Electronic properties associated with conformational changes in azobenzene-derivative molecular junctions

Yonghun Kim, Gunuk Wang, Minhyeok Choe, Juhwan Kim, Sangchul Lee, Sungjun Park, Dong Yu Kim, Byoung Hun Lee, Takhee Lee

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


The electronic properties of azobenzene-derivative ([4-(phenylazo)phenoxy] hexane-1-thiol) molecular junctions were studied in terms of their molecular configurations with vertical device structure as solid-state device platform. This molecule has two distinct molecular configurations (trans- and cis-isomer) depending on the wavelength of irradiating light, which converts from more thermodynamically stable trans-isomer to cis-isomer under UV exposure (∼365 nm) and reversible photoisomerization of cis-isomer to trans-isomer under visible light (400-500 nm). The two states showed that the conductance of cis-isomer (compact form) was higher than that of trans-isomer (extended form). From the temperature-variable electrical characterization, the main charge conduction mechanism for the two isomers was found to be tunneling. And, from the transition voltage spectroscopy analysis and ultraviolet photoelectron spectroscopy measurement, the origin of such result can be explained by reduction of molecular tunneling distance between two isomers.

Original languageEnglish
Pages (from-to)2144-2150
Number of pages7
JournalOrganic Electronics
Issue number12
Publication statusPublished - 2011 Dec
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Laboratory program; a Korean National Core Research Centre grant ; the World Class University program of the Korean Ministry of Education, Science, and Technology; the Program for Integrated Molecular Systems at GIST. We thank Ja Min Koo and Yun Hee Jang for discussions throughout this study.


  • Azobenzene
  • Molecular configuration
  • Molecular electronic devices
  • Photoisomerization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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