Direction Indicators for Asymmetric Halo Implant Verification
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Solution Overview
Problem
Current methods for verifying the correct orientation of asymmetric halo implants in integrated circuit manufacturing are slow and difficult, lacking the ability to verify orientation in the manufacturing process, which increases cycle time and complexity.
Innovation Solution
Incorporating direction indicators on masks and integrated circuits, such as asymmetrical shapes or symbols, to visually or metrologically determine the orientation of implant directions, allowing for accurate alignment and verification during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If verification of IP block orientation is performed by checking each step in the design data flow, then orientation accuracy can be maintained, but cycle time increases and the process becomes more difficult
Solution Approach 1:
The patent applies preliminary action by incorporating orientation indicators directly into the mask design and manufacturing process. Instead of verifying orientation after multiple design steps, the indicators are prepared in advance as part of the mask pattern, enabling direct visual or automated verification during manufacturing without requiring retrospective analysis of the entire design data flow.
Solution Approach 2:
The patent introduces orientation indicators as intermediary structures that mediate between the design intent and manufacturing execution. These indicators serve as visual or metrological intermediaries that convey orientation information from the design stage through to the manufacturing stage, eliminating the need for complex data flow analysis and enabling direct verification.
2Manufacturing precision
If existing structures like alignment keys and critical dimension bars are used on masks, then dimensional and overlay control is achieved, but orientation verification capability is not provided
Solution Approach 1:
The patent applies asymmetry by designing orientation indicators with asymmetric geometric features that encode directional information. Unlike symmetric alignment keys that only provide positional reference, the asymmetric indicators have distinct orientations that visually or metrologically indicate the intended implant direction, thereby conveying orientation information that was previously lost.
Solution Approach 2:
The patent achieves multi-functionality by designing indicators that simultaneously provide alignment reference and orientation verification. The same structural features that enable dimensional and overlay control also encode orientation information, eliminating the need for separate verification structures and reducing mask complexity.
3Reliability
If asymmetric halo implants are performed to increase device performance, then device performance improves, but verification of correct orientation becomes more critical and complex
Solution Approach 1:
The patent applies self-service by designing the mask and manufacturing process to automatically provide orientation verification through the embedded indicators. The manufacturing process itself generates the verification information through the formation of indicator structures, eliminating the need for external or post-process verification activities and reducing overall process complexity.
Data Source
AI summary
An integrated circuit includes a visually discernable indicator formed as part of the integrated circuit to indicate a directionality of a non-visually discernable characteristic of the integrated circuit.