Charged Particle Beam Lithography Write Time Reduction
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Solution Overview
Problem
Charged particle beam lithography is time-consuming and costly due to the high exposure time required to write complex patterns on surfaces like reticles and wafers, especially for advanced semiconductor devices where precision and accuracy are critical.
Innovation Solution
The introduction of an artificial background dose in low-density exposure areas reduces the overall write time by modifying the exposure information, allowing for a lower dose to be applied, thereby accelerating the writing process without compromising accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high dose of charged particle beam is applied to ensure pattern accuracy, then manufacturing precision is improved, but write time increases
Solution Approach 1:
The patent applies different dose strategies to different regions of the exposure area. Low-density regions receive an artificial background dose to reduce their exposure time, while high-density regions maintain their original dose requirements for pattern accuracy. This localized differentiation resolves the contradiction by allowing speed optimization in specific areas without compromising overall precision.
Solution Approach 2:
The artificial background dose is applied as a preliminary action before the main exposure process. By pre-exposing low-density areas with a background dose, the patent reduces the additional dose needed during the main exposure, thereby reducing total write time while maintaining the ability to achieve accurate pattern formation.
2Productivity
If the charged particle beam write time is reduced to improve productivity, then productivity is improved, but manufacturing precision may deteriorate
Solution Approach 1:
The patent selectively applies dose reduction only to low-density exposure regions where pattern accuracy is less critical, while maintaining full dose in high-density regions where precision is paramount. This resolves the contradiction by allowing productivity improvement in non-critical areas without sacrificing manufacturing precision in critical areas.
Solution Approach 2:
The patent changes the dose parameter dynamically based on exposure density. By calculating and applying different dose levels to different regions (higher dose for high-density areas, reduced dose for low-density areas), the system achieves both improved productivity and maintained precision through parameter optimization.
3Loss of time
If an artificial background dose is added to low-density areas, then write time is reduced, but device complexity increases
Solution Approach 1:
The system performs self-service by automatically calculating backscatter, identifying low-density regions, and determining the appropriate artificial background dose without external intervention. This automation minimizes the practical complexity increase, as the additional processing is handled autonomously by the exposure system itself.
Solution Approach 2:
The patent implements a feedback mechanism where the system calculates backscatter effects, analyzes exposure density distribution, and uses this information to determine the optimal artificial background dose. This feedback loop enables the system to automatically optimize exposure parameters, resolving the complexity issue through intelligent self-adjustment.
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 write time for charged particle beam lithography, enhancing the efficiency and cost-effectiveness of the process while maintaining the necessary precision for advanced semiconductor manufacturing.
Implementation Method 1
charged particle beams shoot energy to a resist-coated surface to expose the resist
Implementation Method 2
A backscatter is calculated for the area of the pattern based on the exposure information
Data Source
AI summary
A method for exposing a pattern in an area on a surface using a charged particle beam lithography is disclosed and includes inputting an original set of exposure information for the area. A backscatter is calculated for the area of the pattern based on the exposure information. An artificial background dose is determined for the area. The artificial background dose comprises additional exposure information and is combined with the original set of exposure information creating a modified set of exposure information. A system for exposing a pattern in an area on a surface using a charged particle beam lithography is also disclosed.