Optical Electrostatic Field Mapping for Semiconductor ESD Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies lack effective methods for accurately measuring electrostatic field strengths and detecting electrostatic events on semiconductor fabrication components, which can lead to potential electrostatic discharge (ESD) events and charge accumulation, posing risks to semiconductor device manufacturing processes.
Innovation Solution
An electrostatic field strength measuring apparatus utilizing a ring light source and reflection detector system that generates and detects second harmonic light to measure electrostatic field strengths, enabling detection of electrostatic events such as charge accumulation and hotspots through a processor that generates electrostatic field strength maps and images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrostatic measurement methods are used, then the measurement process is simple, but the measurement precision is insufficient to accurately detect electrostatic field strengths and potential ESD events
Solution Approach 1:
The patent introduces a light source and optical detection system as an intermediary mechanism to measure electrostatic field strength. The light source emits light that interacts with the electrostatic field, and the detection system captures these interactions to derive field strength measurements, thereby achieving high precision without direct electrical contact that would complicate the measurement setup
Solution Approach 2:
The patent replaces traditional electrical or mechanical electrostatic measurement systems with an optical-based measurement system. By using light interaction with the electrostatic field instead of direct electrical probes, the system achieves accurate measurements while avoiding the complexity and potential interference associated with conventional electrical measurement apparatus
2Reliability
If no electrostatic detection system is implemented, then the device complexity is low, but the reliability of semiconductor fabrication processes deteriorates due to undetected ESD events and charge accumulation
Solution Approach 1:
The patent implements preliminary detection of electrostatic field strengths and potential ESD events before they can cause damage to semiconductor devices. By continuously monitoring the electrostatic environment in the fabrication process, the system identifies hazardous conditions in advance, allowing for preventive actions to be taken before reliability is compromised
Solution Approach 2:
The optical detection system serves as an intermediary between the electrostatic field and the measurement apparatus, enabling reliable detection of electrostatic conditions without introducing complex electrical measurement systems into the sensitive semiconductor fabrication environment. This indirect measurement approach maintains process reliability while managing system complexity
3Difficulty of detecting and measuring
If comprehensive electrostatic field mapping is performed, then the detection capability for electrostatic events is improved, but the measurement time and productivity are reduced
Solution Approach 1:
The patent implements periodic or targeted electrostatic field measurements rather than continuous comprehensive mapping. The system performs measurements at critical points in the fabrication process or when specific conditions are triggered, maintaining high detection capability for electrostatic events while minimizing the time consumed and preserving productivity
Solution Approach 2:
The patent focuses electrostatic measurement efforts on specific critical areas or components within the fabrication process where ESD events are most likely to occur or cause the greatest damage. By concentrating measurement resources on these high-risk locations rather than performing comprehensive universal mapping, the system achieves effective detection capability while maintaining overall process productivity
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 apparatus provides precise measurements of electrostatic field strengths and detects potential ESD events, enhancing the safety and efficiency of semiconductor fabrication processes by identifying and mitigating electrostatic risks.
Implementation Method 1
The light of the light signal being reflected by the surface generates one or more additional harmonics in the reflection signal, such as due, at least in part, by second harmonic generation that occurs when the light signal is reflected by the surface
Implementation Method 2
The reflection detector is configured to receive a reflection signal including light, of the light signal, reflected by a surface of the target object
Data Source
AI summary
An electrostatic field strength measuring apparatus includes an electrostatic field detection device and a processor. The electrostatic field detection device includes a ring-shaped light source configured to emit a light signal to a target object, and a reflection detector disposed within and surrounded by the ring-shaped light source and configured to receive a reflection signal, of the light signal, reflected by a surface of the target object and generate an electrical signal based upon the reflection signal. The processor is configured to determine, based upon the electrical signal, measures of electrostatic field strength at the surface of the target object.