CONTACT OR VIA CRITICAL DIMENSION CONTROL WITH NOVEL CLOSED LOOP CONTROL SYSTEM IN CHEMICAL MECHANICAL PLANARIZATION PROCESS
First Claim
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1. A system for finishing a wafer comprising:
- a control model;
a finishing tool; and
at least one metrological device,wherein the control model receives a property attribute of the wafer measured by the at least one metrological device and determines at least one control parameter of the finishing tool.
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Abstract
Closed loop control may be used to improve uniformity of contact or via critical dimension using chemical mechanical planarization. For example, real-time closed loop control may be used to adjust oxide buffing or over-polishing time in a chemical mechanical planarization process to more uniformly and consistently achieve a target critical dimension of a semiconductor wafer.
10 Citations
20 Claims
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1. A system for finishing a wafer comprising:
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a control model; a finishing tool; and at least one metrological device, wherein the control model receives a property attribute of the wafer measured by the at least one metrological device and determines at least one control parameter of the finishing tool. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for finishing a wafer, comprising:
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specifying a target of a property attribute for the wafer; determining at least one control parameter for a finishing tool using a control model provided with the target of the property attribute; setting the at least one control parameter for the finishing tool; and finishing the wafer using the finishing tool. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A wafer for a semiconductor prepared by a process comprising:
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specifying a target of a property attribute for the wafer; determining at least one control parameter for a finishing tool using a control model provided with the target of the property attribute; setting the at least one control parameter for the finishing tool; and finishing the wafer using the finishing tool. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification