PROXIMITY EFFECT CORRECTION IN ELECTRON BEAM LITHOGRAPHY
First Claim
1. A method of generating a layout pattern, comprising:
- determining a first energy density indirectly exposed to a first feature of one or more features of a layout pattern on an energy-sensitive material when the one or more features of the layout pattern in the energy-sensitive material are directly exposed by a charged particle beam; and
adjusting a second energy density exposed to the first feature when the first feature is directly exposed by the charged particle beam, so that a total energy density received by the first feature is a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure, and the total energy density is maintained at about a threshold energy level to fully expose the first feature in the energy-sensitive material.
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Abstract
A method of generating a layout pattern includes determining a first energy density indirectly exposed to a first feature of one or more features of a layout pattern on an energy-sensitive material when the one or more features of the layout pattern on the energy-sensitive material are directly exposed by a charged particle beam. The method also includes adjusting a second energy density exposed the first feature when the first feature is directly exposed by the charged particle beam. A total energy density of the first feature that comprises a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure is maintained at about a threshold energy level to fully expose the first feature in the energy-sensitive material.
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Citations
20 Claims
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1. A method of generating a layout pattern, comprising:
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determining a first energy density indirectly exposed to a first feature of one or more features of a layout pattern on an energy-sensitive material when the one or more features of the layout pattern in the energy-sensitive material are directly exposed by a charged particle beam; and adjusting a second energy density exposed to the first feature when the first feature is directly exposed by the charged particle beam, so that a total energy density received by the first feature is a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure, and the total energy density is maintained at about a threshold energy level to fully expose the first feature in the energy-sensitive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of generating a layout pattern, comprising:
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obtaining a layout pattern comprising one or more features to be generated on an energy-sensitive material on a work piece; obtaining information of the energy-sensitive material; determining a first energy density indirectly exposed to a first feature of the one or more features of the layout pattern in the energy-sensitive material when the one or more features of the layout pattern in the energy-sensitive material are directly exposed by a charged particle beam; determining a second energy density of the first feature when the first feature is directly exposed by the charged particle beam; maintaining a total energy density of the first feature that is a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure at about a threshold energy level that is, based on the information of the energy-sensitive material at a lowest energy density that fully exposes the energy-sensitive material; and directly exposing the first feature of the layout pattern by the charged particle beam to the second energy density. - View Dependent Claims (14, 15)
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16. A control system for generating a layout pattern on an energy-sensitive material, comprising:
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a main controller; and an analyzer module coupled to the main controller, wherein the analyzer module is configured to receive a layout pattern comprising one or more features and information of the energy-sensitive material, wherein the layout pattern is produced by a charged particle beam in the energy-sensitive material on a work piece, and wherein the analyzer module is configured to; determine a first energy density indirectly exposed to a first feature of the one or more features of the layout pattern in the energy-sensitive material when the one or more features of the layout pattern in the energy-sensitive material are directly exposed by the charged particle beam; adjust a second energy density of the first feature when the first feature is directly exposed by the charged particle beam, wherein a total energy density of the first feature that is a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure, and the total energy density is maintained at about a threshold energy level that is a lowest energy density that fully exposes the energy-sensitive material; and generate a set of commands that comprises one or more timings and one or more deflection angles for the main controller to control the charged particle beam to directly expose the first feature of the layout pattern to the second energy density. - View Dependent Claims (17, 18, 19, 20)
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Specification