Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.196601
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Funding
- NSF [DMR-0846748, DMR-0938330]
- ORNL
- DOE Office of Basic Energy Sciences
- DOE [DE-FG02-09ER46554, DE-AC02-06CH11357]
- McMinn Endowment, Vanderbilt University
- U.S. Army Research Office [W911NF-10-1-0147]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0846784] Funding Source: National Science Foundation
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Ca3Co4O9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca3Co4O9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4+-ions in a higher spin state compared to that of bulk Ca3Co4O9. The higher Seebeck coefficient makes the Ca3Co4O9 system suitable for many high temperature waste-heat-recovery applications.
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