Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Engineering the thermopower of C60 molecular junctions
AU - Evangeli, Charalambos
AU - Gillemot, Katalin
AU - Leary, Edmund
AU - Gonzalez, M. Teresa
AU - Rubio-Bollinger, Gabino
AU - Lambert, Colin
AU - Agrait, Nicolas
PY - 2013/4/1
Y1 - 2013/4/1
N2 - We report the measurement of conductance and thermopower of C60 molecular junctions using a scanning tunneling microscope (STM). In contrast to previous measurements, we use the imaging capability of the STM to determine precisely the number of molecules in the junction and measure thermopower and conductance continuously and simultaneously during formation and breaking of the molecular junction, achieving a complete characterization at the single-molecule level. We find that the thermopower of C60 dimers formed by trapping a C60 on the tip and contacting an isolated C60 almost doubles with respect to that of a single C60 and is among the highest values measured to date for organic materials. Density functional theory calculations show that the thermopower and the figure of merit continue increasing with the number of C60 molecules, demonstrating the enhancement of thermoelectric preformance by manipulation of intermolecular interactions.
AB - We report the measurement of conductance and thermopower of C60 molecular junctions using a scanning tunneling microscope (STM). In contrast to previous measurements, we use the imaging capability of the STM to determine precisely the number of molecules in the junction and measure thermopower and conductance continuously and simultaneously during formation and breaking of the molecular junction, achieving a complete characterization at the single-molecule level. We find that the thermopower of C60 dimers formed by trapping a C60 on the tip and contacting an isolated C60 almost doubles with respect to that of a single C60 and is among the highest values measured to date for organic materials. Density functional theory calculations show that the thermopower and the figure of merit continue increasing with the number of C60 molecules, demonstrating the enhancement of thermoelectric preformance by manipulation of intermolecular interactions.
KW - Molecular thermopower
KW - molecular conductance
KW - density functional theory
KW - single molecule
KW - THERMOELECTRICITY
KW - HETEROJUNCTIONS
KW - CONDUCTANCE
U2 - 10.1021/nl400579g
DO - 10.1021/nl400579g
M3 - Journal article
AN - SCOPUS:84877271652
VL - 13
SP - 2141
EP - 2145
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 5
ER -