Radiation Sensor Die Visual Marking for Wafer Traceability
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Solution Overview
Problem
Conventional manufacturing techniques for radiation detectors, such as those made of cadmium zinc telluride (CZT), struggle to distinguish individual sensor dies from one another once they are separated from a wafer, leading to the risk of incorporating less than optimally performing dies into detector sub-assemblies, which can result in suboptimal performance.
Innovation Solution
Forming a unique visible identifier on each sub-region of the substrate, which is then incorporated into each radiation sensor die, allowing for easy differentiation between dies sourced from the same wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing techniques are used without visible identifiers, then the manufacturing process is simpler, but individual sensor dies cannot be distinguished from one another leading to quality control issues
Solution Approach 1:
Visible identifiers are formed on the wafer during the manufacturing process before the sensor dies are separated. This preliminary action ensures that each die has its unique identifier already in place, enabling traceability and quality control from the outset without adding complexity to subsequent handling or assembly operations.
Solution Approach 2:
The patent uses visible identifiers that may incorporate color or visual contrast differences to distinguish individual sensor dies. By applying color-coded or visually distinct markers to each die or wafer region, the system enables easy visual differentiation and tracking throughout the manufacturing and assembly process.
2Loss of information
If visible identifiers are formed on each sub-region, then traceability and quality control are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The visible identifiers are formed during the wafer fabrication process itself, before dicing and assembly. This preliminary action integrates the traceability feature into the existing manufacturing flow without requiring separate post-processing steps, thereby maintaining ease of manufacture while ensuring complete traceability.
Solution Approach 2:
The visible identifier system serves multiple functions simultaneously: it provides unique identification for traceability, enables quality control verification, and can indicate wafer batch or manufacturing run information. This multi-functionality reduces the need for separate identification systems and simplifies the overall manufacturing process.
Data Source
AI summary
A method of fabricating radiation sensor dies includes forming a plurality of radiation-sensitive detector elements and a plurality of visible identifiers on at least some of the radiation-sensitive detector elements on a substrate, where each visible identifier is located in a different sub-region of the substrate containing a subset of the radiation-sensitive detector elements, and separating the sub-regions of the substrate from one another to provide a plurality of radiation sensor dies, where the visible identifier on each radiation sensor die uniquely identifies the radiation sensor die with respect to the other radiation sensor dies of the plurality of radiation sensor dies.