Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Organic Photovoltaics II
CPP 33.3: Talk
Thursday, March 26, 2009, 14:30–14:45, ZEU 222
Nanoscale Near-field Spectroscopic Investigation of the Interplay between Local Film Morphology and the P3HT/PCBM Organic Solar Cell Efficiency — •Dai Zhang1, Xiao Wang1, Kai Braun1, Hans-Joachim Egelhaaf2, and Alfred J. Meixner1 — 1Institute of Physical and Theoretical Chemistry, University of Tuebingen, Germany — 2Christian-Doppler-Lab for Surface Optical Methods, Johannes-Kepler-University and Konarka GmbH, Linz, Austria
The interplay between the local film morphology and the organic solar cell efficiency is systematically investigated by apertureless near-field scanning optical microscopy (SNOM). A home-built parabolic mirror assisted SNOM is used to collect both the topography and optical (Raman and photoluminescence (PL)) information from the Poly (3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) blend film. Molecular domains composed of either PCBM or P3HT at nanometer scale are successfully determined by their corresponding Raman fingerprint information and PL information. The regioregularity of P3HT polymer influenced by the clustering of PCBM during thermal annealing is compared considering the FWHM broadening of the C=C vibration Raman peak. The influences of the local film morphology and the local distribution of P3HT/PCBM on the solar cell efficiency are discussed based on the different PL quenching levels induced by the exciton dissociation and electron transfer at P3HT/PCBM interfaces.