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Excitons to Transform Future of Everyday Electronic Devices

Excitons are quasiparticles created from the excited state of electrons and – in accordance with research being conducted EPFL – have the potential to boost the power efficiency of everyday gadgets.

It’s an entirely new way of thinking about electronics. Excitons – or quasiparticles formed when electrons take in light – stand to change the building blocks of circuits. Scientists at EPFL have been studying their extraordinary properties so as to design more energy-efficient digital systems, and have now discovered a way to control excitons better shifting in semiconductors. Their findings come in Nature Nanotechnology.

Quasiparticles are temporary phenomena ensuing from the interaction between two particles within a strong matter. Excitons are formed when an electron absorbs a photon and moves into a higher energy state, abandoning a hole in its earlier energy state (called a “valence band” in-band concept). The electron and electron-hole are bound collectively by attractive forces, and the two together form an exciton. Once the electron falls back into the hole, it emits a photon, and the exciton ceases to exist.

In 2018, a group of scientists from EPFL’s Laboratory of Nanoscale Electronics and Structures (LANES) introduced that they had developed a transistor – one of many components of circuits – that runs on excitons rather than electrons. And for the first time, they had been able to make the transistors operate at room temperature — a vital step forward for growing applications for this technology.

To make the excitons last longer, the scientists layered two different 2D materials on high of one another: tungsten diselenide (WSe2) and molybdenum diselenide (MoSe2). The resulting material had a sparkling texture that influenced how the quasiparticles had been distributed.

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Clement Gutierrez

Clement works as the lead of the electronic devices column. He is fantastic at his work and can edit the articles very much efficiently. The unique thing about him is the speed of his work. Apart from working at a stretch in his rare leisure times, he loves to go through the internet in search of recent news of the tech market. He has been working in our organization for a span of 6 years now.

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