Bipolar Electrostatic Chuck Layout for High-Temperature Plasma Tuning
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Solution Overview
Problem
Conventional substrate support systems in semiconductor manufacturing face challenges with temperature-induced electrical issues, substrate movement during processing, and limited plasma tuning capabilities, leading to non-uniformity and potential damage from DC discharges.
Innovation Solution
The substrate support assemblies incorporate a bipolar electrostatic chuck with embedded bipolar electrodes and a heater, allowing for radial tuning and high-temperature operation while maintaining electrostatic chucking, using ceramic materials and RF power supplies for improved plasma control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the substrate support uses internally located heating devices to generate heat, then substrate temperature control is improved, but temperature-induced electrical issues and DC discharges worsen
Solution Approach 1:
The substrate support is divided into functionally independent segments: a heating element for temperature control and separate bipolar electrodes for electrostatic chucking. This segmentation allows the heating function to be isolated from the electrical chucking function, preventing temperature-induced electrical issues from affecting the overall system reliability.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the heating element and the bipolar electrodes. This dielectric barrier prevents direct electrical interference from the heated regions, blocking the pathway for DC discharges while allowing thermal energy to pass through to the substrate.
2Manufacturing precision
If the substrate support uses electrostatic chucking, then substrate positioning is improved, but substrate movement during processing worsens
Solution Approach 1:
The system dynamically adjusts the voltage parameters applied to the bipolar electrodes to maintain optimal electrostatic chucking force across varying temperature conditions. By changing the electrical parameters in response to temperature variations, the substrate remains firmly positioned without movement during processing.
3Adaptability or versatility
If the substrate support is used for both heat generation and plasma generation, then operational versatility is improved, but interference effects and discharge problems worsen
Solution Approach 1:
The substrate support structure is segmented into distinct functional zones: a heating zone with internally located heating devices and a plasma generation zone with bipolar electrodes. This spatial segmentation allows both heat generation and plasma generation functions to operate simultaneously without significant interference, as each function is confined to its designated region.
Solution Approach 2:
A dielectric layer serves as an intermediary barrier between the heating element and the plasma-generating electrodes. This dielectric barrier prevents direct electrical discharge between the heated regions and the plasma regions, eliminating interference effects while preserving both functional capabilities.
4Temperature
If conventional substrate support systems are used at high temperatures, then high-temperature processing capability is improved, but electrical discharge and substrate movement worsen
Solution Approach 1:
The substrate support employs composite material construction, combining materials with different thermal and electrical properties. The bipolar electrodes are made from materials that maintain stable electrical characteristics at high temperatures, while the dielectric layer uses materials with high thermal stability and electrical insulation properties. This composite approach enables reliable electrical operation during high-temperature processing.
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
These assemblies provide stable substrate support during high-temperature processes, reduce substrate movement, and enable radial plasma tuning, enhancing process uniformity and preventing DC discharges, thus improving the quality of semiconductor devices.
Implementation Method 1
Internally located heating devices may generate heat within the support, and the heat may be transferred conductively to the substrate
Implementation Method 2
The substrate support may also be utilized in some technologies to develop a substrate-level plasma, as well as to chuck the substrate to the support electrostatically
Implementation Method 3
The substrate support may also be utilized in some technologies to develop a substrate-level plasma
Data Source
AI summary
Exemplary support assemblies may include an electrostatic chuck body defining a substrate support surface. The substrate support assemblies may include a support stem coupled with the electrostatic chuck body. The substrate support assemblies may include a heater embedded within the electrostatic chuck body. The substrate support assemblies may include a first bipolar electrode embedded within the electrostatic chuck body between the heater and the substrate support surface. The first bipolar electrode may include at least two separated mesh sections, with each mesh section characterized by a circular sector shape. The substrate support assemblies may include a second bipolar electrode embedded within the electrostatic chuck body between the heater and the substrate support surface. The second bipolar electrode may include a continuous mesh extending through the at least two separated mesh sections of the first bipolar electrode.