Sensitive test structure for assessing pattern anomalies

Abstract

A subset test module and associated methodology for utilizing the same are disclosed that facilitate identification of process drift in semiconductor fabrication processing. A test wafer having a plurality of die formed thereon has a plurality of test modules formed within the die. The plurality of test modules are substantially the same from die to die, and the respective modules similarly include a plurality of test structures that are substantially the same from module to module. Corresponding test structures within respective modules on different die are inspected and compared to one another to find structures that are sensitive to process drift. One or more structures that experience differences from module to module on different die are utilized to develop one or more test modules that can be selectively located within production wafers and monitored to determine whether process drift and / or one or more other aberrant processing conditions are occurring.

Description

FIELD OF INVENTION [0001] The present invention relates generally to semiconductor technologies and more particularly to a test structure and methodology for developing and utilizing the same to detect process drift and / or pattern anomalies in semiconductor processing. BACKGROUND OF THE INVENTION [0002] The widespread proliferation of computers and electronic devices is continually increasing as computers are consistently being used for different and more sophisticated applications. For example, the growth and use of digital media (e.g., digital audio, video, images, and the like) has expanded the use of computers, as well as the volume and complexity of functionality needed to be supported by these devices. Likewise, new and improved electronic devices (e.g., digital audio players, video players) are continually being developed and are placing new and ever increasing demands on the technology behind these devices. This growth and development has vastly increased the processing and ...

AI Technical Summary

Benefits of technology

This approach enables early detection of process drift and pattern anomalies, facilitating adjustments to maintain consistent processing conditions, thereby improving the reliability and performance of integrated circuits by identifying and mitigating registration errors and mis-patterning issues.

Problems solved by technology

Typically, in heat treatment operations, no additional material is added or removed from the wafer, although contaminants and vapors may evaporate from the wafer.

For example, registration error, mis-alignment, mis-patterning, or other pattern anomalies that can result from process drift or other undesirable processing conditions can compromise the performance of the structures and adversely affect resulting chip performance and reliability.

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