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Synthesis of small-bandgap semiconducting oligomers and polymers shows efficient donor-acceptor interactions, indicating potential for advanced applications.
Small-bandgap semiconducting oligomers and polymers composed of quinoidal naphtho[1,2-b:5,6-b']dipyrrol-2,7-dione acceptor units and oligothiophene donor units were synthesized. Comparison with a phenyl-substituted reference showed that flanking thiophene units adjacent to the highly π-extended quinoidal core are crucial for efficient donor–acceptor interactions, leading to near-infrared absorption, small bandgaps down to 0.97 eV, and ambipolar carrier transport.
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Kurita et al. (2026) studied this question.
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