Selective Optical Proximity Correction for Semiconductor Reticles
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Solution Overview
Problem
Current photolithography processes face challenges in maintaining pattern fidelity and resolution as feature sizes in integrated circuits approach the wavelength of light used, leading to optical distortion and pattern degradation, especially for features smaller than 1 micron.
Innovation Solution
The method involves selectively applying optical proximity correction (OPC) and resolution enhancement techniques (RET) to specific block areas within reticle patterns, rather than the entire pattern, to correct for distortion and enhance resolution, thereby reducing computational time and hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical proximity correction (OPC) and resolution enhancement techniques (RET) are applied to the entire reticle pattern, then pattern fidelity and resolution are maintained, but computational time and hardware resources are excessively consumed
Solution Approach 1:
The reticle pattern is divided into multiple blocks, and OPC/RET processes are selectively applied only to specific blocks that require correction rather than the entire reticle. This segmentation approach maintains pattern fidelity in critical areas while significantly reducing computational time and resource consumption by excluding already-sufficient blocks from processing.
Solution Approach 2:
Different blocks of the reticle pattern are treated differently based on their specific requirements. Blocks that need correction receive OPC/RET processing, while blocks that are already sufficient are left unchanged. This local quality approach ensures manufacturing precision is maintained where needed without wasting computational resources on areas that don't require enhancement.
2Manufacturing precision
If optical proximity correction (OPC) and resolution enhancement techniques (RET) are applied to the entire reticle pattern, then pattern fidelity and resolution are maintained, but hardware resources are excessively consumed
Solution Approach 1:
The reticle pattern is divided into multiple blocks, and OPC/RET processes are selectively applied only to specific blocks that require correction rather than the entire reticle. This segmentation approach maintains pattern fidelity in critical areas while significantly reducing computational time and resource consumption by excluding already-sufficient blocks from processing.
Solution Approach 2:
Different blocks of the reticle pattern are treated differently based on their specific requirements. Blocks that need correction receive OPC/RET processing, while blocks that are already sufficient are left unchanged. This local quality approach ensures manufacturing precision is maintained where needed without wasting computational resources on areas that don't require enhancement.
3Productivity
If feature sizes are reduced to increase circuit density, then more devices can be fabricated on each wafer, but optical distortion and pattern degradation worsen
Solution Approach 1:
The reticle pattern is divided into multiple blocks, and OPC/RET processes are selectively applied only to specific blocks that require correction rather than the entire reticle. This segmentation approach maintains pattern fidelity in critical areas while significantly reducing computational time and resource consumption by excluding already-sufficient blocks from processing.
Solution Approach 2:
Different blocks of the reticle pattern are treated differently based on their specific requirements. Blocks that need correction receive OPC/RET processing, while blocks that are already sufficient are left unchanged. This local quality approach ensures manufacturing precision is maintained where needed without wasting computational resources on areas that don't require enhancement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the time and resources needed for OPC and RET processes, maintaining pattern fidelity and resolution while simplifying the workflow, and is compatible with existing systems by being implemented as software additions.
Implementation Method 1
As light passes through the reticle, it is refracted and scattered by the chromium edges. This causes the projected image to exhibit some rounding and other optical distortion.
Implementation Method 2
As light passes through the reticle, it is refracted and scattered by the chromium edges.
Implementation Method 3
Chemical amplification serves to increase the sensitivity of photoresists by creating a photo-generated catalyst (typically an acid) during the exposure.
Data Source
AI summary
System and method of selective optical pattern enhancement for semiconductor manufacturing. A method for performing a photolithography process includes providing a reticle pattern for a photomask, the reticle pattern including one or more active areas, the photomask including at least a first active area and a first insulation area. The method also includes identifying a first structure pattern defined by the reticle pattern. Additionally, the method includes defining a block area covering the first structure, the block area being positioned within the active area. The method further includes applying at least a first optical proximity correction to the reticle pattern to form a corrected pattern, the first optical proximity correction being restricted to the block area. Also, the method includes transferring the corrected pattern to a wafer.