Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster III

HL 90.24: Poster

Thursday, March 10, 2016, 16:00–19:00, Poster A

Accessing charge transfer dynamics in Merocyanine:PCBM blends using NIR-VIS transient absorption spectroscopy — •Kestutis Budzinauskas¹, Lena Wysocki¹, Dirk Hertel², Klaus Meerholz², and Paul H.M. van Loosdrecht¹ — ¹II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77 50937 Köln — ²Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln

Merocyanine based dyes are good model materials to investigate charge generation mechanisms in donor:acceptor blend systems. The power conversion efficiency of organic solar cells is a complex parameter, which usually strongly depends on microscopic processes involving for instance interfacial charge transfer states and the formation of long lived triplet states. Fundamental understanding of these effects is critical in order to design new high conversion efficiency solar cells. Here, we study these processes on their intrinsic timescale using time resolved VIS-NIR spectroscopy methods. We focus on the charge formation dynamics in solution processed merocyanine:PCBM blends as well as in merocyanine single crystals and extract quantitative information on the charge transfer dynamics between different excited species.