Abstract:
PROBLEM TO BE SOLVED: To provide a lithography device capable of predicting displacement of each point of a substrate more accurately.SOLUTION: There is provided a method of estimating a value representing a level of alignment mark deformation on a substrate using an alignment system including an alignment sensor system capable of emitting light of various measurement frequency so that the light is reflected by an alignment mark and detecting a diffraction pattern formed with reflected light so as to measure the alignment position of the alignment mark on a substrate having been processed. The method includes measuring an alignment position deviation from an expected predetermined alignment position of the alignment mark for each of alignment marks related to two or more measurement frequencies by using the two or more measurement frequencies, and finding a value representing a spread of the alignment position deviation for each alignment mark so as to estimate a level of alignment mark deformation.
Abstract:
PROBLEM TO BE SOLVED: To provide an alignment arrangement and an alignment method which reduce influences of change by marks. SOLUTION: The alignment measurement arrangement includes a light source, an optical system and a detector. The light source generates a radiation beam with a plurality of wavelength ranges. The optical system receives the radiation beam, produces an alignment beam, directs the alignment beam to a mark located on an object, receives alignment radiation back from the mark, and transmits the received radiation. The detector receives the alignment radiation, detects an image of the alignment mark and outputs a plurality of alignment signals (r) each associated with one of the wavelength ranges. A processor, in communication with the detector, receives the alignment signals, determines signal qualities of the alignment signals, determines aligned positions of the alignment signals, and calculates a position of the alignment mark based on the signal qualities, aligned positions, and a model relating the aligned position to the range of wavelengths and mark characteristics, including mark depth and mark asymmetry. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic apparatus having excellent alignment reproducibility. SOLUTION: A method for manufacturing the device includes providing a substrate, the substrate including a plurality of exposure fields, each exposure field including one or more target portions and at least one mark structure, the mark structure being arranged as positional mark for the exposure field; scanning and measuring the mark of each exposure field to obtain alignment information for the respective corresponding exposure fields; determining an absolute position of each exposure field from the alignment information for the respective corresponding exposure fields; determining a relative position of each exposure field with respect to at least one other exposure field by use of additional information on the relative parameters of the exposure field and the at least one other exposure field relative to each other; and combining the absolute positions and the determined relative positions into improved absolute positions for each of the plurality of exposure fields. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an alignment determination system for determining an alignment target on an object that is the alignment determination system capable of providing a better signal to noise ratio.SOLUTION: The present invention provides an alignment determination system for determining an alignment target on an object. The alignment determination system comprises: a lighting source which provides a determining beam towards an object; a detector system which receives the determining beam after being reflected on the object; and a processing unit which determines the alignment based on the determining beam received by the detector system. The determination system comprises: a beam division device; and a polarizing device which polarizes a first beam part and/or a second beam part, or changes the polarization. A polarization angle of the first beam part acquired as a result differs from a polarization angle of the second beam part acquired as a result. The processing unit is configured so as to determine the alignment based on a signal including comparison between the polarized first beam part and the polarized second beam part.
Abstract:
PROBLEM TO BE SOLVED: To provide a metrological method capable of measuring particularly CD and overlay among a number of parameters by using a sensor of a type normally used for position measurements in a lithographic apparatus itself.SOLUTION: A pattern includes first and second sub-patterns 312 and 316, mutually adjacently positioned on a substrate, and having a first and a second periodicity respectively. The pattern is observed and a combined signal is obtained, which contains a beat component having a third periodicity at a frequency lower than frequencies of the first and the second periodicity. A measured value of lithographic process performance is obtained by referring to a phase of the beat component. The measurement can be carried out by using an existing alignment sensor of a lithographic apparatus. Sensitivity and accuracy of the measurement can be adjusted by selection of the first and the second periodicity, and therefore the third periodicity.
Abstract:
PROBLEM TO BE SOLVED: To provide an alignment determination system for determining an alignment target on an object that is the alignment determination system capable of providing a better signal to noise ratio.SOLUTION: The present invention provides an alignment determination system for determining an alignment target on an object. The alignment determination system comprises: a lighting source which provides a determining beam towards an object; a detector system which receives the determining beam after being reflected on the object; and a processing unit which determines the alignment based on the determining beam received by the detector system. The determination system comprises: a beam division device; and a polarizing device which polarizes a first beam part and/or a second beam part, or changes the polarization. A polarization angle of the first beam part acquired as a result differs from a polarization angle of the second beam part acquired as a result. The processing unit is configured so as to determine the alignment based on a signal including comparison between the polarized first beam part and the polarized second beam part.