Enhanced thermopower in PbSe nanocrystal quantum dot superlattices.
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.
Wang
Robert Y
RY
Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA.
Feser
Joseph P
JP
Lee
Jong-Soo
JS
Talapin
Dmitri V
DV
Segalman
Rachel
R
Majumdar
Arun
A