Growth of quantum dot coated core-shell anisotropic nanowires for improved thermal and electronic transport

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 cm 2 /Vs) as well as a diameter independent low thermal conductivity (1.53 6 1 W/m K). 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.

Copper–Indium Binary Catalyst on a Gas Diffusion Electrode for High-Performance CO2 Electrochemical Reduction with Record CO Production Efficiency

“…The featureless area shaped like a shell with 3~10 nm thickness tightly capping on the polycrystalline Cu phase, corresponds to the amorphous In(OH)3 layer. The SAED images in Figure 1g show both amorphous and crystalline characteristics and the crystalline phase consists of polycrystalline Cu, and Cu2O mixture (denoted as CuxO) agree with the lattice fringes in the HRTEM image [28][29] . The microscopy analysis indicates the amorphous/crystalline hybrid structure of CuIn-ESP25min: the nanolayer of amorphous In(OH)3 capping on the polycrystalline CuxO.…”

Optical and Thermoelectric Properties of Surface-Oxidation Sensitive Layered Zirconium Dichalcogenides ZrS2−xSex (x = 0, 1, 2) Crystals Grown by Chemical Vapor Transport

“…In earlier research, the first principle thermoelectric properties of zirconium dichalcogenides was reported by a number of authors [20,21]; nevertheless, experimental works on thermoelectric properties of ZrX 2 (X = S, Se) have rarely been reported. Some of the 1D nanowire and nanoscale thermoelectric materials have been claimed to have improved thermo-electronic transport property [22,23]; however, to date, experimental thermoelectric measurements on the Zr-based ZrS 2 , ZrSSe, and ZrSe 2 layered TMDCs are seldom found in the literature, in spite of some thermoelectric materials [24][25][26][27] having been reported for power-generation applications. In this paper, the optical and thermoelectric properties of ZrS 2−x Se x (x = 0, 1, and 2) were characterized using temperature-dependent transmittance, Raman, and thermoelectric measurements from low to room temperature.…”

Indoor photovoltaics, The Next Big Trend in solution‐processed solar cells

“…Colloidal quantum dots are a type of nanoscale semiconductor crystals that exhibit unique optical, electrical properties, including size‐dependent light absorption, excellent stability, high charge mobility, and facile synthesis 11,49‐56 . Till now, PCE of QDSCs has been improved up to 13% 13,49,57‐64 .…”