“Exciton surfing” has the potential to enable next-generation energy, computing and communication technologies

This chip can move excitons with sound waves. This achievement paves the way for building efficient devices that use excitons for data communication and processing, sensing, and energy transformation applications. Credit: Silvia Cardarelli

Quasiparticles formed from semiconductors can now move at room temperature, according to a study led by the University of Michigan. This discovery has the potential to cool computers, enable faster speeds and higher efficiency, and make LEDs and solar panels more efficient.

Today’s electronic devices rely on electrons to move both energy and information, but about half of that energy is Electrical resistance.. Excitons that avoid traditional electrical losses are one potential alternative.

“Given nearly 20 years, computers have always been a few gigahertz and never speed up. That’s why they get too hot,” said Parag Deotare, an assistant professor of electrical engineering. .. computer Corresponding authors of science and research.

“But if you can get rid of the excess heat quickly, the transistor can go faster. Just by reducing the loss of communication energy, the processing speed will increase automatically. Using excitons, theoretically Can significantly reduce these losses. “

Ann Exciton Are negatively charged electrons and positively charged “holes” that stick together like a single particle. When a semiconductor absorbs light, excitons are formed, driving electrons out of the spot. semiconductor Create crystals and holes, like a solar cell. Alternatively, it can be guided through electricity, such as LED lights and future computer processors. However, because they are charge-neutral, excitons cannot move around with different potentials like electrons.

The amendments made by Deotare and his team, including collaborators at the National Institute for Materials Science in Japan, are: Sound wave Run through the material. They have shown that excitons can move from one location to another within a semiconductor chip and “surf” these waves. Deotare suggests that controlling excitons in this way enables data communication and may lead to transistor replacement.

“The ability to induce excitons paves the way for exciting future applications including efficient energy transformation, sensing, detection, room temperature, on-chip exciton information processing and communication,” said Electrical and Computer Engineering. Kanak Datta, a doctoral student and lead, said. The author of the study.

of Solar cellMove excitons from a relatively thick layer of semiconductor that absorbs photons or particles of light, turning them into excitons.If excitons can be moved to Thin layer Energy can be converted to electricity more efficiently before separating electrons and holes.

Similarly, LEDs can reduce the amount of light lost in the LED by moving excitons. Exciton can move away from the electrode to a region designed to extract light from a semiconductor before electrons and holes combine to form photons.

“Our method provides adjustable and flexible, and manufacturable design for designing exciton transport for specific applications,” said a PhD student in Applied Physics in a dissertation. The second author, Zhengyang Lyu, states.

Until recently, attempts to control excitons have been driven to very low temperatures. room temperature, Electrons and holes quickly fall apart. However, new “2D” semiconductors made of single crystal layers have changed the class of materials, especially known as transition metal dicalcogenides. This is the name of where the component comes from in the periodic table.

Deotare’s group used one of these, tungsten diselenium, to support excitons. To create sound waves for surfing, they placed their single-layer semiconductors on lithium niobate, a material that expands and contracts in the presence of an electric field.

They used a set of lithium niobate electrodes to create a wavy electric field that generated sound waves. The team protected tungsten diselened with a layer of boron nitride because the electric field can split the electrons and holes that form excitons.

Zidong Li, a PhD student in electrical and computer engineering, said: ..

The study is published at Nature photonics..

Towards Straintronics: Derivation of Exciton in 2D Materials

For more information:
Kanak Datta et al, spatiotemporally controlled room temperature exciton transport under dynamic strain, Nature photonics (2022). DOI: 10.1038 / s41566-021-00951-3

Quote: “Exciton Surfing” is the next generation of energy, computing, acquired from on February 15, 2022. And may enable communication technology (February 15, 2022)-energy.html

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“Exciton surfing” has the potential to enable next-generation energy, computing and communication technologies

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