Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 93: Photovoltaics (HL, jointly with CPP, O)

HL 93.5: Talk

Friday, March 15, 2013, 10:15–10:30, H2

High-resolution Spectroscopic Mapping of Polymer Fullerene Blend Films for Organic Solar-Cell Applications — Xiao Wang, Kai Braun, Alfred J. Meixner, and •Dai Zhang — Institute of Physical and Theoretical Chemistry, Uni. Tübingen, Tübingen

Polymers and fullerenes are widely employed in the field of organic solar cells as the electronic donors and acceptors. The morphology and the photo-physical properties of the polymer and fullerenes blends at nanometer scale are critical for achieving a high performance of the solar cells. Employing a home-built parabolic mirror assisted apertureless near-field optical (Raman and photoluminescence) microscope, we demonstrated high resolution near-field spectroscopic mappings of the polymer:fullerene blend films. Our investigation focused on the additive effect for a C-PCPDTBT:PCBM blend film. From the simultaneously recorded morphology and spectroscopic information, the interplay among the blend film morphology, the local donor and acceptor molecular distributions, and the photoluminescence quenching efficiency were discussed. The PL and Raman signals of the electron donor and acceptor have been probed at an optical resolution of approximately 10 nm which allow the direct identification of the chemical nature of the different domains. Moreover, we were able to reveal and quantify the local quenching, which is related to the electron transfer from donor to acceptor.