Atomic-Scale Imaging Reveals Hidden Defects in Computer Chips

Researchers have developed a new imaging technique, electron ptychography, that allows visualization of atomic-scale defects within computer chips. This breakthrough, a collaboration between Cornell University, Taiwan Semiconductor Manufacturing Company (TSMC), and Advanced Semiconductor Materials (ASM), promises to improve the reliability and performance of modern electronics, from smartphones to artificial intelligence systems.

The Challenge of Chip Defects

As computer chips become increasingly miniaturized, with transistor channels now only about 15 to 18 atoms wide, even tiny imperfections can significantly disrupt electron flow and compromise performance. Identifying these defects has been a major challenge for the semiconductor industry. Traditional imaging methods lacked the resolution needed to pinpoint the exact location and nature of these atomic flaws.

Electron Ptychography: A New Level of Detail

Electron ptychography overcomes this limitation by using a sophisticated computational imaging method. It employs an electron microscope pixel array detector (EMPAD) to collect detailed scattering patterns of electrons as they pass through the transistor structures. By analyzing how these patterns change with slight shifts in position, scientists can reconstruct an image with unprecedented clarity, achieving sub-Angström resolution. Cornell University News

“Mouse Bite” Defects and Strain Relaxation

Using this technique, researchers discovered small imperfections dubbed “mouse bites” at the interfaces within the transistor channels. These defects arise during the complex manufacturing process. Further analysis revealed that silicon atoms in the 5-nanometer-thick channel relax away from the interfaces, with only approximately 60% of atoms remaining in a bulk-like structure. Nature Communications

Collaboration and Funding

The development of this imaging method was a collaborative effort involving Cornell University, TSMC, and ASM. The research was funded by TSMC, highlighting the industry’s commitment to advancing semiconductor metrology. ScienceDaily

Implications for the Future of Electronics

This new capability has significant implications for the future of electronics. It provides a direct probe to understand the impact of each manufacturing step, enabling more effective debugging and fault-finding, particularly during the development stage. The ability to quantify roughness, strain, and defects at the atomic level will also aid in device modeling and process development. PubMed

Data Availability

The experimental datasets used in this study are publicly available on Zenodo at https://doi.org/10.5281/zenodo.1588244377, promoting further research and collaboration in the field.