A pathway to high-quality ZnSe quantum wires
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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

Quotation:
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

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