An instrumentation guide to measuring thermal conductivity using frequency domain thermoreflectance (FDTR)

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Frequency Domain Thermoreflectance (FDTR) is vital for measuring thermal properties of nanoscale materials relevant to microelectronics.
• Accurate thermal management in shrinking electronic components relies on understanding thermal transport at small length scales.
• Current FDTR instruments are often custom-built, posing challenges in construction, alignment, and maintenance for researchers.

Purpose of the Study:

• To provide a practical guide for constructing, aligning, and maintaining FDTR instrumentation.
• To increase the accessibility, replicability, and widespread adoption of FDTR for thermal property measurements.
• To share unpublished insights and institutional knowledge for accurate and repeatable FDTR measurements.

Main Methods:

• Detailed discussion of component selection, placement, and alignment procedures for FDTR instruments.
• Exploration of data collection parameters, common challenges, and automation efforts in FDTR measurements.
• Comparison of numerical integration methods and fitting approaches (e.g., Monte Carlo simulation) for data analysis and uncertainty quantification.

Main Results:

• The study offers practical, unpublished insights crucial for obtaining reliable thermal property measurements using FDTR.
• Comparative analysis demonstrates the reliability and relative speed of different data fitting and uncertainty analysis methods.
• The FDTR instrument was validated using substrates with known thermal properties, including silica, quartz, sapphire, and silicon.

Conclusions:

• This work serves as a practical resource to demystify FDTR instrumentation and improve measurement accuracy.
• The provided guidance and analysis methods facilitate broader adoption and reliable application of FDTR in thermal property characterization.
• The validated instrument and shared knowledge contribute to advancing thermal management solutions in microelectronics.