Abstract:
PROBLEM TO BE SOLVED: To provide the method of measuring information provided by a substrate. SOLUTION: This substrate comprises feature formed by lithography equipment. This method comprises the steps of projecting light beam on a marker arranged in upper part of and/or near the feature on the substrate, and detecting information provided by this marker using a sensor. Coating is arranged on the substrate. Therefore, when this coating is between the light beam and the feature, the light beam is protected from substantially becoming cause of reading incorrectly information provided by the marker by being reflected. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system for performing a focus test in a lithographic apparatus. SOLUTION: In the method, a substrate includes a layer of a radiation photosensitive material, the substrate is illuminated in the lithographic apparatus by a first focus sensitive feature and a second focus feature, and the substrate is analyzed to provide results of a focus test by the first focus sensitive feature imaged on the substrate. The focus test is performed on a regularly manufactured wafer. When a prescribed statistical characteristic related to the second focus feature imaged on the substrate is entered into a prescribed limit or only when the prescribed statistical characteristic enters into the prescribed limit, the results of the focus test are accepted. The second focus feature may be a focus sensitive feature or a focus insensitive feature. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
A method for measuring information provided by a substrate (W) is disclosed. The substrate (W) includes a feature (300) that has been created by a lithographic apparatus. The method includes projecting a beam of light (100) onto a marker (200) disposed above and/or near the feature (300) on the substrate (W), and detecting information provided by the marker (200) with a sensor. A coating (330) is disposed on the substrate (W) so that the coating (330) lies between the beam of light (100) and the feature (300) to substantially prevent the beam of light (100) from being reflected by the feature (300) and causing an inaccurate readout of the information provided by the marker (200).