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

Sohyun Park, Hyo Jae Yoon

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Gallium
Indium
eutectics
Eutectics
gallium
indium
Electrodes
electrodes
Liquids
liquids
platforms
Microelectrodes
Thermoelectric power
Electronic structure
Cones
Monolayers
cones
electronic structure
Molecules
molecules

Keywords

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

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

New Approach for Large-Area Thermoelectric Junctions with a Liquid Eutectic Gallium-Indium Electrode. / Park, Sohyun; Yoon, Hyo Jae.

In: Nano Letters, 01.01.2018.

Research output: Contribution to journalArticle

@article{a1e851a12b614547b72d2a22c8f8e7e7,
title = "New Approach for Large-Area Thermoelectric Junctions with a Liquid Eutectic Gallium-Indium Electrode",
abstract = "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.",
keywords = "EGaIn, large-area junction thermopower, Molecular thermoelectrics, self-assembled monolayers, soft top-contact",
author = "Sohyun Park and Yoon, {Hyo Jae}",
year = "2018",
month = "1",
day = "1",
doi = "10.1021/acs.nanolett.8b03404",
language = "English",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",

}

TY - JOUR

T1 - New Approach for Large-Area Thermoelectric Junctions with a Liquid Eutectic Gallium-Indium Electrode

AU - Park, Sohyun

AU - Yoon, Hyo Jae

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - EGaIn

KW - large-area junction thermopower

KW - Molecular thermoelectrics

KW - self-assembled monolayers

KW - soft top-contact

UR - http://www.scopus.com/inward/record.url?scp=85056778198&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056778198&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.8b03404

DO - 10.1021/acs.nanolett.8b03404

M3 - Article

C2 - 30418032

AN - SCOPUS:85056778198

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

ER -