Contrast in terahertz conductivity of phase-change materials

Time-domain terahertz spectroscopy was used to study the dielectric and conductive properties of thin films of four phase-change materials: GeTe, GeSb2Te4, GeSbTe2, and AgInSbTe. Both amorphous and crystalline phases were studied, and the spectra were analyzed by a model including a harmonic oscillator and the Drude term. Spectra in the crystalline phase of AgInSbTe are dominated by free-carrier motion with a scattering time of 50 fs. In the Ge-containing compounds, we observed a phonon mode and a conductive contribution of free charge carriers with a much shorter scattering time. The conductivity appears to be linked to the distortions of the crystal unit cell from cubic symmetry.

► We use time-domain terahertz spectroscopy to study four phase-change materials.
► Complex transmittance of amorphous and crystallized thin films is measured.
► A model describing the permittivity and conductivity spectra is established.
► Weak oscillatory features in amorphous phases are attributed to short-range ordering.
► The marked contrast in conductivity appears proportional to local crystal distortions.