Nanostructure of self-assembled rod-coil block copolymer films for photovoltaic applications

Thomas Heiser 1 G. Adamopoulos 2 Martin Brinkmann 3 U. Giovanella 2 S. Ould-Saad 1 Cyril Brochon 2, 4 K. Van de Wetering 2 Georges Hadziioannou 2, 4
1 InESS - Institut d'Electronique du Solide et des Systèmes
2 Laboratoire d'Ingenierie des Polymères pour les Hautes Technologies
3 ICS - Institut Charles Sadron
4 TEAM 4 LCPO
Abstract : The nanostructures of a series of rod-coil block copolymers, designed for photovoltaic applications, are studied by atomic force microscopy and transmission electron microscopy. The copolymers are composed of a semiconducting poly-p-phenylenevinylene rod with (2'-ethyl)-hexyloxy side chains and a functionalized coil block of various length and flexibility. Both, as deposited and annealed block copolymer films were investigated. The results show that highly ordered structures are only obtained if the coil block is characterized by a glass transition temperature which is significantly lower than the melting temperature of the alkyl side chains. For this material a high molecular mobility and strong driving force for crystallization of the rigid block can be achieved simultaneously. For the smallest coil to rod length ratio, we found a lamellar morphology with perpendicularly oriented lamellae with respect to the substrate. Electron diffraction data show the presence of a periodical molecular arrangement with a characteristic distance of 0.94 nm that is attributed to the distance between conjugated chains separated by the layers of alkyl sidechains.
Keywords : transmission electron microscopy self-assembled nanostructure atomic force microscopy rod-coil block copolymer organic solar cell
Type de document :
Article dans une revue
Thin Solid Films, Elsevier, 2006, 511-512, pp.219-223. 〈10.1016/j.tsf.2005.12.134〉
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https://hal.archives-ouvertes.fr/hal-00402995
Contributeur : Dominique Richard <>
Soumis le : mercredi 8 juillet 2009 - 17:50:12
Dernière modification le : samedi 27 octobre 2018 - 01:28:11

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Thomas Heiser, G. Adamopoulos, Martin Brinkmann, U. Giovanella, S. Ould-Saad, et al.. Nanostructure of self-assembled rod-coil block copolymer films for photovoltaic applications. Thin Solid Films, Elsevier, 2006, 511-512, pp.219-223. 〈10.1016/j.tsf.2005.12.134〉. 〈hal-00402995〉

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