Template Transfer Region Balancing for Nanoimprint Lifespan
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Solution Overview
Problem
The nanoimprinting method for semiconductor device fabrication often results in template breakage and defects due to uneven usage of transfer regions, leading to unbalanced pattern transfer and increased likelihood of defects, which shortens the template's lifespan.
Innovation Solution
A pattern transfer apparatus with a transfer region selecting part that evenly distributes the number of pattern transfers across multiple transfer regions on a template, ensuring balanced usage and preventing collisions between transfer regions and previously patterned areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the template is firmly pressed on the resist layer for pattern transfer, then the pattern transfer precision is improved, but the template breakage and defects increase
Solution Approach 1:
The template is divided into multiple transfer regions (first transfer region, second transfer region, etc.), allowing the pressing force to be distributed across different regions sequentially rather than concentrating stress on a single region during repeated transfers
Solution Approach 2:
The pattern transfer process is planned in advance with predetermined transfer regions assigned to specific shot regions. This preliminary arrangement ensures that each transfer region is used an equal number of times, preventing overuse of any single region and reducing cumulative stress that could cause breakage
2Productivity
If the template is used for multiple pattern transfers, then the productivity is improved, but the template lifespan decreases due to uneven usage
Solution Approach 1:
Before performing pattern transfers, the system predeterminedly assigns specific transfer regions to specific shot regions based on a plan that ensures equal usage. This preliminary arrangement prevents uneven wear and extends template lifespan while maintaining high productivity
Solution Approach 2:
The system monitors and manages the usage count of each transfer region, using this information to make decisions about which regions to use next. This feedback mechanism ensures balanced utilization across all transfer regions, optimizing both productivity and template lifespan
3Productivity
If multiple transfer regions are used on the template, then the productivity is improved, but the likelihood of collisions with previously patterned areas increases
Solution Approach 1:
The template is segmented into multiple transfer regions, and the system manages which regions are active at different times. This segmentation allows multiple regions to be utilized for high productivity while the control system prevents collisions by assigning regions appropriately to different shot regions
Solution Approach 2:
The system predeterminedly assigns transfer regions to shot regions before the transfer process begins. This preliminary assignment ensures that when multiple transfer regions are used, they are used in a coordinated manner that avoids collisions with previously patterned areas, maintaining pattern quality
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 prevents template breakage and defects by evenly distributing the number of transfers, thereby extending the template's lifespan and maintaining pattern quality across the semiconductor device.
Implementation Method 1
an ultraviolet irradiating unit (3) that irradiates the imprinting material on the wafer (W) with ultraviolet light via the template (TM)
Data Source
AI summary
A pattern transfer apparatus according to one embodiment includes a transfer region selecting part that performs operation in which when performing pattern transfer from a template provided with N transfer regions (N is an integer of 2 or larger) to a transferring substrate a plurality of times, 1 to N−1 transfer regions, which are to be used to perform the transfer to regions of the transferring substrate corresponding to part of the N transfer regions, are selected such that the number of the transfer to be performed using each of the N transfer regions is evened out.