Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.17: Poster

Wednesday, March 13, 2013, 16:00–20:00, Poster A

Loss mechanisms in organic bulk heterojunction solar cells investigated by differential photocurrent density measurements — •Philipp Pelchmann¹, Simon Hein¹, Andreas Zusan¹, Vladimir Dyakonov^1,2, and Carsten Deibel¹ — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²Bavarian Centre for Applied Energy Research (ZAE Bayern e.V.), D-97074 Würzburg

Organic solar cells are interesting for contributing to the solution of the growing demand for renewable energy sources. One of the main problems is their lower efficiency compared to their inorganic counterparts. For its optimization, a fundamental understanding of the loss mechanisms, i.e. geminate and non-geminate recombination, is crucial. The non-geminate recombination, a function of light intensity under short-circuit conditions, can be investigated by differential photocurrent (DPC) measurements [1]. Therefor, the electrical response of a solar cell to a superposition of a continuous background light and a modulated low intensity light is determined. We measured the DPC signal for bulk heterojunction solar cells made from poly(3-hexylthiophene) (P3HT) blend with [6,6]-phenyl C61-butyric acid methyl ester (PCBM) with various active layer thicknesses. The results are discussed with regard to non-geminate recombination of free and trapped charge carriers.

[1] L. J. A. Koster et al., Adv. Mater., 23, 1670 (2011)