Describing Point Defect Topology in 2D Energy Materials Through Computer Vision

Point defects such as vacancies and impurity atoms strongly impact the performance of 2D materials. Traditional efforts often rely on manual detection, a process that is time-intensive, prone to human error, and challenging to scale. Here we leverage machine learning (ML) methods to identify and quantify vacancies within 2D transition metal carbides (Ti3C2, MXenes), aiming to expedite detection while improving accuracy. MXenes exhibit valuable defect-defined electrochemical properties, but we currently lack statistical understanding of defect topology needed to fully harness these materials. We employ a convolutional neural network for semantic segmentation of experimental MXene images, opening an opportunity to conduct a rigorous statistical study on defect hierarchy while investigating local relaxation in the lattice. We show how the integration of ML can yield fundamental insight into point defects, providing a powerful tool that will play an increasingly crucial role in the future of materials science.. Authors: Guinan, Grace [National Renewable Energy Lab., Golden, CO (United States)]; Salvador, Addison [National Renewable Energy Lab., Golden, CO (United States)]; Smeaton, Michelle [National Renewable Energy Lab., Golden, CO (United States)]; Egan, Hilary [National Renewable Energy Lab., Golden, CO (United States)]; Glaws, Andrew [National Renewable Energy Lab., Golden, CO (United States)]. DOE Contract: AC36-08GO28308. Subjects: 2D materials; 36 MATERIALS SCIENCE; 97 MATHEMATICS AND COMPUTING; computer vision; electron microscopy; machine learning; point defects; topology