A pathway to high-quality ZnSe quantum wires
2 mins read

A pathway to high-quality ZnSe quantum wires

USTC found a pathway to high-quality ZnSe quantum wires
(a) The answer-solid-solid development mechanism. (b) Two-step catalyzed development for impartial radial and axial dimension management of ZnSe QWs. Credit score: Science China Press

One-dimensional semiconductor nanowires with sturdy quantum confinement impact—quantum wires (QWs)—are of nice curiosity for functions in superior optoelectronics and photochemical conversions. Past the state-of-the-art Cd-containing ones, ZnSe QWs, as a consultant heavy-metal-free semiconductor, have proven the utmost potential for next-generation environmental-friendly functions.

Sadly, ZnSe nanowires produced up to now are largely restricted to the sturdy quantum confinement regime with near-violet-light absorption or to the majority regime with undiscernible exciton options. Simultaneous, on-demand, and high-precision manipulations on their radial and axial sizes—that enables sturdy quantum confinement within the blue-light area—has up to now been difficult, which considerably impedes their additional functions.

In a brand new article revealed within the Nationwide Science Overview, a analysis group led by professor YU Shuhong at College of Science and Know-how of China (USTC) has reported the on-demand synthesis of high-quality, blue-light-active ZnSe QWs by creating a versatile artificial method—a two-step catalytic development technique that permits impartial, high-precision, and wide-range controls over the diameter and size of ZnSe QWs. On this manner, they bridge the hole between prior magic-sized ZnSe QWs and bulk-like ZnSe nanowires.

The researchers discovered {that a} new epitaxial orientation between the cubic-phase catalyst ideas and wurtzite ZnSe QWs kinetically favors the formation of ultrathin, stacking-fault free QWs. The sturdy , high-degree dimension management, and the absence of combined phases collectively result in their well-defined, ultranarrow excitonic absorption within the blue-light area with full width at half most (FWHM) of sub-13 nm. After floor thiol passivation, they additional eradicated the floor electron traps in these ZnSe QWs, leading to long-lived and high-efficiency solar-to-H2 conversion.

The 2-step catalyzed development technique is believed to be normal for a wide range of colloidal nanowires. The entry to these high-quality nanowires would thus provide a flexible materials library for heavy-metal free functions in photo voltaic fuels and optoelectronics sooner or later.

Two-photon absorption and stimulated emission in poly-crystalline zinc selenide with femtosecond laser excitation

Extra data:
Yi Li et al, On demand defining high-quality, blue-light-active ZnSe colloidal quantum wires, Nationwide Science Overview (2022). DOI: 10.1093/nsr/nwac025

A pathway to high-quality ZnSe quantum wires (2022, April 8)
retrieved 9 April 2022
from https://phys.org/information/2022-04-pathway-high-quality-znse-quantum-wires.html

This doc is topic to copyright. Aside from any honest dealing for the aim of personal examine or analysis, no
half could also be reproduced with out the written permission. The content material is supplied for data functions solely.

Leave a Reply

Your email address will not be published. Required fields are marked *