Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1590
Title: Tuning the dimensions of C-60-based needlelike crystals in blended thin films
Authors: SWINNEN, Ann 
HAELDERMANS, Ilse 
VAN DE VEN, Martin 
D'HAEN, Jan 
VANHOYLAND, Geert 
ARESU, Stefano 
D'OLIESLAEGER, Marc 
MANCA, Jean 
Issue Date: 2006
Publisher: Wiley
Source: ADVANCED FUNCTIONAL MATERIALS, 16(6). p. 760-765
Abstract: A new ordered structure of the C60 derivative PCBM ([6-6]-phenyl C61-butyric acid methyl ester) is obtained in thin films based on the blend PCBM:regioregular P3HT (poly(3-hexylthiophene)). Rapid formation of needlelike crystalline PCBM structures of a few micrometers up to 100 m in size is demonstrated by submitting the blended thin films to an appropriate thermal treatment. These structures can grow out to a 2D network of PCBM needles and, in specific cases, to spectacular PCBM fans. Key parameters to tune the dimensions and spatial distribution of the PCBM needles are blend ratio and annealing conditions. The as-obtained blended films and crystals are probed using atomic force microscopy, transmission electron microscopy, selected area electron diffraction, optical microscopy, and confocal fluorescence microscopy. Based on the analytical results, the growth mechanism of the PCBM structures within the film is described in terms of diffusion of PCBM towards the PCBM crystals, leaving highly crystalline P3HT behind in the surrounding matrix.
Keywords: Fullerenes • Nanostructures, organic • Polymer blends • Solar cells, heterojunction
Document URI: http://hdl.handle.net/1942/1590
ISSN: 1616-301X
e-ISSN: 1616-3028
DOI: 10.1002/adfm.200500812
ISI #: 000236812400004
Category: A1
Type: Journal Contribution
Validations: ecoom 2007
Appears in Collections:Research publications

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