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Enhanced Thermopower in PbSe Nanocrystal Quantum Dot Superlattices
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and Arun Majumdar*†
Department of Mechanical Engineering, University of California, Berkeley.
, ‡The Molecular Foundry, Lawrence Berkeley National Laboratory.
, §Department of Chemistry, University of Chicago.
, Department of Chemical Engineering, University of California, Berkeley.
, Department of Materials Science and Engineering, University of California, Berkeley.
Section:Abstract
We examine the effect of strong three-dimensional quantum confinement on the thermopower and electrical conductivity of PbSe nanocrystal superlattices. We show that for comparable carrier concentrations PbSe nanocrystal superlattices exhibit a substantial thermopower enhancement of several hundred microvolts per Kelvin relative to bulk PbSe. We also find that thermopower increases monotonically as the nanocrystal size decreases due to changes in carrier concentration. Lastly, we demonstrate that thermopower of PbSe nanocrystal solids can be tailored by charge-transfer doping.
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History
- Published In Issue August 13, 2008
- Article ASAPJuly 03, 2008
- Received: April 5, 2008
Revised: June 6, 2008
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