Stacked Semiconductor Testing Pads for In-Situ Die Screening
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Solution Overview
Problem
Existing semiconductor manufacturing processes face challenges in evaluating the functionality of stacked semiconductor components during fabrication, leading to increased component loss and resource wastage due to defects in individual components or bonding issues.
Innovation Solution
Incorporating test pads on the surface of semiconductor components allows for in-situ evaluation of stacked semiconductor components during various stages of manufacturing, enabling the identification and isolation of defective components without detaching the support structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If stacked semiconductor components are manufactured without in-situ testing capability, then manufacturing process is simpler, but component loss increases due to inability to identify defective components during fabrication
Solution Approach 1:
Test pads are incorporated into the semiconductor component structure during the fabrication process, before the component is complete and before final testing can occur. This preliminary inclusion of testing infrastructure enables in-situ evaluation during manufacturing stages, allowing defective components to be identified early without requiring additional testing infrastructure to be added later.
Solution Approach 2:
Test pads serve as intermediary structures that facilitate communication between the manufacturing testing equipment and the semiconductor component under test. These pads provide accessible contact points on the component surface that enable external testing equipment to evaluate component functionality during fabrication without requiring complex integration or disassembly operations.
2Reliability
If in-situ testing is implemented during stacking operations, then defective components can be identified early, but the manufacturing process becomes more complex
Solution Approach 1:
The testing capability is built into the component structure during fabrication, allowing functionality evaluation to occur at any stage of the manufacturing process including during stacking operations. This preliminary establishment of testing access points enables continuous reliability verification without requiring complex post-fabrication testing setups.
Solution Approach 2:
The semiconductor component includes self-contained test pads that enable the component to be tested in its current state during manufacturing. The component essentially tests itself through these accessible pads, eliminating the need for complex external testing infrastructure or specialized testing equipment integration during the stacking process.
3Measurement precision
If support structure must be detached for testing, then testing can be performed, but manufacturing time increases and productivity decreases
Solution Approach 1:
Test pads are pre-positioned on the component surface in locations that remain accessible during the entire manufacturing process, including while the component is attached to the support structure. This preliminary strategic placement of test pads eliminates the need for support structure detachment or complex repositioning operations to access testing points.
Solution Approach 2:
The test pads act as intermediary access points that bridge the gap between the manufacturing process infrastructure and the component under test. These pads provide direct testing access without requiring physical access to the component through support structure removal, enabling testing to occur in-situ during normal manufacturing operations.
Data Source
AI summary
Methods, systems, and devices for techniques for in-situ testing of stacked semiconductor components are described. A semiconductor system may include a semiconductor unit formed by a first component and one or more second components bonded with a second surface of a first component opposite to a first surface of the first component. The first component may include one or more conductors coupled (e.g., electrically, communicatively) with first circuitry, where each of the conductors may have a respective first interface at the first surface and a respective second interface at another surface of the first component. Each of the one or more second components may include respective second circuitry coupled with the first circuitry and may be configured to be operable based on signaling received via at least one of the one or more conductors of the first component.