Optical Film Thickness & Wafer-Mapping (Filmetrics F50)
This tool is for thickness and optical property measurements of films on substrates, including mapping of thin-films on full wafers. The technique used is white light reflection. Data is taken with normal incidence reflection of white light from the surface using a Deuterium (UV) and Halogen (Vis-nIR) lamps.
The motorized stage automatically acquires optical reflection spectra at programmed points across the wafer. At each point, the reflection spectrum is baselines, and the reflection data is modeled at each point, and finally the optical parameters (thickness/refractive index/absorption) are adjusted to give a best least-squared fit to the data. The accuracy of the technique will depend on the thickness of the film and the optical models used for the fitting of the data. For a more complete description go to Filmetrics.
- 190-1100 nm reflection spectrum
- Deuterium (UV) and Halogen (Vis-nIR) light sources
- 10 Å to 150 µm thickness, n, and k measurements
- Motorized mapping on wafers up to 150mm.
- Small substrates also possible, ≥ 2-3mm
- Approx. 1-2mm measurment spot size area
- Best for unpatterned samples.
- Spectrum Data can be exported
- Can model up to three layers with accuracy