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US08237914B2 Process, apparatus, and device for determining intra-field correction to correct overlay errors between overlapping patterns 有权
用于确定场内校正以校正重叠图案之间的重叠误差的过程,装置和设备

Process, apparatus, and device for determining intra-field correction to correct overlay errors between overlapping patterns
Abstract:
A lithographic apparatus includes an illumination system configured to condition a radiation beam, a support for a patterning device, a substrate table for a substrate, a projection system, and a control system. The patterning device is capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam. The projection system is configured to project the patterned radiation beam as an image onto a target portion of the substrate along a scan path. The scan path is defined by a trajectory in a scanning direction of an exposure field of the lithographic apparatus. The control system is coupled to the support, the substrate table and the projection system for controlling an action of the support, the substrate table and the projection system, respectively. The control system is configured to correct a local distortion of the image in a region along the scan path by a temporal adjustment of the image in that region, hereby reducing the intra-field overlay errors.
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