Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Organic Photovoltaics I

HL 46.11: Talk

Wednesday, March 16, 2011, 13:00–13:15, FOE Anorg

Charge Transport and Recombination Dynamics in Oxygen Exposed P3HT:PCBM Bulk Heterojunction Solar Cells — •Alexander Foertig¹, Andreas Baumann¹, Julia Schafferhans¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, Am Hubland, D-97074 Würzburg — ²Bavarian Centre for Applied Energy Research (ZAE Bayern e.V.), Am Hubland, D-97074 Würzburg, Germany

The effect of synthetic air exposure on the charge transport and recombination dynamics in poly(3-hexyl thiophene)(P3HT):[6,6]-phenyl-C₆₁ butyric acid methyl ester (PCBM) bulk heterojunction solar cells was studied using the complementary measurement techniques of (photo-generated) charge carrier extraction by linearly increasing voltage (photo-CELIV) and transient photovoltage (TPV) and transient photocurrent (TPC). An additional extraction peak appeared in the photo-CELIV transient at larger extraction fields, which is assigned to a field dependent release of previously trapped charge carriers. The complementary techniques consistently revealed an increased charge carrier density and reduced recombination with exposure time to oxygen which we attribute to delayed release from oxygen induced traps and therefore reduced recombination.