Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster: Organic Semiconductors

CPP 24.29: Poster

Wednesday, March 28, 2012, 11:00–13:00, Poster A

Charge transport and recombination dynamics in low-bandgap polymer:fullerene solar cells — •Andreas Zusan¹, Andreas Baumann², Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, D-97074 Würzburg — ²Bavarian Center for Applied Energy Research (ZAE Bayern), D-97074 Würzburg

In the class of low-bandgap conjugated polymers PCPDTBT blended with PC₇₀BM is a promising candidate on the route towards highly efficient organic photovoltaics. The substitution of the bridging carbon atom by silicon (Si-PCPDTBT) is known to cause the formation of separated donor and acceptor phases and an enhanced power conversion efficiency. In this context the transport and recombination dynamics in PCPDTBT:PC₇₀BM and Si-PCPDTBT:PC₇₀BM bulk heterojunction solar cells were studied by the use of charge extraction by linearly increasing voltage (CELIV) under working conditions. We found an enhanced density of photogenerated charges as well as an increased effective charge carrier lifetime for Si-PCPDTBT:PC₇₀BM. The results are explained by the changes in morphology and can be directly linked to the raised device performance bridging the gap between nanoscale and application.