RT Journal Article
SR Electronic
T1 Thermoelectricity in Molecular Junctions
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1568
OP 1571
DO 10.1126/science.1137149
VO 315
IS 5818
A1 Reddy, Pramod
A1 Jang, Sung-Yeon
A1 Segalman, Rachel A.
A1 Majumdar, Arun
YR 2007
UL http://science.sciencemag.org/content/315/5818/1568.abstract
AB By trapping molecules between two gold electrodes with a temperature difference across them, the junction Seebeck coefficients of 1,4-benzenedithiol (BDT), 4,4′-dibenzenedithiol, and 4,4′′-tribenzenedithiol in contact with gold were measured at room temperature to be +8.7 ± 2.1 microvolts per kelvin (μV/K), +12.9 ± 2.2 μV/K, and +14.2 ± 3.2 μV/K, respectively (where the error is the full width half maximum of the statistical distributions). The positive sign unambiguously indicates p-type (hole) conduction in these heterojunctions, whereas the Au Fermi level position for Au-BDT-Au junctions was identified to be 1.2 eV above the highest occupied molecular orbital level of BDT. The ability to study thermoelectricity in molecular junctions provides the opportunity to address these fundamental unanswered questions about their electronic structure and to begin exploring molecular thermoelectric energy conversion.