Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole)

The dynamics of charge carrier generation in poly(spirobifluorene-co-benzothiadiazole) was investigated by electric field-induced fluorescence quenching and differential absorption measurements. Three different time domains of carrier generation have been identified: an ultrafast phase, a subnanosec...

Full description

Saved in:
Bibliographic Details
Published in:The Journal of chemical physics 2010-10, Vol.133 (16), p.164904-164904
Main Authors: Devizis, A, Serbenta, A, Peckus, D, Thiessen, A, Alle, R, Meerholz, K, Hertel, D, Gulbinas, V
Format: Article
Language:English
Subjects:
ABSORPTION
AROMATICS
CARRIER LIFETIME
CARRIERS
CHARGE CARRIERS
CHARGE EXCHANGE
CONDENSED AROMATICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
EFFICIENCY
ELECTRIC FIELDS
EMISSION
FLUORENE
FLUORESCENCE
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LIFETIME
LUMINESCENCE
ORGANIC COMPOUNDS
PHOTON EMISSION
POLYMERS
QUENCHING
SORPTION
SPECTROSCOPY
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The dynamics of charge carrier generation in poly(spirobifluorene-co-benzothiadiazole) was investigated by electric field-induced fluorescence quenching and differential absorption measurements. Three different time domains of carrier generation have been identified: an ultrafast phase, a subnanosecond phase, and an entire lifetime phase. The charge generation efficiencies during the first and second phases were found to be almost independent of temperature, being about 25% and 10%, respectively, at an applied electric field of 1.3×10(6) V/cm, while the generation efficiency during the third phase increases from 2% at 80 K to 10% at room temperature. The results of transient spectroscopy measurements and quantum chemical calculations suggest an intramolecular charge transfer for about 1 ps from the alkoxy-substituted fluorene side group to the benzothiadiazole subunit of the main chain. The formation and evolution of the resulting charge transfer states determine the way of charge carrier generation.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3493589