L. Krusin-Elbaum, G. Blatter, et al.
Physica C: Superconductivity and its Applications
The authors present direct evidence for Te segregation to the grain boundaries in chalcogenide Ge2 Sb2 Te5 films by using transmission electron microscopy scans with a 0.5 nm diameter focused probe. This finding is consistent with the observed impeded grain growth and with the post-transition relief of a "spikelike" stress, fully to the pretransition level. Te motion shows up in void formation below 200 °C, a pileup of Te at the surface and its loss at higher (above 400 °C) temperatures. Tuning the driving force for this segregation may be key for the optimal phase-change material design. © 2007 American Institute of Physics.
L. Krusin-Elbaum, G. Blatter, et al.
Physica C: Superconductivity and its Applications
C. Cabral, J.M.E. Harper, et al.
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
D. López, L. Krusin-Elbaum, et al.
Physical Review Letters
G.A. Lucadamo, C. Lavoie, et al.
Materials Research Society Symposium - Proceedings