Electron and hole contributions to the terahertz photoconductivityof a conjugated polymer:Fullerene blend identified

0381956 - FZÚ 2013 RIV US eng J - Journal Article
Ponseca, C.S. - Němec, Hynek - Vukmirović, N. - Fusco, S. - Wang, E. - Andersson, M.R. - Chábera, P. - Yartsev, A. - Sundström, V.
Electron and hole contributions to the terahertz photoconductivityof a conjugated polymer:Fullerene blend identified.
Journal of Physical Chemistry Letters. Roč. 3, č. 17 (2012), s. 2442-2446. ISSN 1948-7185
Grant - others:AV ČR(CZ) M100101218
Institutional research plan: CEZ:AV0Z10100520
Keywords : charge transport in organic semiconductors * time-resolved terahertz spectroscopy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 6.585, year: 2012

Time-resolved terahertz spectroscopy was employed for the investigation of charge-transport dynamics in benzothiadiazolo-dithiophene polyfluorene ([2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3-benzothiadiazole)]) (APFO-3) polymers with various chain lengths and in its monomer form, all blended with an electron acceptor ([6,6]-phenyl-C61-butyric acid methyl ester, PCBM). Upon photoexcitation, charged polaron pairs are created, negative charges are transferred to fullerenes, while positive polarons remain on polymers/monomers. Vastly different hole mobility in polymer and monomer blends allows us to distinguish the hole and electron contributions to the carrier mobility.
Permanent Link: http://hdl.handle.net/11104/0212312