Kla Tencor Corporation

Joseph M Blecher

Carl Hess

Yalin Xiong

Mark Joseph Wihl

Bing Li

Chun Guan

Weimin Ma

Robert A Comstock

A reticle that is within specifications is inspected to generate baseline candidate defects and their location and size. After using the reticle in photolithography, the reticle is inspected to generate current candidate defects and their location and size. An inspection report of filtered candidate defects and their images is generated so that these candidate defects include a first subset of the current candidate defects and their images and exclude a second subset of the current candidate defects and their images. Each of the first subset of candidate defects has a location and size that fails to match any baseline candidate defect's location and size, and each of the excluded second subset of candidate defects has a location and size that matches a baseline candidate defect's location and size.

Monitoring changes in photomask defectivity

A reticle that is within specifications is inspected so as to generate a baseline event indicating a location and a size value for each unusual reticle feature. After using the reticle in photolithography, the reticle is inspected so as to generate a current event indicating a location and a size value for each unusual reticle feature. An inspection report of candidate defects and their images is generated so that these candidate defects include a first subset of the current events and their corresponding candidate defect images and exclude a second subset of the current events and their corresponding excluded images. Each of the first included events has a location and size value that fails to match any baseline event's location and size value, and each of the excluded second events has a location and size value that matches a baseline event's location and size value.

Disclosed are methods and apparatus for inspecting a photolithographic reticle. A stream of defect data is received from a reticle inspection system, wherein the defect data identifies a plurality of defects that were detected for a plurality of different portions of the reticle. Before reviewing the defect data to determine whether the reticle passes inspection and as the stream of defect data continues to be received, some of the defects are automatically grouped with other most recently one or more received defects so as form groups of substantially matching defects. Before reviewing the defect data to determine whether the reticle passes inspection and after all of the defect data for the reticle is received, one or more of the groups of defects that have a number above a predetermined threshold are automatically filtered from the defect data so as to form filtered defect data. The filtered defect data may then be provided to a review station for determining whether the reticle passes.

Reticle defect inspection with systematic defect filter

A stream of defect data is received from a reticle inspection system. The defect data identifies defects that were detected for a plurality of different portions of a reticle. Before reviewing the defect data to determine whether the reticle passes inspection and as the stream of defect data continues to be received, some of the defects are automatically grouped with other most recently one or more received defects so as to form groups of substantially matching defects. Before reviewing the defect data to determine whether the reticle passes inspection and after all of the defect data for the reticle is received, one or more of the groups of defects that have a number above a predetermined threshold are automatically filtered from the defect data so as to form filtered defect data. The filtered defect data may then be provided to a review station for determining whether the reticle passes.

A computing system having at least one cluster. Each cluster has only one master server. The master server has at least one general processing unit, a relatively high speed data input adapted to send and receive data, a relatively low speed data input adapted to send and receive data, and a buffer memory adapted to buffer data between the relatively high speed data input and the relatively low speed data input. Each cluster also has at least one slave server, which has at least one general processing unit, and a relatively low speed data input adapted to send and receive data, the relatively low speed data input having data communication with the relatively low speed data input of the master server. In this manner, the relatively high speed data input, which tends to be very expensive, is present only in the master server, and is used for the high speed transfer of large amounts of data. However, the master server sends the data out to the slave servers on lower speed connections. Thus, there is a blend of both high speed and low speed data communication within the system, and the data is economically processed in clusters within the system.

Blade server interconnection

The above and other needs are met by an inspection system having a sensor array that is connected to a high speed network connection, and is adapted to provide image data in regard to images of a substrate. A process node is also connected to the high speed network connection, and is adapted to received the image data over the high speed network connection and to analyze the image data to detect anomalies in the images. In this manner, commercially available hardware can be used to construct the inspection system, which thus overcomes many of the problems with expensive, unreliable, and inflexible prior art inspection systems.

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San Jose, CA, United States of America

Joseph M Blecher