Single semiconductor nanowires with a strong quantum confinement effect – quantum wires (QWs) – are of great interest for applications in high -end optoelectronics and image processing. In addition to Cd’s innovations, ZnSe QWs, as a heavy-metal-free semiconductor, have demonstrated great potential for next-generation environmental applications.
Unfortunately, ZnSe nanowires produced so far have been limited to a strong quantum confinement state with near-violet-light absorption or a large state with unscernible exciton features. At the same time, on demand, and high -precision manipulations of their radial and axial magnitude – to allow strong quantum confinement in the blue -light field – it is very difficult, the which greatly hindered their further application.
In a recent article published on National Science Review, a research group led by professor YU Shuhong at the University of Science and Technology of China (USTC) demonstrated the combination of high, red-red-active ZnSe QWs in the development of a simple synthetic pathway – two steps. The catalytic development system achieves independent, high precision, and wide -range controls over the diameter and length of ZnSe QWs. In this way, they bridge the gap between the original ZnSe QWs and ZnSe nanowires as a whole.
The researchers found a new epitaxial pattern between the cubic-phase catalyst instructions and the wurtzite ZnSe QWs kinetically preferred to form ultrathin QWs, stacking fault-free QWs. The capture of the quantum energy, the power of high volume, and the absence of the combined particles lead to their melting, ultranarrow excitonic absorption in the red -blue part with a full width in half height (FWHM) of sub-13 nm. After thiol surface passivation, they re-eliminated the surface electron traps in these ZnSe QWs, resulting in longer carriers and high solar-to-H performance.2 conversion.
The two -step growth phase is expected due to the large number of colloidal nanowires. The availability of such high-end nanowires will provide a valuable resource for heavy-metal free applications in solar fuels and optoelectronics in the future.
Two-photon absorption and stimulation of poly-crystalline zinc selenide with femtosecond laser excitation
Yi Li et al, On demand describing high ZnSe, light-active quantum colloidal wires, National Science Review (2022). DOI: 10.1093 / nsr / nwac025
Presented by Science China Press
Directions: Pathway to ZnSe quantum high quality wire (2022, April 8) retrieved April 9, 2022 from https://phys.org/news/2022-04-pathway-high-quality-znse-quantum-wires .html
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