Replaceable Lift Pin Tips for Wafer Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lift pin assemblies for wafer handling in deposition processes are not customizable, lead to tool downtime for maintenance, and suffer from defocusing and de-chucking issues due to non-replaceable tips and lack of adjustability.
Innovation Solution
A lift pin system with a spring-loaded mechanism and replaceable tips that can be customized for specific processes and wafer characteristics, allowing for easy replacement and adjustment above the electrostatic chuck surface, reducing the need for chamber access and minimizing operator error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lift pin tips are made non-replaceable in current assemblies, then the structure is simpler, but tool downtime increases for maintenance and replacement
Solution Approach 1:
The lift pin assembly is divided into separable components: a reusable housing and replaceable tips. The tip can be independently removed and replaced by unscrewing it from the housing, allowing maintenance without replacing the entire assembly. This segmentation enables quick tip replacement to reduce tool downtime while keeping the overall structure relatively simple.
Solution Approach 2:
The tip is extracted as a separate, removable component from the lift pin assembly. The tip can be taken out and replaced independently from the housing and support arm assembly. This extraction allows the tip to be maintained or replaced quickly without affecting other components, reducing tool downtime while maintaining structural simplicity.
2Adaptability or versatility
If lift pin assemblies are made customizable for different processes, then adaptability improves, but device complexity increases
Solution Approach 1:
The lift pin assembly is segmented into a standardized housing and interchangeable tips. Different tip types can be screwed into the same housing to accommodate different processes and wafer characteristics. This segmentation provides customization capability while keeping the housing structure simple and reusable.
Solution Approach 2:
The housing is designed as a universal component that can accommodate multiple tip types. The standardized thread pattern and interface allow the same housing to work with different tips for various processes, providing adaptability without requiring multiple complex assembly designs.
3Ease of repair
If complete removal from process chamber is required for tip replacement, then maintenance is more thorough, but productivity decreases
Solution Approach 1:
The tip is segmented as a separately replaceable component that can be accessed and replaced from above the electrostatic chuck surface. This segmentation allows tip replacement without requiring complete removal of the lift pin assembly from the process chamber, enabling quick maintenance while maintaining thorough servicing capability.
Solution Approach 2:
The tip extraction design allows it to be removed and replaced independently from the process chamber. The tip can be taken out through the housing opening accessible from above the electrostatic chuck, enabling maintenance without chamber access or complete assembly removal, thus maintaining productivity.
4Device complexity
If tips are not replaceable, then device complexity is reduced, but reliability decreases due to defocusing and de-chucking issues
Solution Approach 1:
The lift pin assembly is segmented with a replaceable tip component that can be exchanged when wear or damage occurs. This segmentation allows the critical contact tip to be replaced to maintain proper wafer support and electrostatic chucking performance, improving reliability while keeping the overall structure relatively simple.
Solution Approach 2:
The tip material, geometry, or surface properties can be changed by replacing the tip component. Different tip types can be selected based on specific process requirements or wafer characteristics, allowing parameter optimization for reliable wafer handling while maintaining a simple assembly structure.
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 reduces tool downtime, improves repeatability of spring force, and enhances customization options for different processes and wafers, minimizing defocusing and de-chucking issues, thereby increasing efficiency and reducing maintenance time.
Implementation Method 1
Each of the plurality of pins may further include a spring within the housing, the spring biasing against the tip.
Data Source
AI summary
A lift pin system and a lift pin assembly are disclosed. In one or more approaches, a lift pin system includes a wafer support, such as an electrostatic chuck or a platen, and a lift pin assembly coupled to the wafer support. The lift pin assembly may include a plurality of pins. Each of the plurality of pins may include a tip extending through a housing, a spring within the housing, wherein the spring biases against the tip, and a support arm coupled to the housing. In some approaches, the housing is threadably coupled with the support arm to allow access to the tip of each pin above a top surface of the wafer support for easy replacement. The replaceable pin tips further permit easier customization of pin tip geometries, materials, spring force, etc., depending on specific process and/or wafer characteristics.