X-rays can be used to probe the repeating array of atoms that make up crystal structures; this is done through X-ray diffraction (XRD).
This technique gives researchers information not only about the geometry and size of these repeating structures, but also the quality, orientation and thickness of the films being probed. Being a non-destructive technique it can be used on the most precious of samples with high level of reproducibility.
When looking at thin films, the relative structure of both thin film and underlying material becomes important, with crystal structures of underlying materials sometimes dictating the geometric qualities of subsequent films. The impact of changing these parameters can manifest itself in many ways, from changes in chemical reactivity to electrical conductivity.
Thin films characterisation can prove problematic when looking at films under 5 nm thick, but the sensitivity of XRD gives the researcher capabilities to do so. XRD can also be used not only for single layer but also multiple layer analysis, observing these parameters for all layers simultaneously.
X-Ray Diffractometer (XRD) (optimised to measure thin films [e.g. 2nm to 10um])
- X-Ray tube power 3kW
- Incident optics (supporting parallel beam, Bragg-Brentano, mono-chromator, range of slits (Inc. Soller), pinhole configuration
- Goniometer, range of scanning modes (ϴ – 2ϴ, rocking curves, Omega 2-Theta, grazing incidence, X-Ray reflectivity
- Stage resolution < 10 mdeg
- Step size accuracy < 0.1 mdeg
- Goniometer range (minimum) (-5 to +85 deg)
- Degrees of freedom to include z, phi, chi (or equivalents)
- Detection optics, (range of slits (Inc. Soller))
- 1D detector with high dynamic range
- 0D detector
- In plane measurement capability
- Holding standard samples up to 50mm diameter
- Automated sample/X-ray alignment
- Z sample movement (> 45mm)
- Controlled Heating stage >1000°C (inert Atmosphere)
- Temperature control stage (-100°C to 350°C) (inert Atmosphere/Vacuum)
- Ability to measure air sensitive samples (>2 hours measurement time)
- Cabinet space to accommodate additional measurement equipment (e.g. 2 x Keithley 2400 sourcemeter or similar)
- Cabinet to provide additional AC power outlets for measurement equipment (DVM) and lead through capabilities (BNC connectors, USB etc.)
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