IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on VLSI Design and CAD Algorithms
Accurate Systematic Hot-Spot Scoring Method and Score-Based Fixing Guidance Generation
Yonghee PARKJunghoe CHOIJisuk HONGSanghoon LEEMoonhyun YOOJundong CHO
Author information
JOURNAL RESTRICTED ACCESS

2009 Volume E92.A Issue 12 Pages 3082-3085

Details
Abstract

The researches on predicting and removing of lithographic hot-spots have been prevalent in recent semiconductor industries, and known to be one of the most difficult challenges to achieve high quality detection coverage. To provide physical design implementation with designer's favors on fixing hot-spots, in this paper, we present a noble and accurate hot-spot detection method, so-called “leveling and scoring” algorithm based on weighted combination of image quality parameters (i.e., normalized image log-slope (NILS), mask error enhancement factor (MEEF), and depth of focus (DOF)) from lithography simulation. In our algorithm, firstly, hot-spot scoring function considering severity level is calibrated with process window qualification, and then least-square regression method is used to calibrate weighting coefficients for each image quality parameter. In this way, after we obtain the scoring function with wafer results, our method can be applied to future designs of using the same process. Using this calibrated scoring function, we can successfully generate fixing guidance and rule to detect hot-spot area by locating edge bias value which leads to a hot-spot-free score level. Finally, we integrate the hot-spot fixing guidance information into layout editor to facilitate the user-favorable design environment. Applying our method to memory devices of 60nm node and below, we could successfully attain sufficient process window margin to yield high mass production.

Content from these authors
© 2009 The Institute of Electronics, Information and Communication Engineers
Previous article Next article
feedback
Top