Electrostatic Chuck Dielectric Stack for Uniform Substrate Adsorption
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Solution Overview
Problem
Semiconductor substrates often experience warpage due to repeated processing, leading to non-uniform adsorption on substrate mounting tables, which affects processing precision and increases errors.
Innovation Solution
A substrate processing apparatus with a mounting table featuring an insulator with embedded electrodes and heaters, a dielectric layer with a thick intermediate material layer of higher dielectric constant, and a gas distribution unit to improve chucking force without increasing voltage, ensuring uniform substrate adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If voltage is increased to improve chucking force, then substrate adsorption strength is improved, but energy consumption and device complexity increase
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulator material to improve chucking force. By using a material with higher dielectric constant (such as aluminum oxide with εr=10.2 or zirconium oxide with εr=25.6) instead of conventional materials like silicon dioxide (εr=3.9), the electrostatic field strength is enhanced without increasing the applied voltage, thereby resolving the contradiction between improving chucking force and reducing energy consumption.
Solution Approach 2:
The patent employs composite material structures in the dielectric layer, combining multiple materials with different dielectric constants and thicknesses. The dielectric layer includes a lower material layer, an intermediate material layer with higher dielectric constant, and an upper material layer, creating a composite structure that optimizes both chucking force and voltage requirements.
2Device complexity
If substrate mounting table structure is simplified, then device complexity is reduced, but manufacturing precision of uniform adsorption deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different dielectric constants within the insulator. The intermediate material layer with higher dielectric constant is strategically positioned to enhance the electrostatic field in specific regions, ensuring uniform adsorption across the substrate surface without requiring complex overall structural modifications.
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 solution enhances chucking force, allowing for uniform substrate adsorption and reducing processing errors by improving the electrostatic chucking mechanism, thus maintaining precision and stability during semiconductor processing.
Implementation Method 1
an electrode and a heater are embedded in the insulator... a first power supply unit that applies a first voltage to the electrode... enhances chucking force, allowing for uniform substrate adsorption... improving the electrostatic chucking mechanism
Implementation Method 2
an electrode and a heater are embedded in the insulator... a second power supply unit that applies a second voltage to the heater
Data Source
AI summary
A substrate processing apparatus that includes a mounting table including an insulator having a loading surface; a gas distribution unit including injection holes; and a gas supply unit that supplies process gas. An electrode and a heater are embedded in the insulator, and a dielectric layer covers the loading surface. The dielectric layer includes a lower material layer, an intermediate material layer, and an upper material layer. The intermediate material layer has a third thickness, greater than each of a first thickness of the lower material layer and a second thickness of the upper material layer. The intermediate material layer has a third dielectric constant, greater than each of a first dielectric constant of the lower material layer and a second dielectric constant of the upper material layer.