Electrostatic Chuck Insulating Plate Dielectric Constant
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrostatic chuck assemblies for semiconductor and flat panel devices face challenges in achieving high plasma density and uniformity, leading to inconsistent patterning processes due to inefficient plasma generation and dissipation of high-frequency electric power.
Innovation Solution
The electrostatic chuck assembly incorporates a dielectric plate with an absorption electrode, a conductive base plate that functions as a plasma-generating electrode, and an insulating plate with a lower dielectric constant insulation sink, along with a blocking ring and focus ring to enhance plasma uniformity and density by minimizing power dissipation and maximizing power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrostatic chuck assembly is used, then the substrate can be secured to a fixed stage, but plasma density and uniformity are insufficient leading to inconsistent patterning processes
Solution Approach 1:
The insulating plate is designed with non-uniform dielectric constant distribution, featuring a first region with dielectric constant K1 and a second region with dielectric constant K2 where K1 < K2. This local quality variation creates different impedance characteristics in different regions, enabling uniform plasma distribution across the substrate surface despite the inherent non-uniformity of plasma generation in conventional designs.
Solution Approach 2:
The patent changes the dielectric constant parameter of the insulating plate material to optimize plasma generation. By selecting materials with specific dielectric constants (K1 and K2) for different regions, the system achieves better plasma uniformity and density control, directly addressing the manufacturing precision issue in patterning processes.
2Power
If high frequency electric power is applied to generate plasma, then plasma generation occurs, but power dissipation reduces plasma density efficiency
Solution Approach 1:
The patent optimizes the dielectric constant parameter of the insulating plate to minimize power dissipation. By carefully selecting K1 and K2 values, the system reduces energy loss during high frequency power application while maintaining effective plasma generation, thereby improving overall power efficiency and plasma generation efficiency simultaneously.
Solution Approach 2:
The non-uniform dielectric constant distribution in the insulating plate creates localized impedance matching in different regions. The first region with lower dielectric constant (K1) and the second region with higher dielectric constant (K2) work together to reduce standing waves and power dissipation, enabling more efficient power transfer to the plasma generation zone.
3Manufacturing precision
If the insulating plate has uniform dielectric constant, then manufacturing is simple, but plasma uniformity across the substrate is poor
Solution Approach 1:
The insulating plate incorporates regions with different dielectric constants (K1 and K2) to achieve uniform plasma distribution. This local quality differentiation compensates for the inherent non-uniformity in plasma generation, improving plasma uniformity across the substrate without requiring complex external control systems.
Solution Approach 2:
The patent employs composite material construction for the insulating plate, combining materials with different dielectric constants in specific spatial arrangements. This composite structure enables precise control over electromagnetic field distribution and plasma uniformity while maintaining reasonable manufacturing complexity through established composite material fabrication techniques.
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 configuration significantly improves plasma uniformity and density across the substrate, ensuring consistent processing outcomes, particularly for large-sized wafers, by reducing overall capacitance and increasing impedance, thereby enhancing production yield.
Implementation Method 1
a dielectric plate having an absorption electrode therein for generating an electrostatic force and to which a substrate may be secured by the electrostatic force
Implementation Method 2
a conductive base plate positioned under the dielectric plate and to which a high frequency electric power may be applied such that the base plate functions as an electrode for generating plasma
Data Source
AI summary
An electrostatic chuck assembly includes a dielectric plate having an absorption electrode to generate an electrostatic force, the dielectric plate securing a substrate by the electrostatic force, a conductive base plate under the dielectric plate to be applied with a high frequency electric power, the conductive base plate being an electrode to generate plasma, and an insulating plate under the base plate, the insulating plate having an insulation body and an insulation sink, and the insulation sink having a dielectric constant lower than that of the insulation body.