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15 February 1994 Monitoring of submicrometer linewidths using diffraction gratings
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For a typical fabrication facility, linewidth control is done after the patterning and etch processes by means of a scanning electron microscope (SEM). Several techniques using diffraction gratings have been proposed as in-line or in situ replacements for the SEM linewidth measurement. One such system was developed for use in the Microelectronics Manufacturing Science and Technology (MMST) mini- factory. The system used in the MMST factory was capable of measuring the critical dimensions needed for factory control. This critical dimension diffraction measurement system consists of optics and processing algorithms necessary to measure a series of gratings in an etch processor or directly after processing in a metrology chamber. The optics allow the measurement of a full diffraction pattern with one image. The processing algorithms convert this image to a list of diffraction orders and intensities for each grating in the set. These are then used by the pattern matching algorithms to determine grating linewidth.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Phillip Chapados Jr. "Monitoring of submicrometer linewidths using diffraction gratings", Proc. SPIE 2091, Microelectronic Processes, Sensors, and Controls, (15 February 1994);

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