High Performance Nanocrystals of a Donor-Acceptor Conjugated Polymer

摘要

Highly crystalline, well-defined nanowires of a donor—acceptor (D—A) conjugated polymer based on bithiazole-thiazolothiazole (PTz) were successfully prepared by a facile solution self-assembly method, In PTz nanowires, polymer chains align along the long axis of the nanowires forming lamellar structures with close π-stacking perpendicular to the long axis of the nanowires. The nanowires possess a single crystal structure with orthorhombic crystal unit cell in which the lattice parameters are a fa 21.05 A, b fa 6.94 A, and c ≈ 4.64 A. The intrinsic charge transport property of PTz was characterized by using its single crystal nanowires in field-effect transistors with a mobility up to 0.46 cm~2 V~(-1) s~(-1). As an example of PTz single crystal nanowires in optoelectronic application, phototransistors of PTz nanowires exhibited a photoresponsivity up to 2531 A W~(-1) and a photosensitivity up to 1.7 × 10~4.