Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 34: Organic thin films II: Interface spectroscopy

DS 34.10: Talk

Thursday, March 29, 2012, 17:15–17:30, H 2032

Near-field Optical Imaging of Phase Separations in Organic Bulk Heterojunction Solar-cell Blends — •Dai Zhang, Xiao Wang, and Alfred Meixner — IPTC, Uni Tübingen, Auf der Morgenstelle 15,Tübingen, Germany

Semiconductor Polymers and fullerenes are widely employed in organic solar cell as electronic donors and acceptors. To achieve high performance of the solar cell, the formation of bulk heterojunction (BHJ) morphology in the polymer and fullerenes blends at nm scale is critical [1].

We have recently demonstrated high resolution near-field spectroscopic mappings of organic semiconductor thin film and polymer:fullerene blend films [2-4]. From the simultaneously recorded morphology and spectroscopic information, the interplay among the blend film BHJ morphology, the local donor and acceptor distributions, and their photoluminescence (PL) quenching were discussed. The PL and Raman signals of the donor and acceptor have been probed at optical resolution of approximately 15 nm. In addition, the local degradation behaviours of the semiconductor donor molecule and the acceptor molecule were investigated.

[1] J. Peet, A. J. Heeger, G. C. Bazan, Acc. Chem. Res., 42, 1700 (2009). [2] X. Wang, D. Zhang, K. Braun, H-J. Egelhaaf, C. J. Brabec, A. J. Meixner, Adv. Func. Mater. 20, 492 (2010). [3] D. Zhang, U. Heinemeyer, C. Stanciu, et al, Phys. Rev. Lett., 104, 056601 (2010). [4] X. Wang, H. Azimi, M. Morana, H.-J. Egelhaaf, A. J. Meixner, D. Zhang, Small, 7, 2793 (2011).