Meaning
An advanced measurement technique uses high-intensity radiation to probe the internal structure of crystalline materials at the micron scale. Applying synchrotron microdiffraction reveals the directions of grain growth and the presence of hidden mechanical stresses within a chip. Because the beam is sourced from a particle accelerator, it carries much higher energy than a standard lab instrument.
Researchers must transport their samples to specialized national facilities to access this equipment.
Beam Focus
Optical lenses concentrate the X-rays into a point smaller than the average metal grain size. Through synchrotron microdiffraction, it is possible to generate a map of lattice orientations across an entire silicon bridge. The focus allows for individual assessment of the stress state in each separate crystal.
Lattice Strain
Shifts in the diffraction pattern indicate if the atomic grid is being compressed or stretched. Quantifying with synchrotron microdiffraction provides a numerical value for the pressure applied by packaging resins. These data points help engineers adjust their material formulas to prevent cracking over time.
Sample Orientation
Data is collected by rotating the specimen through a series of exact angles during exposure. Final output for synchrotron microdiffraction includes a database of coordinates and local strain vectors. Results are verified by comparing the shifts to an unstrained reference crystal kept in the same chamber.
