Development of a new diindenopyrazine–benzotriazole copolymer for multifunctional application in organic field-effect transistors, polymer solar cells and light-emitting diodes

A new donor–acceptor (D−A) copolymer (PIPY–DTBTA) containing 6,12-dihydro-diindeno[1,2-b;1′,2′-e]pyrazine donor and benzotriazole acceptor was synthesized and characterized for multifunctional applications in organic field-effect transistors (OFETs), polymer solar cells (PSCs) and polymer light-emitting diodes (PLEDs). The polymer exhibits high molecular weights, excellent film-forming ability, a deep HOMO energy level, and good solution processability. Solution-processed thin film OFETs based on this polymer revealed good p-type characteristic with a high hole mobility up to 0.0521 cm2 V−1 s−1. Bulk-heterojunction PSCs comprising this polymer and PC61BM gave a power conversion efficiency (PCE) of 0.77%. The single-layer PLEDs based on PIPY–DTBTA emitted a yellow–red light with a maximum brightness of 385 cd m−2 at the turn-on voltage of 6 V.

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► A new D–A polymer PIPY–DTBTA was synthesized for multifunctional organic electronics.
► The polymer exhibits high molecular weight, excellent film-forming ability and a deep HOMO energy level.
► The OTFT devices exhibited impressive performance with a hole mobility up to 0.0521 cm2 V−1 s−1.
► The preliminary performance of PSCs and PLEDs based on PIPY–DTBTA were also investigated.