MIT researchers let AI identify materials’ best strain options: Page 2 of 2

February 12, 2019 //By Julien Happich
MIT researchers let AI identify materials’ best strain options
In a paper titled "Deep elastic strain engineering of bandgap through machine learning", a team of researchers at MIT and in Russia and Singapore present how they were able to leverage artificial intelligence to predict the property changes of different semiconductor or crystalline materials based on specific strain levels and orientations.

“Now we have this very high-accuracy method” that drastically reduces the complexity of the calculations needed, Li explains, thanks to a novel and systematic AI-powered exploration of materials’ property changes based on strain.

The new method, the researchers say, could open up possibilities for creating materials tuned precisely for electronic, optoelectronic, and photonic devices that could find uses for communications, information processing, and energy applications.

The team studied the effects of strain on the bandgap of both silicon and diamond. Using their neural network algorithm, they were able to predict with high accuracy how different amounts and orientations of strain would affect the bandgap.

“Tuning” of a bandgap can be a key tool for improving the efficiency of a device, such as a silicon solar cell, by getting it to match more precisely the kind of energy source that it is designed to harness.

Whereas this study focused specifically on the effects of strain on the materials’ bandgap, “the method is generalizable” to other aspects, which affect not only electronic properties but also other properties such as photonic and magnetic behavior, Li says.

From the 1 percent strain now being used in commercial chips, many new applications open up now that this team has shown that strains of nearly 10 percent are possible without fracturing. “When you get to more than 7 percent strain, you really change a lot in the material,” he says. The work was supported by the MIT-Skoltech program and Nanyang Technological University.


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