Scientists have discovered a new and much simpler way to produce a rare form of silicon that could improve batteries and electronic devices while reducing manufacturing costs.
The breakthrough could also save large amounts of energy during production, making it attractive for future industrial use.
The research was carried out by an international team that included scientists from the U.S. Department of Energy’s Oak Ridge National Laboratory (ORNL). Their findings were published in the journal Materials Today.
Silicon is one of the most common elements on Earth, second only to oxygen.
It is already widely used in electronics and batteries because it is inexpensive and conducts electricity well.
However, scientists have long been interested in a rare form of silicon called R8, which has properties that could make batteries and electronic devices even more efficient.
The problem is that R8 silicon does not occur naturally.
Until now, producing it has required crushing ordinary crystalline silicon under extremely high pressure. This process is expensive, complicated, and uses a great deal of energy, making it difficult to produce on a large scale.
The research team wanted to find an easier solution.
Instead of starting with ordinary crystalline silicon, they used amorphous silicon, a less organized form of the material that has a random, glass-like structure. Because its atoms are not arranged in a regular pattern, amorphous silicon is much more flexible when pressure is applied.
The researchers discovered that by compressing amorphous silicon at room temperature, using about 25% less pressure than traditional methods, the material naturally rearranged itself into the valuable R8 crystal structure.
The scientists describe this process as a type of “density matching.” As the material becomes denser, its atoms automatically organize into the right arrangement, almost like puzzle pieces finding where they belong without being forced into place.
To watch this transformation happen, the team used powerful scientific instruments that fire neutrons and X-rays at the material. These tools allowed them to observe the atomic changes in real time as the silicon was compressed.
The researchers also used advanced computer simulations to confirm what they observed in the laboratory. High-performance computers modeled the behavior of the atoms under different conditions and showed that the experimental results were accurate.
The computer models revealed why the new method works so well. The flexible structure of amorphous silicon allows the atoms to take a direct path to the R8 structure. In contrast, ordinary crystalline silicon must pass through several complicated intermediate stages before reaching the same result.
The researchers also tested the same idea on germanium, an element closely related to silicon that is used in fiber-optic communication systems and other electronic technologies. They found that the density-matching approach worked there as well.
This suggests the technique may not be limited to silicon alone. In the future, scientists hope it could be used to produce other advanced materials more efficiently.
If the process can be successfully scaled up for manufacturing, it could lower production costs, reduce energy use, and make high-performance materials more widely available for next-generation batteries, electronics, and other important technologies.
