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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)

CPP 6.18: Poster

Montag, 26. März 2012, 17:30–19:30, Poster A

Electronic trap states in organic polymer-fullerene solar cells — •Julia Rauh¹, Stefan Neugebauer¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, D-97074 Würzburg — ²ZAE Bayern, D-97074 Würzburg

Trap states can have a significant influence on the performance of organic solar cells, as they lower the mobility, disturb the internal field distribution and affect the recombination dynamics. We investigated the trap states in the polymer P3HT as well as in fullerene derivatives commonly used as electron acceptors in organic bulk-heterojunction solar cells, namely PC₆₁BM, PC₇₁BM and bisPC₆₁BM, by thermally stimulated current measurements. Hereby, broad trap distributions were revealed for all investigated materials. In addition to the pure materials also polymer-fullerene blends were studied, revealing even deeper trap states, which were not detected in the single materials, with the amount of these deeper traps depending on the preparation conditions of the solar cells. The investigations are complemented by current-based deep level transient spectroscopy yielding additional information about the emission rates of the traps, which is of fundamental importance to describe charge carrier dynamics, e.g. in transient experiments