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Title
Japanese:Mechanically Tuned Thermopower of Single-Molecule Junctions 
English:Mechanically Tuned Thermopower of Single-Molecule Junctions 
Author
Japanese: Shintaro Fujii, Enrique Montes, Haruna Cho, Yi Yue, Masaaki Koike, Tomoaki Nishino, Hﾃｩctor Vﾃ｡zquez, Manabu Kiguchi.  
English: Shintaro Fujii, Enrique Montes, Haruna Cho, Yi Yue, Masaaki Koike, Tomoaki Nishino, Hﾃｩctor Vﾃ｡zquez, Manabu Kiguchi.  
Language English 
Journal/Book name
Japanese:Advanced Electronic Materials 
English:Advanced Electronic Materials 
Volume, Number, Page Vol. 8    No. 12    pp. 2200700
Published date Oct. 2022 
Publisher
Japanese:John Wiley & Sons, Ltd 
English:John Wiley & Sons, Ltd 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1002/aelm.202200700
 
DOI https://doi.org/10.1002/aelm.202200700
Abstract Abstract In this paper, the tuning of the thermopower with single-molecule junctions of fullerene (C60), 4,4?-bipyridine (BPY), and p-phenylenediamine (PPD) using scanning tunneling microscopy (STM)-based break junction technique is demonstrated. Single-molecule junctions are prepared in a nanogap between a Au-STM tip and a Au(111) electrode. Upon applying a temperature difference across the junction, a thermoelectric voltage is generated across it. By mechanically controlling the tip?electrode separation distance, the thermoelectric voltage of the junction is tuned. The absolute value of the thermopower decreases with decreasing tip?electrode separation distance for BPY and PPD, while it increases for C60. Atomistic simulations of the junction illustrate how this arises from shifts in the conduction orbital energies induced by the mechanical compression of the junctions.

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