Silicon is a common material for making computer chips. Recently, researchers from the Australian National University (ANU) and University College London have teamed up to create laser-induced tiny explosions on silicon to create a variety of exotic new materials. The researchers believe that this new technology is expected to bring more simplified innovation and manufacturing processes to the superconducting, high-efficiency solar cells and light sensor fields.
The research leader, ANU laser physicist Andre Rodriguez, said: “We created two new crystal arrangements, or phase states, from silicon, and it seems that we could create four more. According to theoretical predictions, these The electronic properties of materials are very interesting, such as variable band gaps, proper doping may become superconductors, etc."
According to the report of the Physicist Organization Network on June 29th, the research team focused the laser on the silicon buried under the silicon dioxide layer and could reliably blow out small pits on the solid silicon, which would generate extremely high pressure around the explosion point. To form a new phase. The new phase structure is complex and it took the team a year to understand it.
Professor Jim Williams of the ANU Electronic Materials Engineering Group said that they combined two methods of electron diffraction pattern and structure prediction and found that in the crystal structure of these new materials, atoms are arranged in 12, 16 or 32 numbers respectively. "Micro-explosions have changed the simple structure of silicon into an extremely complex structure, which may give them rare, unexpected properties."
Professor Eugene Gamalie of the ANU Institute of Physics and Engineering said that these complex phases are usually unstable, but because of their small size, new materials can quickly cool and solidify before they deteriorate. At present, these new crystal structures can be preserved for more than one year.
Traditionally, new materials are created by micro-diamond anvils or extruded materials, and ultra-short laser microburst pressures are many times higher than those produced by diamond anvils.
The new method of the research team is expected to make these special materials cheaper and easier for large-scale industrial manufacturing. "We can confidently create thousands of micron-sized modification areas on ordinary silicon in one second," said Judi Bradbay, Ph.D., ANU's Institute of Physics and Engineering, "The value of the semiconductor industry is dozens. Billion US dollars, even if there are only slight changes in some of the silicon atoms in place, it may have a significant impact.†(Reporter Chang Lijun)
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