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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1949

Title: Dual crystallization behaviour of polythiophene/fullerene blends
Authors: SWINNEN, Ann
HAELDERMANS, Ilse
VANLAEKE, Peter
D'HAEN, Jan
Poortmans, J
D'OLIESLAEGER, Marc
MANCA, Jean
Issue Date: 2006
Publisher: EDP SCIENCES S A
Citation: EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS, 36(3). p. 251-256
Abstract: The nanoscale morphology of the active layer in bulk-heterojunction solar cells consisting of regioregular poly(3-hexylthiophene-2, 5-diyl) (P3HT) and methanofullerene([6-6]-phenyl C-61 butyric acid methyl ester) (PCBM) was extensively studied using Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD) and optical microscopy. Different weight ratios of P3HT: PCBM were investigated as a function of annealing temperature and time revealing the occurrence of crystallization of both components. Firstly, the as-prepared films can be described as a semi-crystalline blend. Secondly, it has been demonstrated that for a short annealing time (5 min) at lower annealing temperatures (75-115 degrees C) an increased crystallization of P3HT occurs. Thirdly, it has been observed that a prolonged annealing at the given temperature range or a short annealing at higher temperatures (= 120 degrees C) leads to the formation of a new ordered crystalline structure of PCBM. These new ordered structures, a few mu m up to 100 mu m in length, form a network of needle-like and even fan-shaped crystals. Key-parameters to "tune" this new ordered structure of PCBM are blend ratio and annealing conditions. The growth mechanism of these new PCBM-structures is described by means of diffusion.
Notes: Hasselt Univ, Mat Res Inst, B-3590 Diepenbeek, Belgium. IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium.Swinnen, A, Hasselt Univ, Mat Res Inst, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/1949
DOI: 10.1051/epjap:2006138
ISI #: 000243397900009
ISSN: 1286-0042
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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