IEC 62047-10:2011

Overview

IEC 62047-10:2011 is an international standard developed by the International Electrotechnical Commission (IEC) that defines a micro-pillar compression test method specifically designed for micro-electromechanical system (MEMS) materials. This standard details a precise technique to measure compressive properties such as the modulus of elasticity and yield strength of MEMS materials using micro-pillars fabricated on rigid substrates. Applicable to a variety of materials-including metallic, ceramic, and polymeric-IEC 62047-10 provides a reliable and repeatable means to evaluate mechanical performance at the microscale, which is critical for advanced semiconductor and MEMS device applications.

Key Topics

• Micro-Pillar Compression Principle
  The test involves applying uniaxial compressive force to a cylindrical micro-pillar, with stress defined as the applied force divided by the micro-pillar's cross-sectional area, and strain evaluated from the longitudinal displacement relative to pillar height.
• Specimen Design and Fabrication
  The micro-pillar test specimen-a cylindrical pillar with an aspect ratio (height to diameter) of at least 3-is micro-machined onto a stiff substrate. The shape and verticality of these pillars are verified using electron or optical microscopy to ensure accurate testing conditions.
• Accurate Dimensional Measurements
  Precise measurement of the micro-pillar's dimensions (diameter and height) is crucial for calculating mechanical properties. Techniques such as interferometry or focused ion beam (FIB) sectioning ensure dimensional accuracy within ±1%. If geometric deviations exist, finite element analysis may be employed to interpret results correctly.
• Testing Equipment and Setup
  The standard emphasizes high-resolution force and displacement sensors with resolutions better than 0.1% of the maximum expected values. Test actuators must provide linear movement aligned carefully to minimize errors due to tool-pillar misalignment.
• Error Considerations
  Errors may arise from friction between the compression punch and pillar, boundary conditions differing from bulk material tests, and inaccuracies in strain measurement. IEC 62047-10 discusses mitigating these errors by maintaining appropriate aspect ratios (preferably below 10 to avoid buckling) and minimizing frictional effects.

Applications

This standard is essential for engineers and researchers working on:

• MEMS Device Development
  Enables precise mechanical characterization of miniature components, ensuring device reliability and performance under mechanical load.
• Material Science and Characterization
  Provides fundamental compressive property data for thin films and microscale materials used in semiconductor and microelectronic applications.
• Quality Control in Semiconductor Manufacturing
  Assists in verifying material consistency and properties during fabrication processes for micro-electromechanical systems.
• Advanced Research in Microfabrication Techniques
  Supports development of novel microfabrication methods through rigorous mechanical testing standards.

Related Standards

• IEC 62047-8: Semiconductor devices – Micro-electromechanical devices – Part 8: Strip bending test method for tensile property measurement of thin films
  Complements IEC 62047-10 by providing standards for tensile testing of thin films used in MEMS, crucial for complete mechanical characterization.
• Other Parts of IEC 62047 Series
  The IEC 62047 series covers various test methods for MEMS materials to promote standardized testing for a wide range of mechanical properties.
• ISO/IEC Directives Part 2
  IEC 62047-10 adheres to ISO/IEC Directives for standardization processes ensuring consistency and international acceptance.

IEC 62047-10:2011 offers a scientifically rigorous and standardized approach to micro-pillar compression testing that supports high accuracy and repeatability, invaluable for advancing MEMS technology and semiconductor material characterization. By following this standard, laboratories and manufacturers can improve test efficiency, ensure comparability across studies, and facilitate innovation in micro-scale device engineering.