Incorporation of benzothiadiazole into the backbone of 1,2,5,6-naphthalenediimide based copolymers, enabling much improved film crystallinity and charge carrier mobility

Literature Information

Publication Date 2015-11-13
DOI 10.1039/C5PY01709B
Impact Factor 5.582
Authors

Zheng Zhao, Zhongli Wang, Congwu Ge, Xu Zhang, Xiaodi Yang, Xike Gao


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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 cm2 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 (Voc) 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.

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