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Minimizing Polymer Band Gap via Donor-Acceptor Frameworks: Poly(dithieno[3,2-b:2 ‘,3 ‘-d]pyrrole-alt-thieno[3,4-b]pyrazine)s as Illustrative Examples of Challenges and Misconceptions
Donor-acceptor (D-A) frameworks have been produced via the copolymerization of the strong donor dithieno[3,2-b:2 ‘,3 ‘-d]pyrrole (DTP) with ambipolar thieno[3,4-b]pyrazine (TP) units to generate soluble, processible materials with band gaps as low as 0.8 eV. Optical and electronic characterization of the DTP-TP copolymers illustrate common misconceptions in the relative contributions of the comonomers to the D-A framework, as well as highlighting the challenges of minimizing band gap while also retaining desirable frontier orbital energies for application to technological devices.
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