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HL: Fachverband Halbleiterphysik

HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors

HL 72.23: Poster

Mittwoch, 28. März 2012, 16:00–19:00, Poster D

Transient resolved recombination measurements in organic bulk heterojunction solar cells — •Markus Gluecker¹, Alexander Foertig¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg, Germany — ²Bavarian Centre for Applied Energy Research (ZAE Bayern e.V.), Am Hubland, 97074 Würzburg, Germany

The understanding of the current–voltage behavior is a prerequisite for improving the solar cell performance. Transient photovoltage (TPV), transient photocurrent (TPC) and voltage dependent charge extraction (CE) measurements were applied to organic solar cells based on different polymer:fullerene blend systems. From the determined charge carrier decay mechanism under open circuit conditions and voltage dependent charge carrier densities n(V) the measured I/V response can be reconstructed. For material systems such as poly(3-hexyl thiophene)(P3HT):[6,6]-phenyl-C₆₁ butyric acid methyl ester (PCBM) characterized by a voltage independent charge generation, we verified that bimolecular recombination is sufficient to describe the I/V behaviour over the entire operational regime. We further address the temperature dependent applicability of this analysis.