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

摘要

A new donor-acceptor (D-A) copolymer (PIPY-DTBTA) containing 6,12-dihydro-diinde-no[l,2-b;l',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 cm~2 V~(-1) s~(-1). Bulk-hetero-junction PSCs comprising this polymer and PC_(61)BM 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.