Growth of quantum dot coated core-shell anisoptopic nanowires for improved thermal and electronic transport
Journal
APL (Applied Physics Letters)
Date
2019.06.17
Abstract
Anisotropic nanowires are promising candidates for electronic thermal management due to their unique electrical and thermal properties.
However, eco-friendly solution-processed nanomaterials with an elaborate morphology and microstructure for modulating thermal and
charge transfer are still a considerable challenge. Herein, we present a simple but effective approach for synthesizing pseudo core-shell nanowires
through quantum dot (QD)-like nanostructure coating (p-NW@QD) to generate exceptional electron-phonon transport properties.
With the assistance of diphenyl ether as a coordination solvent, high crystallinity lead sulfide NWs can be fabricated with a large aspect ratio
together with uniform QD coating. This p-NW@QD exhibits high electronic mobility (30.65 cm2/Vs) as well as a diameter independent low
thermal conductivity (1.5361W/mK). Direct charge/heat carrier flow measurements and computational simulations demonstrate that the
unusual electrical and thermal transport phenomenon is strongly dependent on the fast charge transport through the QD shell, and a slow
phonon migration across the Umklapp process dominated NW cores. These findings indicate a significant step toward colloidal synthesis
nanostructures for future high-performance nanoelectronics and thermal energy devices.