Staggered Aperture E-Beam Lithography Fill Patterns
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Solution Overview
Problem
Current e-beam lithography technologies face challenges in achieving high throughput and precision for advanced integrated circuit manufacturing, particularly in scaling down via pitches and maintaining overlay tolerances, which limits their adoption in high-volume manufacturing environments.
Innovation Solution
The implementation of a staggered beam aperture array with overlapping apertures and the use of dummy fill patterns to stabilize current density, allowing for improved lithography process margin and enabling the patterning of small features with increased resolution and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional e-beam lithography is used for patterning, then manufacturing precision can be achieved, but productivity is limited due to low throughput
Solution Approach 1:
The patent divides the single e-beam writing process into multiple passes with different aperture configurations. The first pass uses a first aperture to write first patterns, and the second pass uses a second aperture to write second patterns, thereby segmenting the overall patterning process to improve throughput while maintaining precision
Solution Approach 2:
The patent employs dynamic aperture switching between at least two different apertures during the e-beam writing process. The system dynamically selects and switches between apertures with different sizes and/or shapes based on the specific patterning requirements, enabling flexible adaptation to different feature sizes and improving overall productivity
2Device complexity
If single aperture e-beam writing is used, then device complexity is low, but manufacturing precision deteriorates for small features
Solution Approach 1:
The patent changes the parameters of the aperture (size, shape) to optimize the e-beam writing process for different feature dimensions. By using multiple apertures with different parameters, the system can achieve high manufacturing precision for small features while managing device complexity through systematic aperture selection
3Manufacturing precision
If e-beam lithography is used for advanced scaling, then manufacturing precision improves, but productivity decreases due to process complexity
Solution Approach 1:
The patent performs preliminary actions by preparing multiple apertures in advance with different configurations. This preliminary preparation enables the system to quickly switch between aperture types during the writing process, thereby maintaining high manufacturing precision for advanced scaling while improving productivity by reducing setup time and process complexity
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 enhances the capability of e-beam lithography to pattern small features with improved resolution and throughput, addressing the limitations of current technologies in high-volume manufacturing by stabilizing current density and reducing focus variations.
Implementation Method 1
aligning the substrate in an e-beam tool to provide the pattern of parallel lines parallel with a scan direction of the e-beam tool
Data Source
AI summary
Lithographic apparatuses suitable for complementary e-beam lithography (CEBL) are described. In an example, a method of forming a pattern for a semiconductor structure includes forming a pattern of parallel lines above a substrate. The method also includes aligning the substrate in an e-beam tool to provide the pattern of parallel lines parallel with a scan direction of the e-beam tool. The e-beam tool includes a column having a blanker aperture array (BAA) with a staggered pair of columns of openings along an array direction orthogonal to the scan direction. The method also includes forming a pattern of cuts or vias in or above the pattern of parallel lines to provide line breaks for the pattern of parallel lines by scanning the substrate along the scan direction. A cumulative current through the column has a non-zero and substantially uniform cumulative current value throughout the scanning.