Lithographic apparatus, excimer laser and device manufacturing method
First Claim
1. A lithographic apparatus comprising:
- a radiation system configured to condition a beam of electro-magnetic radiation having a spectral distribution of radiant intensity;
a support structure configured to support a patterning device, the patterning device serving to impart the beam of radiation with a pattern in its cross-section, the pattern having a feature;
a substrate table configured to hold a substrate;
a projection system configured to expose a radiation sensitive portion of the substrate to the patterned beam of radiation; and
a controller configured and arranged to provide an adjustment of said spectral distribution of radiant intensity based at least on data relating to exposure at a first focal position and exposure at a second focal position and representing a corresponding first printed size and second printed size of the feature.
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Accused Products
Abstract
A CD-pitch dependency for a lithographic pattern printing process is related to the spectral intensity distribution of radiation used for projecting the pattern. A CD-pitch dependency can vary from one system to another. This can result in an iso-dense bias mismatch between systems. The invention addresses this problem by providing a lithographic apparatus including an illumination system for providing a projection beam of radiation, a projection system for projecting a patterned beam onto a target portion of a substrate, and a substrate table for holding the substrate, with a controller to provide an adjustment of the spectral distribution of radiant intensity of the projection beam. The adjustment of the spectral intensity distribution is based on data relating to an iso dense bias, and includes a broadening of the spectral bandwidth or a change of shape of the spectral intensity distribution.
14 Citations
21 Claims
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1. A lithographic apparatus comprising:
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a radiation system configured to condition a beam of electro-magnetic radiation having a spectral distribution of radiant intensity; a support structure configured to support a patterning device, the patterning device serving to impart the beam of radiation with a pattern in its cross-section, the pattern having a feature; a substrate table configured to hold a substrate; a projection system configured to expose a radiation sensitive portion of the substrate to the patterned beam of radiation; and a controller configured and arranged to provide an adjustment of said spectral distribution of radiant intensity based at least on data relating to exposure at a first focal position and exposure at a second focal position and representing a corresponding first printed size and second printed size of the feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device manufacturing method comprising:
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providing a beam of electro-magnetic radiation having a spectral distribution of radiant intensity; patterning the beam of radiation with a pattern in its cross-section using a patterning device, the pattern having a feature; projecting the patterned beam of radiation to expose a radiation sensitive portion of a substrate; and adjusting said spectral distribution of radiant intensity at least in part in accordance with data relating to exposure at a first focal position and exposure at a second focal position and representing a corresponding first printed size and second printed size of the feature. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification