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The Effect of ?-Branched Side Chains on the Structural and Opto-Electronic Properties of Poly(Diketopyrrolopyrrole-alt-Terthiophene).

ABSTRACT: Introducing solubilizing ?-branched alkyl chains on a poly(diketopyrrolopyrrole-alt-terthiophene) results in a dramatic change of the structural, optical, and electronic properties compared to the isomeric polymer carrying ?-branched alkyl side chains. When branched at the ?-position the alkyl substituent creates a steric hindrance that reduces the tendency of the polymer to ?-? stack and endows the material with a much higher solubility in common organic solvents. The wider ?-? stacking and reduced tendency to crystallize, evidenced from grazing-incidence wide-angle X-ray scattering, result in a wider optical band gap in the solid state. In solar cells with a fullerene acceptor, the ?-branched isomer affords a higher open-circuit voltage, but an overall lower power conversion efficiency as a result of a too well-mixed nanomorphology. Due its reduced ?-? stacking, the ?-branched isomer fluoresces and affords near-infrared light-emitting diodes emitting at 820?nm.

SUBMITTER: Saes BWH 

PROVIDER: S-EPMC7702133 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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The Effect of α-Branched Side Chains on the Structural and Opto-Electronic Properties of Poly(Diketopyrrolopyrrole-alt-Terthiophene).

Saes Bart W H BWH   Wienk Martijn M MM   Janssen René A J RAJ  

Chemistry (Weinheim an der Bergstrasse, Germany) 20200929 62

Introducing solubilizing α-branched alkyl chains on a poly(diketopyrrolopyrrole-alt-terthiophene) results in a dramatic change of the structural, optical, and electronic properties compared to the isomeric polymer carrying β-branched alkyl side chains. When branched at the α-position the alkyl substituent creates a steric hindrance that reduces the tendency of the polymer to π-π stack and endows the material with a much higher solubility in common organic solvents. The wider π-π stacking and red  ...[more]

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