Interface-controlled thermal transport properties in nano-clustered phase change materials

Abstract

We measured the thermal conductivity of nano-clustered Ge 2 Sb 2 Te 5 (GST)-TiO x films in situ upon annealing from room temperature to 200 C by the time-domain thermoreflectance method. The nano-clustered structure was found to significantly reduce the thermal conductivity of the crystallized GST-TiO x films. The reduction is attributed to the thermal resistance provided by the TiO x boundaries, of which the impact is identified by estimating the apparent interfacial thermal conductance of the embedded GST/TiO x interfaces. We suggest how to deal with the electronic contribution to thermal transport for this procedure. The apparent interfacial thermal conductance of the embedded GST/TiO x interfaces was found to tune closer to the intrinsic value 30 MW/m 2 K as the microstructure of the films evolved into a distinctly clustered structure. V C 2012 American Institute of Physics. [http://dx.

A hierarchically encapsulated phase-change film with multi-stage heat management properties and conformable self-interfacing contacts for enhanced interface heat dissipation

“…Thus, PhC-TIMs have high potential to realize efficient cooling and precise temperature control of electronic devices by storage of instantaneous excessive heat, turning out to be promising candidates for thermal management applications, which have received extensive attention in recent years. 35–39 Solid–liquid organic phase change materials (PCMs) are desirable because of their outstanding stability, insignificant supercooling, and low cost. 40 However, PCM film materials are still extremely scarce nowadays.…”