Phonon and electron transport through Ge2Sb2Te5 films and interfaces bounded by metals

Jaeho Lee, Elah Bozorg-Grayeli, SangBum Kim, Mehdi Asheghi, H.-S. Philip Wong, Kenneth E. Goodson
2013 Applied Physics Letters  
While atomic vibrations dominate thermal conduction in the amorphous and face-centered cubic phases of Ge 2 Sb 2 Te 5 , electrons dominate in the hexagonal closed-packed (hcp) phase. Here we separate the electron and phonon contributions to the interface and volume thermal resistances for the three phases using time-domain thermoreflectance and electrical contact resistance measurements. Even when electrons dominate film-normal volume conduction (i.e., 70% for the hcp phase), their contribution
more » ... their contribution to interface heat conduction is overwhelmed by phonons for high-quality interfaces with metallic TiN. V C 2013 AIP Publishing LLC. [http://dx.
doi:10.1063/1.4807141 fatcat:4kra2grihvapzbjcxf3ygseqae