Redox-induced asymmetric electrical characteristics of ferrocene- alkanethiolate molecular devices on rigid and flexible substrates

Hyunhak Jeong, Dongku Kim, Gunuk Wang, Sungjun Park, Hanki Lee, Kyungjune Cho, Wang Taek Hwang, Myung Han Yoon, Yun Hee Jang, Hyunwook Song, Dong Xiang, Takhee Lee

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Abstract

The electrical properties of ferrocene-alkanethiolate self-assembled monolayers (SAMs) on a high yield solid-state device structure are investigated. The devices are fabricated using a conductive polymer interlayer between the top electrode and the SAM on both silicon-based rigid substrates and plastic-based flexible substrates. Asymmetric electrical transport characteristics that originate from the ferrocene moieties are observed. In particular, a distinctive temperature dependence of the current (i.e., a decrease in current density as temperature increases) at a large reverse bias, which is associated with the redox reaction of ferrocene groups in the molecular junction, is found. It is further demonstrated that the molecular devices can function on flexible substrates under various mechanical stress configurations with consistent electrical characteristics. This study enhances the understanding of asymmetric molecules and may lead to the development of functional molecular electronic devices on both rigid and flexible substrates. The electrical properties of ferrocene-alkanethiolate molecular devices on both rigid and flexible substrates are studied. A distinctive temperature dependence of the current (i.e., a decrease in current as temperature increases) upon an applied bias polarity, which is associated with the redox of ferrocene groups in the junctions, is observed. The flexible molecular devices function consistently under various mechanical stress configurations.

Original languageEnglish
Pages (from-to)2472-2480
Number of pages9
JournalAdvanced Functional Materials
Volume24
Issue number17
DOIs
Publication statusPublished - 2014 May 2
Externally publishedYes

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Keywords

  • ferrocene
  • flexible electronic devices
  • molecular electronics
  • redox phenomenon

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Jeong, H., Kim, D., Wang, G., Park, S., Lee, H., Cho, K., Hwang, W. T., Yoon, M. H., Jang, Y. H., Song, H., Xiang, D., & Lee, T. (2014). Redox-induced asymmetric electrical characteristics of ferrocene- alkanethiolate molecular devices on rigid and flexible substrates. Advanced Functional Materials, 24(17), 2472-2480. https://doi.org/10.1002/adfm.201303591