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Electron and Hole Contributions to the Terahertz Photoconductivity of a Conjugated Polymer:Fullerene Blend Identified

C. S. Ponseca ; H. Nemec ; N. Vukmirovic ; Sandra Fusco (Institutionen för kemi- och bioteknik) ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; P. Chabera ; A. Yartsev ; V. Sundstrom
Journal of Physical Chemistry Letters (1948-7185). Vol. 3 (2012), 17, p. 2442-2446.
[Artikel, refereegranskad vetenskaplig]

Time-resolved terahertz spectroscopy was employed for the investigation of charge-transport dynamics in benzothiadiazolo-dithiophene polyfluorene ([2,7-(9,9-dioctylfluorene)-alt-S,S-(4',7'-di-2-thieny1-2',1',3'-benzoth iadiazole)]) (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 photo-excitation, 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.

Nyckelord: alternating polyfluorene copolymers, geminate charge recombination, heterojunction solar-cells, carrier dynamics, spectroscopy, time, transport, polymers, mobility, chains



Denna post skapades 2012-10-30. Senast ändrad 2016-07-05.
CPL Pubid: 165243

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik (2005-2014)
Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur