Evaluation of methods for noise-free measurement of LER/LWR using synthesized CD-SEM images

Vassilios Constantoudis; Erwine Pargon

doi:10.1117/12.2018245

10 April 2013 Evaluation of methods for noise-free measurement of LER/LWR using synthesized CD-SEM images

Proceedings Volume 8681, Metrology, Inspection, and Process Control for Microlithography XXVII; 86812L (2013) https://doi.org/10.1117/12.2018245
Event: SPIE Advanced Lithography, 2013, San Jose, California, United States

Abstract

The aim of this paper is to contribute to the understanding of the effects of noise on LER/LWR parameters when they are measured through the analysis of top-down CD-SEM images. To this end, first we present a methodology for the generation of synthesized CD-SEM images including resist lines with predetermined CD/pitch and LER/LWR parameters in which the noise level can be tuned at will. The sources of noise can be the shot noise of SEM electron beam (Poisson-type) and the microscope electronics (Gaussian-type). Then we use the generated CD-SEM images to evaluate three methods devised for the reduction of noise effects and the extraction of noise-free LER/LWR parameters. The first method (called fractal method) is presented for first time while the next two (model filtering and Power Spectral Density) have been already proposed and applied in literature. We compare the output of each method with the noise-less LER/LWR parameters for various noise levels, number of images and LER/LWR initial parameters and discuss their advantages and limitations.

Citation Download Citation

Vassilios Constantoudis and Erwine Pargon "Evaluation of methods for noise-free measurement of LER/LWR using synthesized CD-SEM images", Proc. SPIE 8681, Metrology, Inspection, and Process Control for Microlithography XXVII, 86812L (10 April 2013); https://doi.org/10.1117/12.2018245

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available