Orientational control of molecular scale thermoelectricity.

Orientational control of molecular scale thermoelectricity.
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DOI:
10.1039/d2na00515h
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发表时间:
2022-10-25
期刊:
影响因子:
4.7
通讯作者:
Ismael, Ali
Ismael, Ali
中科院分区:
材料科学3区
文献类型:
--
作者:
Alshammari, Majed;Al-Jobory, Alaa A.;Alotaibi, Turki;Lambert, Colin J.;Ismael, Ali

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Through a comprehensive theoretical study, we demonstrate that single-molecule junctions formed from asymmetric molecules with different terminal groups can exhibit Seebeck coefficients, whose sign depends on the orientation of the molecule within the junction. Three anthracene-based molecules are studied, one of which exhibits this bi-thermoelectric behaviour, due to the presence of a thioacetate terminal group at one end and a pyridyl terminal group at the other. A pre-requisite for obtaining this behaviour is the use of junction electrodes formed from different materials. In our case, we use gold as the bottom electrode and graphene-coated gold as the top electrode. This demonstration of bi-thermoelecricity means that if molecules with alternating orientations can be deposited on a substrate, then they form a basis for boosting the thermovoltage in molecular-scale thermoelectric energy generators (TEGs). Through a comprehensive study, we demonstrate that single-molecule junctions formed from asymmetric molecules with different terminal groups can exhibit Seebeck coefficients, whose sign depends on the orientation of the molecule within the junction.
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