Role of redox centre in charge transport investigated by novel self-assembled conjugated polymer molecular junctions

Zongrui Wang, Huanli Dong (), Tao Li (), Rune Hviid, Ye Zou, Zhongming Wei, Xiaolong Fu, Erjing Wang, Yonggang Zhen, Kasper Nørgaard (), Bo W. Laursen and Wenping Hu ()
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Zongrui Wang: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Huanli Dong: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Tao Li: Nano-Science Center, University of Copenhagen
Rune Hviid: Nano-Science Center, University of Copenhagen
Ye Zou: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Zhongming Wei: Nano-Science Center, University of Copenhagen
Xiaolong Fu: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Erjing Wang: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Yonggang Zhen: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences
Kasper Nørgaard: Nano-Science Center, University of Copenhagen
Bo W. Laursen: Nano-Science Center, University of Copenhagen
Wenping Hu: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Molecular electronics describes a field that seeks to implement electronic components made of molecular building blocks. To date, few studies have used conjugated polymers in molecular junctions despite the fact that they potentially transport charge more efficiently than the extensively investigated small-molecular systems. Here we report a novel type of molecular tunnelling junction exploring the use of conjugated polymers, which are self-assembled into ultrathin films in a distinguishable ‘planar’ manner from the traditional vertically oriented small-molecule monolayers. Electrical measurements on the junctions reveal molecular-specific characteristics of the polymeric molecules in comparison with less conjugated small molecules. More significantly, we decorate redox-active functionality into polymeric backbones, demonstrating a key role of redox centre in the modulation of charge transport behaviour via energy level engineering and external stimuli, and implying the potential of employing tailor-made polymeric components as alternatives to small molecules for future molecular-scale electronics.

Date: 2015
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DOI: 10.1038/ncomms8478

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