Electron-Beam Lithography Chilled Developer Control
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Solution Overview
Problem
Current optical lithography techniques face limitations in improving the size and resolution of semiconductor IC patterns due to optical diffraction limits and the need for multiple masks, which increases manufacturing costs and complicates the production of smaller and more complex semiconductor integrated circuits.
Innovation Solution
An electron-beam lithography method and system that controls the proximity effect by using a low-temperature chilled developer solution to accurately manage the development pattern size and resolution, incorporating an electron-beam device, a developer device, a cooling device, and a controller to regulate the developer solution's temperature and dissolution rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical lithography is used to form exposure patterns, then manufacturing process is simple, but pattern size and resolution cannot be improved due to optical diffraction limit
Solution Approach 1:
The patent changes the physical state parameter of the developer solution by lowering its temperature. This parameter change modifies the dissolution rate of the developer, enabling precise control over the development process and achieving sub-10nm pattern resolution while avoiding the optical diffraction limitations of conventional lithography
Solution Approach 2:
The patent applies preliminary cooling treatment to the developer solution before the development process. By pre-chilling the developer to a specific low temperature range, the system prepares the developer with controlled dissolution characteristics in advance, allowing accurate pattern formation without requiring complex real-time adjustments during development
2Adaptability or versatility
If optical lithography uses different masks for different exposure patterns, then pattern variety increases, but manufacturing cost increases
Solution Approach 1:
The patent replaces the mechanical mask system with an electron-beam direct writing system. Instead of using physical masks that require fabrication and replacement for different patterns, the electron beam directly writes the desired patterns onto the resist, eliminating mask-related costs and enabling flexible pattern changes without additional manufacturing overhead
Solution Approach 2:
The patent utilizes the ability to change electron beam parameters (energy, current, scanning pattern) to achieve different exposure patterns without physical masks. By modifying beam parameters and scanning trajectories, the system can produce varied patterns cost-effectively
3Manufacturing precision
If electron-beam lithography is used to write patterns directly without masks, then pattern resolution improves, but proximity effect causes inaccurate pattern size control
Solution Approach 1:
The patent changes the temperature parameter of the developer solution to a low temperature range. This parameter change reduces the dissolution rate and limits the spread of developer action, thereby compensating for the proximity effect of electron beam scattering and achieving accurate pattern size control
Solution Approach 2:
The patent applies preliminary cooling to the developer solution to counteract the harmful proximity effect before development occurs. By pre-chilling the developer, the system creates a controlled dissolution environment that prevents excessive lateral development, effectively compensating for electron beam scattering effects
4Manufacturing precision
If developer solution temperature is not controlled, then development process is simple, but dissolution rate cannot be accurately controlled
Solution Approach 1:
The patent changes the temperature parameter of the developer solution to a specific low temperature range. This parameter change provides precise control over the dissolution rate, enabling accurate pattern formation. The temperature control system, while adding complexity, enables manufacturing precision at the sub-10nm scale
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 enables precise control over the size and resolution of semiconductor IC patterns, allowing for the formation of smaller features, such as patterns ranging from 4 nm to 8 nm, and improves the tolerance for achieving predetermined pattern sizes, reducing manufacturing costs and complexity.
Implementation Method 1
a low-temperature treatment is performed to chill a developer solution
Implementation Method 2
Utilize an electron-beam to irradiate an exposure region of a positive-tone electron-sensitive layer
Data Source
AI summary
An electron-beam lithography method includes, computing and outputting a development time of a positive-tone electron-sensitive layer and a parameter recipe of an electron-beam device by using a pattern dimension simulation system, performing a low-temperature treatment to chill a developer solution, utilizing an electron-beam to irradiate an exposure region of the positive-tone electron-sensitive layer based on the parameter recipe, and utilizing the chilled developer solution to develop a development region of the positive-tone electron-sensitive layer based on the development time. The development region is present within the exposure region, and an area of the exposure region is smaller than that of the first portion. As a result, the electron-beam lithography method may control a dimension of a development pattern of the positive-tone electron-sensitive layer more accurately, and may also shrink a minimum dimension of the development pattern of the positive-tone electron-sensitive layer.