Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.42: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Negative Capacitance for various electrode materials in organic solar cells — •Roland Rösch¹, Almantas Pivrikas², Niyazi Serdar Sariciftci², and Harald Hoppe¹ — ¹Institute of Physics, TU Ilmenau, 98693 Ilmenau, Germany — ²LIOS, Johannes Kepler University Linz, 4040 Linz, Austria

Electrical behaviour of bulk heterojunction polymer solar cells is strongly influenced by their contacts. Charge carrier injection/extraction at contact-active layer interface depends on type of contact. In the literature different models - Schottky-contact, thermionic injection and injection via hopping processes - for the cathode contact are discussed. We use different contact materials and investigate the resulting capacitance via impedance spectroscopy, a non-invasive technique for electrical analysis. We observe a dependence of Negative Capacitance on contact type.