Electrostatic Chuck Pin Positioning for Local Potential Regulation
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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 that positions electrically-conductive pins within the substrate's region to adjust and maintain an electrical potential within a threshold, preventing arcing by neutralizing or reducing the potential, using a combination of pin-positioning and power supply control.
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, but electrical arcing may occur between the substrate and tool components due to uneven electrical potential
Solution Approach 1:
The patent applies local quality by placing conductive pins at specific locations on the electrostatic chuck surface where electrical potential needs to be regulated. These pins create localized electrical contact points that neutralize charge buildup in specific regions, allowing different areas of the substrate to have different electrical characteristics as needed to prevent arcing while maintaining overall positioning stability.
Solution Approach 2:
The conductive pins serve as intermediaries between the electrostatic chuck and the semiconductor substrate. They mediate the electrical interaction by providing controlled charge transfer pathways, allowing the system to regulate electrical potential without direct substrate-chuck contact that would cause arcing. The pins act as a buffer that manages the electrical interface.
2Object-affected harmful factors
If conductive pins are positioned within the substrate region to regulate electrical potential, then electrical arcing is prevented, but the device complexity increases
Solution Approach 1:
The voltage regulation system operates autonomously by continuously monitoring electrical potential through sensors and automatically adjusting pin positions and charges without external intervention. The system self-regulates by detecting potential issues and correcting them in real-time, reducing the need for complex external control mechanisms while maintaining effective arcing prevention.
Solution Approach 2:
The patent changes electrical parameters dynamically by adjusting the position, charge, and configuration of conductive pins based on real-time measurements of electrical potential. This parameter adjustment approach allows the system to adapt to varying conditions and prevent arcing without requiring a completely complex system architecture, as the same pins can be reconfigured for different regulatory needs.
3Reliability
If voltage regulation is continuously monitored and adjusted, then electrical arcing is prevented and yield increases, but the operation time and processing duration increase
Solution Approach 1:
The voltage regulation system uses periodic monitoring and adjustment cycles rather than continuous operation. Sensors periodically measure electrical potential, and the control system makes adjustments at intervals when needed. This periodic approach maintains effective arcing prevention while allowing normal processing to proceed uninterrupted during regulation cycles, minimizing time loss.
Solution Approach 2:
The system rapidly performs voltage regulation adjustments and quickly returns to normal processing mode. When electrical potential issues are detected, the system rushes through the correction process by quickly positioning and charging pins, then immediately resuming substrate processing. This minimizes the time spent in regulation mode while ensuring arcing is prevented.
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 solution effectively reduces the likelihood of electrical arcing, thereby increasing the yield of semiconductor devices, maintaining tool uptime, and enhancing manufacturing throughput by ensuring the electrical potential satisfies a predetermined threshold.
Implementation Method 1
an electrostatic chuck (ESC) that supports a semiconductor substrate for processing
Implementation Method 2
one or more electron beams of the SEM may scan the semiconductor substrate for defects
Implementation Method 3
position one or more electrically-conductive pins within the region. The one or more electrically-conductive pins may change the electrical potential of the region
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.