Measurements of Thermal Resistance Across Buried Interfaces with Frequency-Domain Thermoreflectance and Microscale Confinement.

ABSTRACT: Confined geometries are used to increase measurement sensitivity to thermal boundary resistance at buried SiO₂ interfaces with frequency-domain thermoreflectance (FDTR). We show that radial confinement of the transducer film and additional underlying material layers prevents heat from spreading and increases the thermal penetration depth of the thermal wave. Parametric analyses are performed with finite element methods and used to examine the extent to which the thermal penetration depth increases as a function of a material's effective thermal resistance and the degree of material confinement relative to the pump beam diameter. To our surprise, results suggest that the measurement technique is not always the most sensitive to the largest thermal resistor in a multilayer materia

SUBMITTER: Warzoha RJ 

PROVIDER: S-EPMC11310922 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature