Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 25: Organic Electronics and Photovoltaics CPP-III (jointly with CPP, HL, and O)

DS 25.2: Talk

Tuesday, March 15, 2011, 14:15–14:30, ZEU 222

Near-field spectroscopic mapping of the nanoscale phase separation of low band-gap polymer:fullerene blend film — •xiao wang¹, hamed azimi², hans-georg mack¹, mauro morana², hans-joachim egelhaaf³, alfred j. meixner¹, and dai zhang¹ — ¹Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 18, University of Tübingen, Germany — ²Konarka Austria F&E GmbH, Linz, Austria — ³Konarka Technologies GmbH, Nürnberg, Germany

We present the study of the influences of the additive 1,8-octanedithiol (ODT) on the nanometer scale morphology and local photophysics properties of low band-gap polymer blends, PCPDTBT and PCBM. Near-Field spectroscopic mapping provides the possibility to obtain simultaneously morphology and spectroscopic (photoluminescence and Raman) information correlated with high spatial resolution.[1] We observe the phase separations of the PCPDTBT:PCBM blend film induced by ODT by the dramatically increased PL emission from PCPDTBT that was originally largely quenched, by the fluctuations of spectral features at different locations of the sample surface, by the fibril-shaped topographic features evolve to spherical bumps. The correlations between the local photo physics properties and the morphology of the blend film with/without ODT at both the micrometer and nanometer scales were revealed by the confocal and high-resolution near-field spectroscopic mapping technique. 1.Wang, X.; Zhang, D.; Braun, K.; Egelhaaf, H. J.; Brabec, C. J.; Meixner, A. J. Adv. Funct. Mater. 2010, 20, (3), 492-499.