Since the 1960s, poly(benzobisimidazobenzophenathrolinedione) (BBL) has been the only n-type ladder-type conjugated polymer (LCP) that is utilized in thin film electronic devices. Its high electrochemical and thermal stabilities make it a promising candidate for organic electrochemical transistors (OECTs) and thermoelectrics (OTEs) applications. Here we report the synthesis and characterization of a new π-extended poly(benzimidazoanthradiisoquinolinedione) (BAL). The tetrachlorinated BAL (Cl4-BAL) is fully soluble in methanesulfonic acid (MSA) and can be spin-coated into good quality thin films, enabling the fabrication and characterization of OTEs. Doping of Cl4-BAL films using our in-house benzyl viologen radical cation (BV •+ ) n-dopant shows better electrical air-stability as compared to BBL due to its very low LUMO value (−4.83 eV), making it a promising material toward air-stable n-doped conducting polymers.
Ambipolar bulk heterojunction polymer thermoelectrics was demonstrated for the first time using the classic n-type poly(benzimidazobenzophenanthrolinedione) ladder polymer (BBL) and the new p-type 6H-pyrrolo[3,2-b:4,5-b′]bis[1,4]benzothiazine ladder polymer (PBBTL). The blend films...
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