Electron Beam Array Modulation for High-Throughput Lithography
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Solution Overview
Problem
Current electron beam lithography is limited by slow exposure rates and vulnerability to contamination, making it unsuitable for high-volume production and requiring extensive maintenance, especially when operating at centimeter scales or longer distances.
Innovation Solution
A novel electron beam array source with millions of micron-scale beams, modulated by low-voltage electronics, is developed, which is resistant to contamination and can operate in air, coupled with CMOS technology for high-throughput and precise pattern generation, using shaped apertures and electron-transparent pellicles to maintain stability and focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If single electron beams are used for lithography, then nanometer-scale resolution is achieved, but exposure rate is too slow for volume production
Solution Approach 1:
The patent divides a single electron beam system into multiple independent electron beams operating in parallel. Each beam maintains nanometer-scale resolution capability while the collective array achieves high-throughput exposure by processing multiple areas simultaneously, resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent transitions from one-dimensional single-beam scanning to a two-dimensional array of simultaneous beams. This dimensional expansion allows multiple exposure points to operate concurrently across the target surface, dramatically increasing throughput while preserving the resolution capabilities of individual beams.
2Productivity
If multiple electron beams are used in parallel, then data rate is increased, but beam intensity is limited due to electron repulsion at centimeter scale
Solution Approach 1:
The patent segments the electron beam system into multiple low-intensity independent beams rather than attempting to increase the intensity of a single beam. This segmentation allows parallel operation where each beam operates below the repulsion threshold while the collective system achieves high data rates through simultaneous exposure of multiple areas.
3Length of moving object
If electron beam sources are exposed to target contamination, then short distances are required for operation, but source is rapidly spoiled and maintenance downtime increases
Solution Approach 1:
The patent employs disposable or easily replaceable electron beam sources that can be rapidly swapped when contaminated. This approach eliminates lengthy maintenance downtime by allowing quick replacement rather than complex repair, making the system tolerant of contamination while maintaining high productivity.
Solution Approach 2:
The patent implements a strategy where contaminated beam sources are discarded and replaced with fresh sources. This simple recovery mechanism avoids complex decontamination procedures and minimizes system downtime, allowing the lithography system to maintain high productivity despite the consumable nature of the beam sources.
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 solution enables exposure of trillions of pixels per second with nanometer-scale resolution, significantly improving throughput and reducing downtime due to its robustness and ease of replacement, while maintaining high precision and minimizing contamination effects.
Implementation Method 1
Individual electron emitters include a first conductor having a conductor edge, an insulator adjacent to the first conductor, and a second conductor adjacent to the insulator. The first conductor, the insulator, and the second conductor may form a channel such that an electric field from the second conductor at the opposite side of the insulator from the first conductor attracts electrons to form an electron beam via Fowler-Nordheim electron emission directed away from the conductor edge of the first conductor through the channel past the second conductor into a vacuum chamber beyond the second conductor.
Data Source
AI summary
Systems and methods are described herein for generating, modulating, and/or shaping a plurality of electron beams to be used in various lithography processes. In some aspects, multiple beams may be individually modulated to create a pattern which is projected onto a surface proximate to the source of the electrons. In other aspects, the multiple beams may be projected at a distance through a lensing system. Targets for the electron patterns include surfaces which react with the electrons to undergo chemical or structural change. In some aspects, a parallel electron multi-beam source is constructed using edge emitters formed where etching, cleaving, or other processes have created a surface perpendicular to the edge of one conductor which is adjacent to a thin insulator which separates it from a second conductor.