ASTM F1894-98(2011)
Test Method for Quantifying Tungsten Silicide Semiconductor Process Films for Composition and Thickness
- Standard No.
- ASTM F1894-98(2011)
- Release Date
- 1998
- Published By
- American Society for Testing and Materials (ASTM)
- Latest
- ASTM F1894-98(2011)
- Replace By
- ANSI/UL 746B-2013
- Scope
This test method can be used to ensure absolute reproducibility of WSix film deposition systems over the course of many months. The time span of measurements is essentially the life of many process deposition systems.
This test method can be used to qualify new WSix deposition systems to ensure duplicability of existing systems. This test method is essential for the coordination of global semiconductor fabrication operations using different analytical services. This test method allows samples from various deposition systems to be analyzed at different sites and times.
This test method is the chosen calibration technique for a variety of analytical techniques, including, but not limited to:
Electron spectroscopy for chemical analysis (ESCA or XPS),
Auger electron spectroscopy (AES),
Fourier transform infrared red spectroscopy (FTIR),
Secondary ion mass spectrometry (SIMS), and
Electron dispersive spectrometry (EDS) and particle induced x-ray emission (PIXE).
1.1 This test method covers the quantitative determination of tungsten and silicon concentrations in tungsten/silicon (WSix) semiconductor process films using Rutherford Backscattering Spectrometry (RBS). (1) This test method also covers the detection and quantification of impurities in the mass range from phosphorus ?/span> (31 atomic mass units (amu) to antimony (122 amu).
1.2 This test method can be used for tungsten silicide films prepared by any deposition or annealing processes, or both. The film must be a uniform film with an areal coverage greater than the incident ion beam (8764;2.5 mm).
1.3 This test method accurately measures the following film properties: silicon/tungsten ratio and variations with depth, tungsten depth profile throughout film, WSix film thickness, argon concentrations (if present), presence of oxide on surface of WSix films, and transition metal impurities to detection limits of 1×1014 atoms/cm2.
1.4 This test method can detect absolute differences in silicon and tungsten concentrations of ±3 and ±1 atomic percent, respectively, measured from different samples in separate analyses. Relative variations in the tungsten concentration in depth can be detected to ±0.2 atomic percent with a depth resolution of ±70?/span>.
1.5 This test method supports and assists in qualifying WSix films by electrical resistivity techniques.
1.6 This test method can be performed for WSix films deposited on conducting or insulating substrates.
1.7 This test method is useful for WSix films between 20 and 400 nm with an areal coverage of greater than 1 by 1 mm2.
1.8 This test method is non-destructive to the film to the extent of sputtering.
1.9 A statistical process control (SPC) of WSix films has been monitored since 1993 with reproducibility to ±4 %.
1.10 This test method produces accurate film thicknesses by modeling the film density of the WSix film as WSi2 (hexagonal) plus excess elemental Si2. The measured film thickness is a lower limit to the actual film thickness with an accuracy less than 10 % compared to SEM cross-section measurements (see 13.4).
1.11 This test method can be used to analyze films on whole wafers up to 300 mm without breaking the wafers. The sites that can be ......
ASTM F1894-98(2011) Referenced Document
- ASTM E1241 Standard Guide for Conducting Early Life-Stage Toxicity Tests with Fishes*， 2004-04-01 Update
- ASTM E673 Standard Terminology Relating to Surface Analysis
ASTM F1894-98(2011) history
- 1998 ASTM F1894-98(2011) Test Method for Quantifying Tungsten Silicide Semiconductor Process Films for Composition and Thickness
- 1998 ASTM F1894-98(2003) Test Method for Quantifying Tungsten Silicide Semiconductor Process Films for Composition and Thickness
- 1998 ASTM F1894-98 Test Method for Quantifying Tungsten Silicide Semiconductor Process Films for Composition and Thickness
