Template Substrate Concave Structure for Pattern Transfer
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Solution Overview
Problem
In semiconductor manufacturing, template substrates with step structures face challenges in efficiently transferring patterns due to defects and prolonged transfer times, and existing designs struggle to balance adsorption area and pattern area, leading to issues like dechucking and increased productivity costs.
Innovation Solution
A template substrate with a concave structure where the area of the bottom surface is larger than the opening end, allowing for increased pattern area and secure adsorption, reducing bubble biting and enabling easier separation, thus enhancing productivity and adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the template substrate has a larger pattern area, then the productivity and pattern transfer speed are improved, but the adsorption area is reduced leading to dechucking issues
Solution Approach 1:
The patent introduces a stepped structure with multiple levels (first step, second step, third step) on the template substrate. This vertical dimensionality allows the pattern area to be enlarged on upper steps while maintaining a separate adsorption area on lower steps or the base substrate, thus resolving the contradiction between pattern area and adsorption area.
Solution Approach 2:
The template substrate is segmented into distinct functional regions: pattern formation regions (steps 1, 2, 3) and adsorption regions (lower steps or base). This segmentation allows independent optimization of pattern area for productivity and adsorption area for stable attachment, eliminating the trade-off.
2Ease of manufacture
If the template substrate uses a conventional flat structure, then the manufacturing process is simple, but bubble biting occurs and pattern transfer efficiency is reduced
Solution Approach 1:
The patent transitions from a flat two-dimensional structure to a three-dimensional stepped structure. This adds vertical dimension for bubble escape pathways while maintaining manufacturing feasibility through standard semiconductor fabrication processes like spin coating and photolithography.
Solution Approach 2:
The stepped structure acts as an intermediary mechanism that facilitates bubble removal during pattern transfer. The steps provide intermediate regions where bubbles can be trapped and eliminated, preventing bubble biting defects without requiring complex additional components.
3Strength
If the template substrate has a larger adsorption area, then the adsorption strength is improved, but the pattern area is reduced leading to lower productivity
Solution Approach 1:
The substrate is divided into functionally separate adsorption regions and pattern regions. The adsorption regions (lower steps or base areas) provide sufficient surface area for strong adsorption, while the pattern regions (upper steps) provide the necessary pattern area, allowing both requirements to be satisfied simultaneously.
Solution Approach 2:
By utilizing vertical steps, the patent creates distinct horizontal planes for adsorption and patterning. This allows the adsorption area to be maximized on lower levels while the pattern area is maximized on upper levels, eliminating the inverse relationship between these two parameters.
Data Source
AI summary
A template substrate includes a pedestal portion on a first surface of a substrate. The template substrate defines an opening region provided in a second surface opposite to the first surface of the substrate. The opening region includes an opening end on a second surface side of the opening region corresponding to the second surface and a bottom surface on a first surface side of the opening region corresponding to the first surface. An area of the opening end is different from an area of the bottom surface.