Substrate Inspection Temperature Control for Probe Alignment
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Solution Overview
Problem
Existing inspection systems face challenges in accurately controlling the temperature of substrates during electrical characteristics inspections, leading to potential yield deterioration and probe misalignment due to thermal expansion differences and heat disturbances, which affect the precision of electrical characteristics measurements.
Innovation Solution
An inspection system with integrated temperature control mechanisms, including a substrate holder and detector, uses a controller to adjust temperatures via heaters and chillers, and employs a heat flow model and observer to estimate and maintain the junction temperature of electronic devices, ensuring precise temperature control and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If temperature control mechanisms are added to the inspection system, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The temperature control system is segmented into two independent control mechanisms: a substrate holder temperature adjustment mechanism and a detector temperature adjustment mechanism. Each mechanism independently controls the temperature of its respective component, allowing precise temperature management without requiring a single complex centralized control system. This segmentation resolves the contradiction by distributing temperature control functions across separate mechanisms.
Solution Approach 2:
The inspection system incorporates temperature detection sensors that continuously monitor the temperatures of both the substrate holder and detector. These temperature signals are fed back to the control unit, which automatically adjusts the heating or cooling actions to maintain desired temperature conditions. This feedback mechanism enables precise temperature control while keeping the system relatively simple through automated regulation.
2Measurement precision
If temperature control mechanisms are added to the inspection system, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system separates temperature control into two independent mechanisms: one for the substrate holder and another for the detector. This segmentation allows each mechanism to be optimized for its specific function, improving measurement precision by maintaining stable temperatures at both the substrate and detector, while avoiding the complexity of a single integrated control system.
Solution Approach 2:
Temperature detection sensors provide continuous feedback on the temperatures of both the substrate holder and detector. The control unit uses this feedback to automatically adjust temperature conditions, ensuring stable measurement environments and high measurement precision without requiring overly complex manual control systems.
3Device complexity
If thermal expansion differences are not controlled, then device simplicity is maintained, but manufacturing precision deteriorates
Solution Approach 1:
By segmenting temperature control into separate mechanisms for the substrate holder and detector, the system can independently compensate for thermal expansion differences between these components. Each mechanism maintains its component at the appropriate temperature, preventing misalignment due to differential thermal expansion while keeping the overall system design relatively simple.
Solution Approach 2:
The system actively changes and maintains temperature parameters of both the substrate holder and detector to compensate for thermal expansion effects. By controlling temperatures within specific ranges, the system prevents probe misalignment that would otherwise occur due to thermal expansion differences, maintaining manufacturing precision without excessive 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 enables accurate temperature control, preventing yield deterioration and probe misalignment, thereby enhancing the precision of electrical characteristics inspections and reducing costs by minimizing the need for additional temperature sensors.
Implementation Method 1
a holder temperature adjustment mechanism configured to detect a temperature of the substrate holder and adjust the temperature of the substrate holder
Implementation Method 2
a detector temperature adjustment mechanism configured to detect a temperature of the detector and adjust the temperature of the detector
Implementation Method 3
uses a controller to adjust temperatures via heaters and chillers
Implementation Method 4
uses a controller to adjust temperatures via heaters and chillers
Data Source
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AI summary
Provided are an inspection system and a temperature control method for inspecting a substrate while performing appropriate temperature control. The inspection system, which inspects a substrate while performing temperature control, includes a substrate holder that holds the substrate; a detector that supplies inspection power to an electrode of the substrate; a holder temperature adjustment mechanism that detects a temperature of the substrate holding unit, and adjusts the temperature of the substrate holder; a detector temperature adjustment mechanism that detects a temperature of the detector, and adjusts the temperature of the detector; and a controller. The controller adjusts the temperature control performed by the holder temperature adjustment mechanism and the detector temperature adjustment mechanism while the substrate is being inspected.