Removable Indicator Structure for Etch Endpoint Detection
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Solution Overview
Problem
Conventional methods for processing electronic chips lack precision and accuracy in material removal, leading to variations in thickness and quality, especially during plasma etching, which complicates the production of thin semiconductor structures required for advanced applications.
Innovation Solution
Incorporating an indicator structure within the electronic chips that is detectable by analyzing volatile matter generated during the etching process, allowing for real-time adjustment of the etching procedure to ensure precise material removal and endpoint detection, thereby eliminating the need for guesswork and enhancing process control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching methods are used for material removal, then processing simplicity is maintained, but manufacturing precision deteriorates due to lack of accurate endpoint detection
Solution Approach 1:
An indicator structure is embedded within the electronic chip before the etching process begins. This indicator structure is positioned at the desired endpoint depth and is designed to be detectable by analyzing volatile matter generated during etching. By preparing this indicator structure in advance, the system enables precise endpoint detection without requiring complex real-time measurement equipment, thus improving manufacturing precision while keeping the processing architecture relatively simple.
Solution Approach 2:
The indicator structure serves as an intermediary element between the etching process and the detection system. Instead of directly measuring the etching depth or material removal, the system detects volatile matter released by the indicator structure when it is exposed or removed during etching. This intermediary approach simplifies the detection mechanism while providing accurate endpoint information, resolving the contradiction between precision and complexity.
2Manufacturing precision
If material removal is performed without real-time detection, then processing time is reduced, but manufacturing precision deteriorates due to inability to determine etch endpoint
Solution Approach 1:
The system implements feedback by continuously monitoring volatile matter during the etching process. When the indicator structure is exposed or removed, it releases characteristic volatile matter that is detected by the analysis system. This feedback signal indicates the etch endpoint has been reached, allowing the process to be stopped at the precise moment rather than using fixed timing, thus improving material removal accuracy without significant time loss.
Solution Approach 2:
The patent replaces mechanical or physical endpoint detection methods (such as direct measurement of chip thickness or visual inspection) with a chemical detection method that analyzes volatile matter. This substitution enables real-time, non-contact detection of the etch endpoint, providing both high precision and rapid response, thereby resolving the trade-off between accuracy and processing time.
3Manufacturing precision
If indicator structure is embedded for endpoint detection, then manufacturing precision is improved, but device complexity increases due to additional structure
Solution Approach 1:
The indicator structure is designed to serve multiple functions: it acts as an endpoint marker for etching detection, and simultaneously can serve as part of the chip's functional structure or be integrated with existing chip layers. By making the indicator structure multi-functional, the patent minimizes the additional complexity introduced while maintaining high endpoint detection accuracy, as the same structure provides both indication and potential functional roles.
Solution Approach 2:
The indicator structure is localized to specific regions within the chip where endpoint detection is needed, rather than requiring a complete structural modification of the entire chip. This localized approach allows precise endpoint detection to be achieved with minimal additional complexity, as only specific areas contain the indicator structure, and it can be integrated with existing local chip features.
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 approach enables highly accurate thinning of electronic chips with defined properties, reducing material variations and improving the precision of semiconductor structures, which is crucial for applications like power electronics and microelectromechanical systems (MEMS), by providing a reliable and reproducible method for determining the etch endpoint.
Implementation Method 1
plasma etching the electronic chips simultaneously
Implementation Method 2
the indicator layer is configured to be at least partially removable by plasma etching so that its plasma etching product impacts volatile matter
Data Source
AI summary
A method of processing a plurality of packaged electronic chips being connected to one another in a common substrate is provided, wherein the method comprises etching the electronic chips, detecting information indicative of an at least partial removal of an indicator structure following an exposure of the indicator structure embedded within at least a part of the electronic chips and being exposed after the etching has removed chip material above the indicator structure, and adjusting the processing upon detecting the information indicative of the at least partial removal of the indicator structure.