In a previous article [1], the Rayleigh criterion was mentioned as the resolution limit for the distance between two features. On the other hand, in a following article [2], the minimum pitch was mentioned for the resolution limit for arrayed features. In this article, we reconcile the two by considering gaps between arrayed features,… Read More
Author: Fred Chen
Lithography Resolution Limits – Arrayed Features
State-of-the-art chips will always include some portions which are memory arrays, which also happen to be the densest portions of the chip. Arrayed features are the main targets for lithography evaluation, as the feature pitch is well-defined, and is directly linked to the cost scaling (more features per wafer) from generation… Read More
Lithography Resolution Limits: Paired Features
As any semiconductor process advances to the next generation or “node”, a sticky point is how to achieve the required higher resolution. As noted in another article [1], multipatterning (the required use of repeated patterning steps for a particular feature) has been practiced already for many years, and many have… Read More
Low Energy Electrons Set the Limits for EUV Lithography
EUV lithography is widely perceived to be the obvious choice to replace DUV lithography due to the shorter wavelength(s) used. However, there’s a devil in the details, or a catch if you will.
Electrons have the last word
The resist exposure is completed by the release of electrons following the absorption of the EUV photon.… Read More
The Need for Low Pupil Fill in EUV Lithography
Extreme ultraviolet (EUV) lithography targets sub-20 nm resolution using a wavelength range of ~13.3-13.7 nm (with some light including DUV outside this band as well) and a reflective ring-field optics system. ASML has been refining the EUV tool platform, starting with the NXE:3300B, the very first platform with a numerical
A Forbidden Pitch Combination at Advanced Lithography Nodes
The current leading edge of advanced lithography nodes (e.g., “7nm” or “1Z nm”) features pitches (center-center distances between lines) in the range of 30-40 nm. Whether EUV (13.5 nm wavelength) or ArF (193 nm wavelength) lithography is used, one thing for certain is that the minimum imaged pitch … Read More
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