Surface roughness of silicon wafers on different lateral length scales

We measured the surface roughness of three unpatterned Si wafers by four different instruments: atomic force microscope, wafer inspection station (based on light scattering), Nomarski optical microscope, and interferometric profiler. The root-mean-square surface roughness (R sub(rms)) values vary be...

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Veröffentlicht in:Journal of the Electrochemical Society 1993-05, Vol.140 (5), p.L75-L77
Hauptverfasser: MALIK, I. J, PIROOZ, S, SHIVE, L. W, DAVENPORT, A. J, VITUS, C. M
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container_end_page L77
container_issue 5
container_start_page L75
container_title Journal of the Electrochemical Society
container_volume 140
creator MALIK, I. J
PIROOZ, S
SHIVE, L. W
DAVENPORT, A. J
VITUS, C. M
description We measured the surface roughness of three unpatterned Si wafers by four different instruments: atomic force microscope, wafer inspection station (based on light scattering), Nomarski optical microscope, and interferometric profiler. The root-mean-square surface roughness (R sub(rms)) values vary between 1.2 angstroms as measured by an atomic force microscope over a 1x1 mu m area to 19.4 angstroms as measured by an interferometric profiler over a 1.32 mm path length. To explain the observation that samples showing high roughness values when measured with one technique but low when measured with another technique, we discuss the lateral (within the surface plane) characteristics of the different methods and show that the experimental results are not contradictory. We suggest that a parameter describing the lateral properties of a surface roughness measurement technique should be included when reporting surface roughness data.
doi_str_mv 10.1149/1.2221500
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subjects Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
title Surface roughness of silicon wafers on different lateral length scales
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