Scanning Surface Chemical Analyzer for Substrate Contamination Mapping
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Solution Overview
Problem
Current production capabilities lack the ability to effectively map and identify the spatial distributions of chemical contaminants across electronic device substrates, which are crucial for understanding and eliminating defects in shrinking electronic device components.
Innovation Solution
A scanning surface chemical analyzer equipped with an array of chemical sensors, a scanning mechanism, and an optional desorption mechanism to detect and map chemical distributions on electronic device substrates, utilizing miniature quadrupole mass spectrometers for precise chemical detection and generating detailed distribution maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional production capabilities are used, then manufacturing process is simple, but chemical contamination mapping capability is nonexistent
Solution Approach 1:
The system divides the substrate into a grid of discrete regions and uses an array of spatially distributed sensors to independently measure each region. This segmentation allows parallel measurement across the entire substrate surface, enabling comprehensive chemical contamination mapping while maintaining manageable system complexity through modular sensor architecture.
Solution Approach 2:
The invention transitions from traditional point-by-point or line-by-line scanning approaches to a two-dimensional array of sensors that simultaneously sample multiple locations across the substrate surface. This dimensional expansion from 1D scanning to 2D parallel measurement dramatically improves measurement capability while distributing system complexity across multiple independent sensor elements.
2Measurement precision
If sensor array is positioned close to substrate, then chemical detection sensitivity is improved, but risk of contamination transfer increases
Solution Approach 1:
The system introduces a controlled gas flow field as an intermediary medium between the sensor array and substrate surface. This gas flow serves multiple functions: it transports volatile chemicals from the substrate to the sensors for detection, maintains the close proximity needed for sensitivity, and creates a controlled barrier that prevents direct contact and potential contamination transfer between sensor and substrate.
Solution Approach 2:
The invention employs pneumatic control through gas flow to achieve close sensor-to-substrate positioning without physical contact. By using gas dynamics to transport chemical species and maintain the measurement interface, the system achieves high detection sensitivity while eliminating mechanical contact that could cause contamination transfer.
3Adaptability or versatility
If multiple types of chemicals are detected, then comprehensive contamination analysis is achieved, but sensor array complexity increases
Solution Approach 1:
The system employs sensors with broad spectral response characteristics that can detect multiple types of chemical contaminants simultaneously. Each sensor in the array is designed to respond to a wide range of chemical species, allowing comprehensive contamination analysis across the substrate without requiring specialized sensors for each chemical type, thus maintaining relatively simple sensor architecture.
Solution Approach 2:
The invention achieves detection of multiple chemical types by varying operational parameters of the sensors, such as temperature, gas flow conditions, or sensor activation states, rather than using physically different sensor types. This parameter-based differentiation allows a single sensor design to detect multiple chemicals through controlled changes in measurement conditions.
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
Enables the identification of chemical contaminants and defects on electronic device substrates, providing valuable insights for reducing contamination and improving production yields by offering high spatial resolution and comprehensive chemical mapping capabilities.
Implementation Method 1
the sensor array is an array of miniature quadrupole mass spectrometers
Implementation Method 2
an optional desorption mechanism to amplify or increase the flow of chemicals from the substrate surface into the sensor array
Data Source
AI summary
Reducing chemical contaminants is increasingly important for maintaining competitive production costs during fabrication of electronic devices. There is currently no production floor capability for mapping chemical contaminants across an electronic device substrate on a routine basis. A scanning surface chemical analyzer for mapping the distributions of a variety of chemicals on substrates is disclosed. The analyzer includes an array of sensors, each of which detects a single chemical or narrow range of chemicals, a scanning mechanism to provide a mapping capability, an electrical signal analyzer to collect and analyze signals from the array of sensors and generate reports of chemical distributions, and an optical desorption mechanism to amplify detection. A preferred embodiment includes an array of miniature quadrupole mass spectrometers in the sensor array. Scanning modes include whole substrate mapping, region sampling, and spot sampling of known defect sites.