a powerful tool to investigate internal electrical properties of an electronic device. We use this non-invasive technique to study polymer solar cells based on P3HT:PCBM blends and measure the admittance in dependence on the frequency of the applied voltage and fit the results with an equivalent circuit (EC). The elements of the EC reflect the internal electrical properties as contact behaviour, dielectric constants, depletion layers or charge transport. We varied the hole- and electron extracting contacts by modification layers or different metals. The different interlayers show an influence on charge transport and contact behaviour, which results in different device properties.