Watching Paint Dry: The Impact of Diiodooctane on
the Kinetics of Aggregate Formation in Thin Films of Poly(3-hexylthiophene)
Version 2 2016-09-07, 13:20
Version 1 2016-08-23, 15:57
Posted on 2016-08-23 - 00:00
We have investigated
how the addition of 1,8-diiodooctane (DIO)
alters the formation of disordered and ordered phases in a film of
poly(3-hexyl-thiophene-2,5-diyl) (P3HT). By combining in situ time-resolved
absorption spectroscopy with 60 ms time resolution, optical and transmission
electron microscopy and spatially resolved photoluminescence spectroscopy,
we show that, in addition to the excitonic coupling, the film formation
process during spin-coating as well as the subsequent long-time film
drying process differ significantly when DIO is added to a solution
of P3HT. During spin-coating, the addition of DIO reduces the actual
time for transformation from disordered to ordered phase, even though
it increases the time until the disorder–order transition sets
in. In place of a solidification front, we observe an all-over solidification
throughout the entire film. The phase separation between nonaggregated
and aggregated phase increases when using DIO, with compositional
variation in the content of aggregated phase on a micrometer scale.
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Reichenberger, Markus; Baderschneider, Sebastian; Kroh, Daniel; Grauf, Steffen; Köhler, Jürgen; Hildner, Richard; et al. (2016). Watching Paint Dry: The Impact of Diiodooctane on
the Kinetics of Aggregate Formation in Thin Films of Poly(3-hexylthiophene). ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.6b01257
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AUTHORS (7)
MR
Markus Reichenberger
SB
Sebastian Baderschneider
DK
Daniel Kroh
SG
Steffen Grauf
JK
Jürgen Köhler
RH
Richard Hildner
AK
Anna Köhler