Electron and Hole Contributions to the Terahertz Photoconductivity of a Conjugated Polymer:Fullerene Blend Identified
Artikel i vetenskaplig tidskrift, 2012
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.
spectroscopy
mobility
carrier dynamics
polymers
chains
alternating polyfluorene copolymers
time
geminate charge recombination
heterojunction solar-cells
transport
Författare
C. S. Ponseca
Lunds universitet
H. Nemec
Czech Academy of Sciences
N. Vukmirovic
Univerzitet u Beogradu
Sandra Fusco
Chalmers, Kemi- och bioteknik, Industriell Bioteknik
Ergang Wang
Chalmers, Kemi- och bioteknik, Polymerteknologi
Mats Andersson
Chalmers, Kemi- och bioteknik, Polymerteknologi
P. Chabera
Lunds universitet
A. Yartsev
Lunds universitet
V. Sundstrom
Lunds universitet
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
Vol. 3 17 2442-2446Ämneskategorier
Kemi
DOI
10.1021/jz301013u