Dielectric Seasoning Films for High-Voltage Electrostatic Chucks
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Solution Overview
Problem
Conventional electrostatic chucks experience increased leakage currents at higher chucking voltages due to the electrical conductivity of their seasoning films, limiting the ability to counteract substrate warping from cumulative stress during multilayer deposition.
Innovation Solution
The use of dielectric seasoning films with a dielectric constant greater than 3.5 and reduced leakage currents, applied with voltages up to 500 V, to enhance electrostatic chucking forces and reduce arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seasoning films are used on electrostatic chucks, then the chuck can hold substrate wafers, but leakage current increases at higher chucking voltages
Solution Approach 1:
The patent changes the dielectric constant parameter of the seasoning film from conventional values (typically κ < 3.5) to higher values (κ > 3.5). This parameter change increases the electrical insulation performance of the seasoning film, thereby reducing leakage current while maintaining electrostatic chucking force. The higher dielectric constant allows the film to better insulate the high voltage applied to the electrostatic chuck, preventing charge leakage through the film.
2Force
If higher chucking voltages are applied to counteract substrate warping, then electrostatic chucking force increases, but leakage current increases
Solution Approach 1:
The patent introduces an improved seasoning film as an intermediary layer between the electrostatic chuck surface and the substrate wafer. This intermediary layer with high dielectric constant (κ > 3.5) acts as a better electrical insulator, allowing higher chucking voltages to be applied without proportionally increasing leakage current. The film mediates between the high voltage requirement for counteracting substrate warping and the need to minimize energy loss through leakage.
3Adaptability or versatility
If multilayer deposition is performed to create integrated circuits, then device complexity and functionality increase, but cumulative stress causes substrate warping
Solution Approach 1:
The patent applies preliminary anti-action by using the electrostatic chuck with high dielectric constant seasoning film to counteract the warping force before it significantly affects substrate processing. The high chucking voltage (enabled by the low leakage current film) generates strong electrostatic forces that hold the substrate flat against the chuck surface, preemptively preventing warping from compromising the multilayer deposition process. This preliminary counter-action maintains substrate planarity throughout the fabrication process.
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 maintains high electrostatic chucking forces while minimizing leakage currents, allowing for increased voltage application and reduced substrate warping, even at elevated temperatures.
Implementation Method 1
The seasoning films may include dielectric materials characterized by dielectric constants (κ-values) of greater than or about 3.5
Implementation Method 2
systems and methods of seasoning electrostatic chucks with dielectric seasoning films that permit the chuck to hold a high amount of static charge
Data Source
AI summary
Semiconductor processing systems and method are described that may include flowing deposition precursors into a substrate processing region of a semiconductor processing chamber, where the substrate processing region includes an electrostatic chuck. The methods may further include depositing a seasoning layer on the electrostatic chuck from the deposition precursors to form a seasoned electrostatic chuck. The seasoning layer may be characterized by a dielectric constant greater than or about 3.5. The methods may still further include applying a voltage to the seasoned electrostatic chuck of greater than or about 500 V. The seasoned electrostatic chuck may be characterized by a leakage current of less than or about 25 mA when the voltage is applied.