Electron and Hole Contributions to the Terahertz Photoconductivity of a Conjugated Polymer:Fullerene Blend Identified
Journal article, 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
Author
C. S. Ponseca
Lund University
H. Nemec
Czech Academy of Sciences
N. Vukmirovic
University of Belgrade
Sandra Fusco
Chalmers, Chemical and Biological Engineering, Industrial biotechnology
Ergang Wang
Chalmers, Chemical and Biological Engineering, Polymer Technology
Mats Andersson
Chalmers, Chemical and Biological Engineering, Polymer Technology
P. Chabera
Lund University
A. Yartsev
Lund University
V. Sundstrom
Lund University
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
Vol. 3 17 2442-2446Subject Categories
Chemical Sciences
DOI
10.1021/jz301013u