New Approach for Large-Area Thermoelectric Junctions with a Liquid Eutectic Gallium-Indium Electrode

Sohyun Park, Hyo Jae Yoon

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


A challenge in organic thermoelectrics is to relate thermoelectric performance of devices to the chemical and electronic structures of organic components inside them on a molecular scale. To this end, a reliable and reproducible platform relevant to molecular-level thermoelectric measurements is essentially needed. This paper shows a new, efficient approach for thermoelectric characterization of a large area of molecular monolayers using liquid eutectic gallium-indium (EGaIn). A cone-shaped EGaIn microelectrode permits access to noninvasive, reversible top-contact formation onto organic surfaces in ambient conditions, high yields of working devices (up to 97%), and thus statistically sufficient thermoelectric data sets (∼6000 data per sample in a few hours). We here estimated thermopowers of EGaIn (3.4 ± 0.1 μV/K) and the Ga2O3 layer (3.4 ± 0.2 μV/K) on the EGaIn conical tip and successfully validated our platform with widely studied molecules, oligophenylenethiolates. Our approach will open the door to thermoelectric large-area molecular junctions.

Original languageEnglish
JournalNano Letters
Publication statusAccepted/In press - 2018 Jan 1


  • EGaIn
  • large-area junction thermopower
  • Molecular thermoelectrics
  • self-assembled monolayers
  • soft top-contact

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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