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Preparation of non-fullerene acceptors with a multi-asymmetric configuration in a one-pot reaction for organic solar cells
Ist Teil von
Journal of materials chemistry. C, Materials for optical and electronic devices, 2020-12, Vol.8 (48), p.17229-17236
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Asymmetric molecular configuration shows great potential in the design of non-fullerene acceptors (NFAs) for organic solar cells (OSCs). However, NFAs with multi-asymmetric factors are seldom explored and the structure-property relationship between different asymmetric isomers is unrevealed. Herein, two NFAs
2FIFIC
and
ICIF2F
were rationally designed by simultaneously introducing an asymmetric bridge and a terminal group into the A
1
-D-π-A
2
configuration. These two NFAs were synthesized in a one-pot reaction and separated facilely using silica gel column chromatography. Although
2FIFIC
and
ICIF2F
have almost identical absorption profiles and similar energy levels, the diversity of asymmetry endows these two molecules with varied miscibility blending with the donor polymer
PM6
, leading to different morphology in blend films. The relatively low miscibility between
2FIFIC
and
PM6
enables their blend film to form a nanoscale fiber-like domain and stronger phase separation. This favorable morphology enhances the electron mobility and restrains charge recombination in
PM6
:
2FIFIC
devices, thus delivering a higher short circuit current density (
J
sc
), eventually providing a better PCE of 11.34% than that of
ICIF2F
based devices (9.60%). This work demonstrates that introducing multi-asymmetric factors into NFAs is a fruitful way of advancing OSCs, and the results revealed here are helpful in the design of new asymmetric NFAs.
Non-fullerene acceptors with a multi-asymmetric configuration are prepared in a one-pot reaction and show distinct properties.