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Enhanced Thermopower of Saturated Molecules by Noncovalent Anchor-Induced Electron Doping of Single-Layer Graphene Electrode

Authors
Park, SohyunKim, Hwa RangKim, JuheeHong, Byung-HeeYoon, Hyo Jae
Issue Date
10월-2021
Publisher
WILEY-V C H VERLAG GMBH
Keywords
EGaIn; Seebeck effect; graphene; molecular thermoelectrics; self-assembled monolayers
Citation
ADVANCED MATERIALS, v.33, no.41
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED MATERIALS
Volume
33
Number
41
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136259
DOI
10.1002/adma.202103177
ISSN
0935-9648
Abstract
Enhancing thermopower is a key goal in organic and molecular thermoelectrics. Herein, it is shown that introducing noncovalent contact with a single-layer graphene (SLG) electrode improves the thermopower of saturated molecules as compared to the traditional gold-thiolate covalent contact. Thermoelectric junction measurements with a liquid-metal technique reveal that the value of Seebeck coefficient in large-area junctions based on n-alkylamine self-assembled monolayers (SAMs) on SLG is increased up to fivefold compared to the analogous junction based on n-alkanethiolate SAMs on gold. Experiments with Raman spectroscopy and field-effect transistor analysis indicate that such enhancements benefit from the creation of new in-gap states and electron doping through noncovalent interaction between the amine anchor and the SLG electrode, which leads to a reduced energy offset between the Fermi level and the transport channel. This work demonstrates that control of interfacial bonding nature in molecular junctions improves the Seebeck effect in saturated molecules.
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