Non-symmetric Half-Fused B←N Coordinated Diketopyrrolopyrrole Building Block for n-type Semiconducting Polymers.

Abstract

The development of conjugated polymers with high semiconducting performance and high reliability is of great significance for flexible electronics. Herein, we develop a new type of electron-accepting building block; ie., non-symmetric half-fused B←N coordinated diketopyrrolopyrrole (DPP) (HBNDPP),for amorphous conjugated polymers towards flexible electronics. The rigid B←N fusion part of HBNDPP endows the resulting polymers with decent electron transport, while the non-symmetric structure of HBNDPP causes the polymer to exhibit multiple conformation isomers with flat torsional potential energies.Thus, it gets packed in anamorphous mannerin solid state, ensuring good resistance to bending strain. Combined with hardness and softness, the flexible OFET devices exhibit n-type charge properties with decent mobility, good bending resistance, and good ambient stability. The preliminary study makes this building block a potential candidate for future design of conjugated materials for flexible electronic devices.