Multi-tone Amplitude Photomask Stepped Pattern
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Solution Overview
Problem
Existing photomask technologies require multiple masking steps, leading to alignment errors, increased processing time, and higher costs due to the need for multiple levels of optical density to achieve multi-tone patterns on substrates.
Innovation Solution
A multi-tone amplitude photomask is fabricated using a stepped pattern with multiple layers of light attenuating materials, where each layer provides a different level of optical density, allowing for the creation of patterns with various heights of photoresist through controlled light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple masking steps are used to create multi-tone patterns, then patterns with different optical densities can be achieved, but alignment errors increase and processing time increases
Solution Approach 1:
The photomask is segmented into multiple layers (first layer and second layer), each with different optical densities. The first layer has a first optical density and the second layer has a second optical density different from the first. By stacking these layers in series, the photomask can provide multiple distinct optical density levels (first, second, and third optical densities) in a single masking step, eliminating the need for multiple sequential masking steps and their associated alignment errors and processing time.
Solution Approach 2:
Multiple layers with different optical densities are merged into a single photomask structure. The first layer and second layer are positioned in series relative to the light source, creating a combined optical filtering system that provides multiple optical density levels simultaneously. This merging approach consolidates what would otherwise require multiple separate masking operations into one unified component.
2Manufacturing precision
If multiple masking steps are used to create multi-tone patterns, then patterns with different optical densities can be achieved, but alignment accuracy decreases
Solution Approach 1:
The photomask is segmented into multiple layers (first layer and second layer), each with different optical densities. The first layer has a first optical density and the second layer has a second optical density different from the first. By stacking these layers in series, the photomask can provide multiple distinct optical density levels (first, second, and third optical densities) in a single masking step, eliminating the need for multiple sequential masking steps and their associated alignment errors and processing time.
Solution Approach 2:
Multiple layers with different optical densities are merged into a single photomask structure. The first layer and second layer are positioned in series relative to the light source, creating a combined optical filtering system that provides multiple optical density levels simultaneously. This merging approach consolidates what would otherwise require multiple separate masking operations into one unified component.
3Manufacturing precision
If multiple masking steps are used to create multi-tone patterns, then patterns with different optical densities can be achieved, but manufacturing cost increases
Solution Approach 1:
The photomask is segmented into multiple layers (first layer and second layer), each with different optical densities. The first layer has a first optical density and the second layer has a second optical density different from the first. By stacking these layers in series, the photomask can provide multiple distinct optical density levels (first, second, and third optical densities) in a single masking step, eliminating the need for multiple sequential masking steps and their associated alignment errors and processing time.
Solution Approach 2:
Multiple layers with different optical densities are merged into a single photomask structure. The first layer and second layer are positioned in series relative to the light source, creating a combined optical filtering system that provides multiple optical density levels simultaneously. This merging approach consolidates what would otherwise require multiple separate masking operations into one unified component.
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 reduces processing time and costs by enabling the creation of multi-tone patterns with precise control over photoresist heights, improving alignment accuracy and efficiency in manufacturing multi-layer structures.
Implementation Method 1
Each level of the stepped pattern provides a different intensity of light when a light source shines light on the stepped pattern
Data Source
AI summary
A method of fabricating a multi-tone amplitude photomask includes providing a mask substrate. The method includes providing a stepped pattern in at least one layer of material on a surface of the mask substrate. The stepped pattern includes at least two steps and at least three levels. Each level of the stepped pattern provides a different intensity of light when a light source shines light on the stepped pattern.