A novel machine learning model for the characterization of material surfaces

A novel machine learning model for the characterization of material surfaces
Credit: Journal of the American Chemical Society (2024). DOI: 10.1021/jacs.3c13574

Machine learning (ML) enables the accurate and efficient computation of fundamental electronic properties of binary and ternary oxide surfaces, as shown by scientists from Tokyo Tech. Their ML-based model could be extended to other compounds and properties. The findings, published in the Journal of the American Chemical Society, could aid in the screening of surface properties of materials as well as in the development of functional materials.

googletag.cmd.push(function() { googletag.display(‘div-gpt-ad-1449240174198-2’); });

The design and development of novel materials with superior properties demands a comprehensive analysis of their atomic and electronic structures.

Electron energy parameters such as ionization potential (IP), the energy needed to remove an electron from the valence band maximum, and electron affinity (EA), the amount of energy released upon the attachment of an electron to the conduction band minimum, reveal important information about the electronic band structure of surfaces of semiconductors, insulators, and dielectrics.

The accurate estimation of IPs and EAs in such nonmetallic materials can indicate their applicability for use as functional surfaces and interfaces in photosensitive equipment and optoelectronic devices.

Additionally, IPs and EAs depend significantly on the surface structures, which adds another dimension to the complex procedure of their quantification. Traditional computation of IPs and EAs involves the use of accurate first-principles calculations, where the bulk and surface systems are separately quantified. This time-consuming process prevents quantifying IPs and EAs for many surfaces, which necessitates the use of computationally efficient approaches.

To address the wide-ranging issues affecting the quantification of IPs and EAs of nonmetallic solids, a team of scientists from Tokyo Institute of Technology (Tokyo Tech), led by Professor Fumiyasu Oba, have turned their focus towards ML.

(adsbygoogle = window.adsbygoogle || []).push({});

Prof. Oba says, “In recent years, ML has gained a lot of attention in materials science research. The ability to virtually screen materials based on ML technology is a very efficient way to explore novel materials with superior properties. Also, the ability to train large datasets using accurate theoretical calculations allows for the successful prediction of important surface characteristics and their functional implications.”

The researchers employed an artificial neural network to develop a regression model, incorporating the smooth overlap of atom positions (SOAPs) as numerical input data. Their model accurately and efficiently predicted the IPs and EAs of binary oxide surfaces by using the information on bulk crystal structures and surface termination planes.

Moreover, the ML-based prediction model could “transfer learning,” a scenario where a model developed for a particular purpose can be made to incorporate newer datasets and reapplied for additional tasks. The scientists included the effects of multiple cations in their model by developing “learnable” SOAPs and predicted the IPs and EAs of ternary oxides using transfer learning.

Prof. Oba concludes, “Our model is not restricted to the prediction of surface properties of oxides but can be extended to study other compounds and their properties.”

More information:
Shin Kiyohara et al, Band Alignment of Oxides by Learnable Structural-Descriptor-Aided Neural Network and Transfer Learning, Journal of the American Chemical Society (2024). DOI: 10.1021/jacs.3c13574

Journal information:Journal of the American Chemical Society

Provided by
Tokyo Institute of Technology

READ MORE

Can I File Someone Else’s Taxes?

If you’re willing to offer a helping hand to a friend at tax time, just [...]

Flooring Tips and Tricks

Explore flooring options tips and tricks. iStockphoto/Thinkstock The dining room is a great place to [...]

Bacteria-sized robots take on microplastics and win by breaking them down

Metallic microrobots (dark blue dots) colonize a jagged piece of microplastic under visible light, breaking [...]

Yeast dust makes a cheap, fast virus test

Design of SynBioNFs as a reagent for disease detection. a,b, Generation (a) and universal application [...]

What Is Shadow Work and How Does It, Well, Work?

Journaling is one way to engage in shadow work, an important exploration of parts of [...]

Playing Recordings of a Healthy Ocean Can Help Restore Marine Ecosystems

A growing body of work shows that marine animals are attracted to the sounds of [...]

Falling for Field Books

James Eike’s field book entry for April 6, 1971; his 31st Anniversary. (Record Unit 7342 [...]

‘Vampire’ bacteria thirst for human blood — and cause deadly infections as they feed

Several bacteria that can cause deadly bloodstream infections in humans are attracted to an amino [...]