OVERLAY OPTICAL METROLOGY SYSTEMS COMPRISED

Brand Owner Address Description
NANOOCS Nanometrics Incorporated 1550 Buckeye Drive Milpitas CA 95035 Overlay optical metrology systems comprised of measurement optics, wafer handling mechanisms and system control hardware and software for measuring the difference between two nearly coincident patterns on a sample, such as a semiconductor wafer, which patterns are formed by a process such as photolithography, and which patterns are overlaid, one on top of the other and the overlay difference or error may be fed back to the exposure system that created the patterns so that this difference may be corrected on future exposures;
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. The optimization of an optical metrology model for use in measuring a wafer structure is evaluated. An optical metrology model having metrology model variables, which includes profile model parameters of a profile model, is developed. One or more goals for metrology model optimization are selected. One or more profile model parameters to be used in evaluating the one or more selected goals are selected. One or more metrology model variables to be set to fixed values are selected. One or more selected metrology model variables are set to fixed values. One or more termination criteria for the one or more selected goals are set. The optical metrology model is optimized using the fixed values for the one or more selected metrology model variables. Measurements for the one or more selected profile model parameters are obtained using the optimized optical metrology model. A determination is then made as to whether the one or more termination criteria are met by the obtained measurements.