Self-Aligned Dynamic Pattern Generator for Multi-Beam Lithography
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Solution Overview
Problem
Current electron-beam lithography systems using a single electron beam are inefficient for writing large and complex patterns, leading to high costs and long processing times, while multiple electron-beam systems have the potential for high-resolution and high-throughput but require complex and costly infrastructure.
Innovation Solution
A dynamic pattern generator device that creates multiple individually controlled electron beams through an array of micron-scale pixels, allowing for faster and more efficient electron-beam imaging and lithography by modulating and directing electron beams using a self-aligned device design and fabrication process, eliminating the need for charge dissipating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single electron beam is used for lithography, then the system complexity is low, but the writing speed and throughput are excessively slow
Solution Approach 1:
The patent divides a single electron beam system into multiple independent electron beam columns, each capable of writing patterns simultaneously. This segmentation allows parallel processing of different regions of the substrate, dramatically increasing writing speed and throughput while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent transitions from a single-beam sequential writing approach to a multi-beam parallel writing approach, effectively adding the dimension of spatial parallelism. Multiple electron beams operate simultaneously on different areas of the substrate, converting a one-dimensional sequential process into a multi-dimensional parallel process to enhance productivity
2Productivity
If multiple electron beams are used simultaneously, then the throughput increases, but the fabrication cost and infrastructure complexity increase
Solution Approach 1:
The patent merges multiple electron beam columns into a single integrated lithography tool, sharing common infrastructure elements such as vacuum chambers, control systems, and substrate handling mechanisms. This consolidation achieves high throughput through parallel beam operation while avoiding the proportional increase in infrastructure complexity and cost that would result from separate single-beam systems
Solution Approach 2:
The patent designs the multiple electron beam columns to share common functional subsystems, making each component serve multiple purposes. For example, a single vacuum system supports all beam columns, and a unified control system manages all beams, thereby reducing overall infrastructure complexity while maintaining high substrate throughput
3Manufacturing precision
If photolithographic masks are used for small feature sizes, then the resolution is adequate, but the mask set cost becomes prohibitive for small batch production
Solution Approach 1:
The patent extracts the pattern definition function from physical photolithographic masks and implements it through software-controlled electron beam writing. This eliminates the need for expensive mask sets while maintaining the ability to produce high-resolution small features, making small batch production economically viable by removing the large upfront mask fabrication cost
4Loss of time
If a multiplicity of electron beams is used, then the writing time decreases, but the device complexity and alignment precision requirements increase
Solution Approach 1:
The patent replaces mechanical alignment systems with software-based coordinate transformation and beam positioning control. The multi-beam system uses computational methods to calculate and adjust beam positions and patterns, substituting complex mechanical alignment mechanisms with software algorithms that can dynamically compensate for variations, thereby reducing writing time while managing alignment precision requirements
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
Enables high-performance, high-resolution, and high-throughput electron-beam imaging and lithography at a lower cost by allowing large arrays of individually controlled electron beams, reducing the complexity and expense of the fabrication process and eliminating the need for charge dissipating layers.
Implementation Method 1
When pixels are biased at a low potential, the local electron beam is reflected; when pixels are biased at ground potential, the local electron beam is absorbed at very near zero energy.
Implementation Method 2
The patterned, reflected electron beam is then reaccelerated and rotated by the magnetic prism
Data Source
AI summary
A dynamic pattern generator (DPG) device and method of making a DPG device are disclosed. The DPG device is used in semiconductor processing tools that require multiple electron-beams, such as direct-write lithography. The device is a self-aligned DPG device that enormously reduces the required tolerances for aligning the various electrode layers, as compared to other design configurations including the non-self-aligned approach and also greatly simplifies the process complexity and cost. A process sequence for both integrated and non-integrated versions of the self-aligned DPG device is described. Additionally, an advanced self-aligned DPG device that eliminates the need for a charge dissipating coating or layer to be used on the device is described. Finally, a fabrication process for the implementation of both integrated and non-integrated versions of the advanced self-aligned DPG device is described.