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 language | English |
|---|---|
| Journal | Nano Letters |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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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 journal › Article
}
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 -