Abstract
The position at which conjugated side chains were fluorinated, the meta- or ortho-position in phenyl side chains, was varied to investigate the positional effects of fluorination on the energy levels, crystalline ordering, and photovoltaic properties of the polymers. The fluorine in the ortho-position achieved a lower HOMO energy level than that in the meta-position, but reduced the chain rigidity.
Highlights
The position at which conjugated side chains were fluorinated, the meta- or ortho-position in phenyl side chains, was varied to investigate the positional effects of fluorination on the energy levels, crystalline ordering, and photovoltaic properties of the polymers
We examined the effects of fluorination in a conjugated side chain at various positions by synthesizing a new donor moiety with a fluorine atom substituted in place of a hydrogen atom at the ortho-position of alkoxy-phenyl (Ph-o-F) and evaluated with the fluorine substituted for hydrogen at the metaposition in alkoxy-phenyl (Ph-m-F)
ChemComm achieved a lower highest occupied molecular orbital (HOMO) energy level when the fluorine was in the ortho-position than when it was in the meta-position, whereas the substitution of fluorine at the ortho-position reduced the chain rigidity and caused inferior crystalline ordering
Summary
The position at which conjugated side chains were fluorinated, the meta- or ortho-position in phenyl side chains, was varied to investigate the positional effects of fluorination on the energy levels, crystalline ordering, and photovoltaic properties of the polymers. The fluorine in the ortho-position achieved a lower HOMO energy level than that in the meta-position, but reduced the chain rigidity.
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