Nanostructure of self-assembled rod-coil block copolymer films for photovoltaic applications
BROCHON, Cyril
Laboratoire d'Ingenierie des Polymères pour les Hautes Technologies
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
Laboratoire d'Ingenierie des Polymères pour les Hautes Technologies
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
HADZIIOANNOU, Georges
Laboratoire d'Ingenierie des Polymères pour les Hautes Technologies
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
< Reduce
Laboratoire d'Ingenierie des Polymères pour les Hautes Technologies
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
Language
en
Article de revue
This item was published in
Thin Solid Films. 2006, vol. 511-512, p. 219-223
Elsevier
English 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 ...Read more >
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.Read less <
English Keywords
transmission electron microscopy
self-assembled nanostructure
atomic force microscopy
rod-coil block copolymer
organic solar cell
Origin
Hal imported