Mind the Band Gap: Breakthrough in Nanoscale Selenium Unlocks New Frontier in Semiconductor Design

Nanoscale selenium research

For decades, the electronic band gap of semiconductors has been tailored through chemical modification — a complex and energy-intensive approach. But what if a material’s electronic properties could be tuned simply by changing its size? In a stunning leap forward, researchers have now demonstrated that nanoscale forms of selenium — an elemental semiconductor — can achieve tunable band gaps without altering chemical composition.

A One-Element Strategy for Multi-Purpose Electronics

This collaborative work, led by scientists from the University of Nottingham, EPSRC SuperSTEM, Ulm University in Germany, and BNNT LLC in the U.S., repositions selenium — historically used in early solar cells — at the frontier of semiconductor nanotechnology. Their method employs nano test tubes made of boron nitride to confine selenium into ultra-thin nanowires and observe how its atomic structure transforms as diameter shrinks.

At sub-nanometer scales, selenium’s bonding geometry shifts, altering the material's band gap in a controllable and continuous way. By capturing these transformations using transmission electron microscopy and electron energy loss spectroscopy, researchers generated a new phase diagram that correlates nanowire thickness to electronic behavior.

Watching Chemistry Evolve Atom by Atom

Using nanotubes as transparent vessels, the team observed selenium nanowires stretching and thinning under imaging — a phenomenon reminiscent of squeezing toothpaste. This live transformation revealed how quantum confinement and bond distortion jointly define the electrical characteristics of each wire.

Professor Quentin Ramasse, Director of SuperSTEM, noted that boron nitride nanotubes were essential for this breakthrough, as they allow clear observation of electronic transitions that would otherwise be masked by carbon nanotubes. Dr. Will Cull, who led the experimental work, emphasized how “revitalizing” a well-known element like selenium at the atomic level opens doors to building versatile, custom electronics from a single ingredient.

Implications for the Future of Nanoelectronics

In an age driven by Moore’s Law, where miniaturization is paramount, these findings point to new ways of engineering semiconductors without requiring compound doping or complex fabrication. The tunable band gap of selenium nanowires could revolutionize next-gen solar cells, transistors, and optoelectronic devices.

This work also sets a new benchmark in real-time nanochemistry, capturing dynamic transformations inside single atoms — a technique that could evolve into a new standard for material characterization at the atomic level.

For more information, read the full article on Phys.org: https://phys.org/news/2025-05-mind-band-gap-nanoscale-elementary.html

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Published by Quantum Server Networks | Where Materials Science Meets the Future

#BandGapEngineering #SeleniumNanowires #Nanoelectronics #QuantumMaterials #AdvancedMicroscopy #ElectronMicroscopy #SemiconductorResearch #MooresLaw #ScientificBreakthrough #QuantumServerNetworks

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