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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
Author(s) -
Evenson Sean J.,
Mulholland Michael E.,
Anderson Trent E.,
Rasmussen Seth C.
Publication year - 2020
Publication title -
asian journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.846
H-Index - 44
eISSN - 2193-5815
pISSN - 2193-5807
DOI - 10.1002/ajoc.202000126
Subject(s) - pyrazine , ambipolar diffusion , chemistry , pyrrole , acceptor , copolymer , band gap , characterization (materials science) , polymer chemistry , polymer , combinatorial chemistry , photochemistry , nanotechnology , stereochemistry , optoelectronics , organic chemistry , electron , materials science , condensed matter physics , physics , quantum mechanics
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.