Incorporation of benzothiadiazole into the backbone of 1, 2, 5, 6-naphthalenediimide based copolymers, enabling much improved film crystallinity and charge carrier mobility. Issue 3 (20th November 2015)

• Record Type: Journal Article
• Authors: Zhao, Zheng; Wang, Zhongli; Ge, Congwu; Zhang, Xu; Yang, Xiaodi; Gao, Xike
• Is Part Of: Polymer chemistry. Volume 7:Issue 3(2016)
• Page Start: 573
• Page End: 579
• Publication Date: 2015-11-20
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c5py01709b
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : By incorporating benzothiadiazole units into the main chain of 1, 2, 5, 6-naphthalenediimide based copolymers, we report herein a new copolymer with much improved film crystallinity and charge carrier mobility. Abstract : By incorporating benzothiadiazole units into the main chain of 1, 2, 5, 6-naphthalenediimide (iso-NDI) and thiophene based copolymers, we report herein a new high performance donor–acceptor (D–A) polymer, P(iso-NDI-TBT), with much improved film crystallinity and charge carrier mobility. The optical, electrochemical, and charge transport properties as well as the photovoltaic performance were investigated. Bottom-gate bottom-contact organic field-effect transistors (OFETs) based on the thin films of P(iso-NDI-TBT) show a high hole mobility of up to 0.82 cm 2 V −1 s −1, which is a record value for the 1, 2, 5, 6-NDI based polymers. In addition, the photovoltaic performance of P(iso-NDI-TBT) was also studied, affording a power conversion efficiency (PCE) of 1.5% with a high open-circuit voltage ( V oc ) of 0.9 V. Our work provides important clues for designing high performance D–A polymeric semiconductors and also demonstrates that 1, 2, 5, 6-NDIs are promising building blocks for constructing new polymer semiconductors.