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 2442-2446

Ämneskategorier

Kemi

DOI

10.1021/jz301013u