1 June 2011 Traceable calibration of a critical dimension atomic force microscope
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The National Institute of Standards and Technology (NIST) has a multifaceted program in atomic force microscope (AFM) dimensional metrology. One component of this effort is a custom in-house metrology AFM, called the calibrated AFM (C-AFM). The NIST C-AFM has displacement metrology for all three axes traceable to the 633 nm wavelength of the iodine-stabilized He-Ne laser. A second major component of this program, and the focus of this paper, is the use of critical dimension atomic force microscopy (CD-AFM). CD-AFM is a commercially available AFM technology that uses flared tips and twodimensional surface sensing to scan the sidewalls of near-vertical or even reentrant features. Features of this sort are commonly encountered in semiconductor manufacturing and other nanotechnology industries. NIST has experience in the calibration and characterization of CD-AFM instruments and in the development of uncertainty budgets for typical measurands in semiconductor manufacturing metrology. A third generation CD-AFM was recently installed at NIST. The current performance of this instrument for pitch and height measurements appears to support our relative expanded uncertainty (k = 2) goals in the range of 1.0 × 10-3 down to 1.0 × 10-4.
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Ronald Dixson, Ronald Dixson, Ndubuisi G. Orji, Ndubuisi G. Orji, Craig D. McGray, Craig D. McGray, Jon Geist, Jon Geist, } "Traceable calibration of a critical dimension atomic force microscope", Proc. SPIE 8036, Scanning Microscopies 2011: Advanced Microscopy Technologies for Defense, Homeland Security, Forensic, Life, Environmental, and Industrial Sciences, 80360S (1 June 2011); doi: 10.1117/12.887290; https://doi.org/10.1117/12.887290

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