Planarized Substrate Holder for Thin-Film Chuck Components
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Solution Overview
Problem
Conventional substrate holders in lithographic apparatuses have rough surfaces due to processes like etching and laser ablation, making it difficult to reliably form electronic components such as heaters and sensors, which are necessary for precise temperature control and electrostatic clamping.
Innovation Solution
A substrate holder with a planarization layer on its surface, formed by applying a polysilazane solution and curing it to create a smooth surface for reliable formation of thin-film components like electrodes, heaters, and sensors, addressing the surface roughness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional substrate holders are manufactured using etching and laser ablation processes, then the substrate holder can be formed with necessary structural features (burls), but the surface becomes rough making it difficult to reliably form electronic components
Solution Approach 1:
The substrate holder is divided into two functional parts: the main body structure (formed by etching and laser ablation with burls) and the surface layer (planarization layer formed by polysilazane solution application and curing). This segmentation allows each part to be optimized independently for its specific function.
Solution Approach 2:
The substrate holder combines the original substrate holder material (with rough surface from manufacturing processes) with a planarization layer made from polysilazane solution that cures to form a smooth surface. This composite structure provides both the structural integrity needed for burl formation and the smooth surface required for reliable electronic component formation.
2Reliability
If a planarization layer is added to the substrate holder surface, then electronic components can be reliably formed, but the device structure becomes more complex
Solution Approach 1:
The planarization layer serves multiple functions simultaneously: it provides a smooth surface for electronic component formation, acts as a stress buffer between the rough substrate holder and the electronic components, and can serve as an insulating layer. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The planarization layer changes the surface parameters of the substrate holder from rough to smooth, enabling reliable electronic component formation without fundamentally altering the overall substrate holder structure or requiring complex additional components.
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
The planarization layer provides a smooth surface for reliable formation of electronic components, enhancing the ability to control temperature and stress in the substrate, thereby improving imaging accuracy and reducing errors caused by thermal expansion or contraction.
Implementation Method 1
formed by applying a polysilazane solution and curing it to create a smooth surface
Data Source
AI summary
A substrate holder for a lithographic apparatus has a planarization layer provided on a surface thereof. The planarization layer provides a smooth surface for the formation of an electronic component such as a thin film electronic component. The planarization layer may be provided in multiple sub layers. The planarization layer may smooth over roughness caused by removal of material from a blank to form burls on the substrate holder.