Electrostatic Chuck Voltage Regulation to Prevent Wafer Arcing
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Solution Overview
Problem
Electrical arcing between a semiconductor substrate and components of a semiconductor processing tool can occur due to uneven electrical potential, leading to damage to both the substrate and the tool, reducing yield and increasing downtime.
Innovation Solution
A voltage-regulation system is implemented, which includes electrically-conductive pins that can be positioned and charged to regulate the electrical potential on the substrate, ensuring it meets a threshold and preventing arcing by neutralizing or reducing the potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic chuck is used to support the semiconductor substrate, then the substrate can be temporarily captured and positioned for processing and inspection, but electrical arcing may occur between the substrate and tool components due to uneven electrical potential
Solution Approach 1:
Conductive pins are introduced as intermediary elements between the electrostatic chuck and the substrate. These pins make direct contact with the substrate backside to equalize electrical potential and prevent arcing, while the ESC continues to provide electrostatic holding force through the same pins, thus mediating both mechanical support and electrical stabilization functions
Solution Approach 2:
The conductive pins are electrically connected to the substrate and the electrostatic chuck, creating an equipotential path that equalizes electrical potential between the substrate and tool components. This eliminates potential differences that would otherwise cause electrical arcing, while maintaining the electrostatic holding force necessary for substrate positioning
2Object-affected harmful factors
If conductive pins are added to regulate electrical potential, then electrical arcing is prevented, but the device complexity increases
Solution Approach 1:
The conductive pins serve multiple functions simultaneously: they provide mechanical support by transmitting electrostatic holding forces from the ESC to the substrate, regulate electrical potential to prevent arcing, and enable direct electrical contact for voltage control. This multi-functionality reduces the need for separate components and simplifies the overall system architecture
Solution Approach 2:
The invention merges the mechanical support function and electrical potential regulation function into a single integrated component structure. The conductive pins that provide mechanical contact also serve as the electrical pathway for voltage control, combining what could have been separate systems into one unified mechanism that reduces overall device complexity
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 system effectively reduces the likelihood of electrical arcing, thereby protecting the semiconductor substrate and processing tool, enhancing yield and uptime while increasing throughput.
Implementation Method 1
an electrostatic chuck (ESC) that supports a semiconductor substrate for processing
Implementation Method 2
the one or more electrically-conductive pins transfer an electrical charge to or from the semiconductor substrate to change an electrical potential
Implementation Method 3
one or more electron beams of the SEM may scan the semiconductor substrate for defects
Data Source
AI summary
Some implementations described herein provide techniques and apparatuses for a semiconductor processing tool including an electrostatic chuck having a voltage-regulation system to regulate an electrical potential throughout regions of a semiconductor substrate positioned above the electrostatic chuck. The voltage-regulation system may determine that an electrical potential within a region of the semiconductor substrate does not satisfy a threshold. The voltage-regulation system may, based on determining that the electrical potential throughout the region does not satisfy the threshold, position one or more electrically-conductive pins within the region. While positioned within the region, the one or more electrically-conductive pins may change the electrical potential of the region.