TSV Test Key Structure for Precise Low-Resistance Via Sensing
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Solution Overview
Problem
It is challenging to monitor the resistance of semiconductor vias (TSVs) due to their low resistance, which complicates the manufacturing process of 3D integrated circuits and packages.
Innovation Solution
The implementation of test keys with resistors and conductors that allow for precise measurement of TSV resistance by creating a voltage drop that facilitates accurate resistance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TSV resistance measurement is attempted directly, then the measurement should be simple, but the low resistance of TSVs makes accurate measurement difficult
Solution Approach 1:
The patent introduces test keys as intermediary structures that include known resistors and conductors connected to the TSV. These test keys serve as mediators between the measurement instrument and the TSV, enabling accurate resistance measurement by providing reference values and creating measurable voltage drops that are proportional to the TSV resistance.
Solution Approach 2:
The patent replaces direct electrical measurement of low-resistance TSVs with an indirect measurement system using test keys. Instead of measuring the TSV resistance directly, the system measures voltage drops across known test key components and calculates TSV resistance through comparison and computation, substituting direct measurement with an indirect computational approach.
2Measurement precision
If test structures are added to measure TSV resistance, then measurement accuracy improves, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the test key structures with the existing TSV fabrication process by forming test key conductors and resistors using the same manufacturing steps as the TSV interconnect structure. The test keys are integrated into the same die structure and fabrication sequence, combining testing functionality with the primary device manufacturing without requiring separate process lines.
Solution Approach 2:
The test keys serve multiple functions: they provide resistance measurement capability, enable process monitoring, and can be used for electrical continuity verification. This multi-functionality reduces the need for separate dedicated test structures and allows a single set of test keys to perform multiple measurement tasks, thereby reducing overall 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
This solution enables precise measurement of TSV resistance, improving the accuracy of fabrication yields and enhancing the reliability of 3D packaging and integrated circuits.
Implementation Method 1
The implementation of test keys with resistors and conductors that allow for precise measurement of TSV resistance by creating a voltage drop that facilitates accurate resistance calculation
Data Source
AI summary
A test key configured to measure resistance of a through semiconductor via in a semiconductor substrate is provided. The test key includes a first resistor, a first conductor, a first probe pad, a second conductor, a second probe pad, a third conductor, a third probe pad, a fourth conductor, and a fourth probe pad. The first probe pad is electrically connected to a first end of the through semiconductor via by the first resistor and the first conductor. The second probe pad is electrically connected to the first end of the through semiconductor via by the second conductor. The third probe pad is electrically connected to a second end of the through semiconductor via by the third conductor. The fourth probe pad is electrically connected to the second end of the through semiconductor via by the fourth conductor.