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

Heiser, T. and Adamopoulos, George and Brinkmann, M. and Giovanella, U. and Ould-Saad, S. and Brochon, C. and van de Wetering, K. I. and Hadziioannou, G. (2006) Nanostructure of self-assembled rod-coil block copolymer films for photovoltaic applications. Thin Solid Films, 511-51. pp. 219-223. ISSN 0040-6090

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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.

Item Type: Article
Journal or Publication Title: Thin Solid Films
Uncontrolled Keywords: Rod-coil block copolymer ; Organic solar cell ; Self-assembled nanostructure ; Atomic force microscopy ; Transmission electron microscopy
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 58568
Deposited By: ep_importer_pure
Deposited On: 29 Oct 2012 16:42
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58568

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