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New NIST measurement tool is on target for the fast-growing MEMS industry
by Staff Writers
Washington DC (SPX) May 09, 2013


New NIST Reference Materials for MEMS devices are micromachined and further processed to contain miniature cantilevers, beams, stair-like step heights, microscale rulers and test structures for measuring surface-layer thickness. On the left is RM 8096, which was manufactured with an integrated circuit process; on the left is RM 8097, made with a MEMS process. Credit: NIST.

As markets for miniature, hybrid machines known as MEMS grow and diversify, the National Institute of Standards and Technology (NIST) has introduced a long-awaited measurement tool that will help growing numbers of device designers, manufacturers and customers to see eye to eye on eight dimensional and material property measurements that are key to device performance.

The NIST-developed test chips (Reference Materials 8096 and 8097) are quality assurance tools that enable accurate, reliable comparisons of measurements on MEMS (MicroElectroMechanical Systems) devices made with different equipment and by different labs or companies. These capabilities will make it easier to characterize and troubleshoot processes, calibrate instruments and communicate among partners.

MEMS were once considered a stepchild of the semiconductor industry and largely confined to automotive uses-primarily as accelerometers in airbag systems. But the devices have branched out into an array of applications, especially in consumer electronics markets.

A high-end smart phone, for example, contains about 10 such devices, including microphones, accelerometers and gyroscopes. MEMS devices also are important components of tablet computers, game consoles, lab-on-a-chip diagnostic systems, displays and implantable medical devices.

Global MEMS industry revenues are projected to grow from about $10 billion in 2011 to $21 billion in 2017, according to the June 2012 forecast by the technology consulting firm Yole Developpement.

Widely used reference materials and standardized measurement methods can help to improve process efficiency and to reduce the cost and time devoted to testing and inspecting MEMS devices. Industry-accepted measurements also can promote greater interoperability among devices made by different manufacturers.

The new NIST reference materials are micromachined and further processed to contain miniature cantilevers, beams, stair-like step heights, microscale rulers and test structures for measuring surface-layer thickness.

Specifically, the NIST test chips can be used to check customer conformity with internationally established standards for measuring elasticity (Young's modulus), residual strain (and stress), strain (and stress) gradient, as well as thickness, step height and length.

All dimensional and material-property measurements that NIST used to characterize the reference devices conform with SEMI and ASTM International standard test methods. These standard methods are consensus best practices developed by industry committees.

"Reference materials and best-practice test methods provide industry-wide benefits," explains NIST electronics engineer Janet Cassard.

"Typically, these tools are prohibitively expensive for a single company to develop on its own. We will work with the MEMS community to facilitate widespread adoption and consistent usage of these standard test methods and reference materials."

One test chip (RM 8096) is manufactured in an integrated circuit (IC) process; the other (RM 8097) in a MEMS process. The test chips are supported by a user's guide, data analysis sheets for each measurement, and other materials accessible via the NIST Data Gateway with the keyword "MEMS Calculator."

For more information, go here.

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Related Links
National Institute of Standards and Technology (NIST)
Computer Chip Architecture, Technology and Manufacture
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