Cup-Shaped Pixel Pads for Maskless Electron Beam Lithography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electron beam direct write (EBDW) lithography is limited by low throughput due to its sequential, point-wise writing process, which is time-consuming, and electron beam projection lithography requires costly customer-specific masks for each structure, making it uneconomical for small-scale production.
Innovation Solution
A maskless reflection electron beam lithography system that floods the wafer with a high beam current electron beam, partitioned into independently controllable beams using a dynamic pattern generator with cup-shaped pixel pads and stacked electrodes, allowing for high-resolution writing across a large area without the need for multiple columns or complex blanker arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electron beam direct write (EBDW) lithography is used for high-resolution writing, then manufacturing precision is improved, but productivity deteriorates due to sequential point-wise writing
Solution Approach 1:
The patent divides the electron beam into multiple independently controllable beams using a dynamic pattern generator with segmented electrode structures. This allows simultaneous writing at multiple locations on the substrate, transforming the sequential point-wise writing process into a parallel multi-point writing process, thereby improving throughput while maintaining high resolution
Solution Approach 2:
The patent introduces a temporal dimension to the writing process by dynamically switching between different beam patterns and locations. The dynamic pattern generator enables time-multiplexed parallel writing where multiple patterns are written in rapid succession, effectively increasing productivity without sacrificing the precision achievable at each point
2Productivity
If electron beam projection lithography is used for high throughput, then productivity is improved, but device complexity increases due to requirement of customer-specific masks
Solution Approach 1:
The patent replaces physical masks with a dynamic pattern generator that electronically generates and projects patterns onto the substrate. The pattern generator creates digital copies of desired patterns that can be dynamically changed without physical mask changes, eliminating mask production complexity while maintaining high throughput projection lithography capabilities
Solution Approach 2:
The patent introduces dynamic controllability to the pattern generation process through voltage-controlled electrode structures. Patterns can be dynamically switched and modified in real-time without requiring physical mask changes, transforming the static mask-based system into a dynamic programmable system that achieves high throughput without mask production complexity
3Area of stationary object
If multiple columns or complex blanker arrays are used to increase writing area, then area of stationary object is improved, but device complexity increases
Solution Approach 1:
The patent employs a single multi-functional dynamic pattern generator that can simultaneously generate multiple independent beam patterns and direct them to different locations on the substrate. This universal pattern generator replaces the need for multiple separate columns or complex blanker arrays, achieving large writing area coverage while minimizing device complexity through functional integration
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 breaks the speed-versus-resolution tradeoff by enabling high-throughput, high-resolution writing on a large area with minimal electron-electron interactions, reducing production time and costs associated with mask production.
Implementation Method 1
conductive pixel pads are advantageously cup shaped with a bottom portion, a sidewall portion, and an open cavity
Implementation Method 2
floods the wafer with a high beam current electron beam, partitioned into independently controllable beams
Data Source
AI summary
One embodiment relates to a dynamic pattern generator for reflection electron beam lithography which includes conductive pixel pads, an insulative border surrounding each conductive pixel pad so as to electrically isolate the conductive pixel pads from each other, and conductive elements coupled to the conductive pixel pads for controllably applying voltages to the conductive pixel pads. The conductive pixel pads are advantageously cup shaped with a bottom portion, a sidewall portion, and an open cavity. Another embodiment relates to a pattern generating apparatus which includes a well structure with sidewalls and a cavity configured above each conductive pixel pad. The sidewalls may include alternating layers of conductive and insulative materials. Other embodiments, aspects and feature are also disclosed.