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Higher Order Tip Effects in CD-AFM Linewidth Measurements



Ndubuisi G. Orji, Ronald G. Dixson


In critical dimension Atomic force microscopy (CD-AFM), a source of uncertainty is the tip.  Measurements made using a CD-AFM tip show an apparent broadening of the width. Usually the results can be approximated if the tip-width is known. In addition to tip-width, tip-shape dependent effects, also known as higher order tip effects, area contributor to the uncertainty of CD-AFM linewidth measurements, especially for undercut features and samples with relatively large sidewall roughness.  In this paper we examine the different types of CD-AFM higher order tip effects within the context of a reference measurement system and present a procedure for estimating for thiscontribution with an uncertainty of less than 1.5 nm
Measurement Science & Technology


atomic force microscope, linewidth, reference measurement system, tip effects, uncertainty


Orji, N. and Dixson, R. (2007), Higher Order Tip Effects in CD-AFM Linewidth Measurements, Measurement Science & Technology (Accessed April 16, 2024)
Created January 1, 2007, Updated February 19, 2017