On-Chip Crack Detector Circuit for Low-k Die Reliability
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Solution Overview
Problem
The challenge in semiconductor manufacturing is detecting cracks in low-k dielectric materials used in semiconductor devices, as these materials are prone to cracking during manufacture, affecting device performance and reliability.
Innovation Solution
A crack detector unit (CDU) is introduced, comprising a switching circuit, a crack sensor, and a logic circuit, which enables crack detection by switching between normal and crack detection modes, using a metal-oxide-semiconductor field-effect transistor (MOSFET) and a metal pattern sensor to identify cracks within semiconductor dies or packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional external testing methods are used to detect cracks in semiconductor devices, then crack detection capability is provided, but device complexity and manufacturing cost increase due to additional test pads and external testing infrastructure
Solution Approach 1:
The patent combines the crack sensor, switching circuit, and logic circuit into a single integrated crack detector unit (CDU) that is fully incorporated onto the semiconductor die. This merging eliminates the need for separate external testing equipment and additional test pads, as the detection functionality is unified within the device itself through integration of all detection components.
Solution Approach 2:
The semiconductor device performs crack detection autonomously through the built-in CDU that continuously monitors for cracks using the metal pattern sensor and evaluation logic. The device self-diagnoses structural integrity issues without requiring external testing infrastructure, enabling the device to service its own detection needs internally.
2Ease of manufacture
If crack detection functionality is integrated onto the semiconductor die, then additional on-chip components are required, but external testing equipment and infrastructure are eliminated
Solution Approach 1:
The patent merges the crack sensor, switching circuit, and logic circuit into a single integrated crack detector unit (CDU) that is fully incorporated onto the semiconductor die. This merging eliminates the need for separate external testing equipment and additional test pads, as the detection functionality is unified within the device itself through integration of all detection components.
3Reliability
If low-k dielectric materials are used in semiconductor devices, then device performance is improved, but susceptibility to cracking during manufacture increases
Solution Approach 1:
The patent implements a metal pattern sensor and crack detector unit that proactively monitor for cracks in low-k dielectric materials during and after manufacturing processes. By establishing detection capability before cracks cause device failure, the system enables early identification and prevention of crack-related reliability issues in these susceptible materials.
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 CDU effectively detects cracks in semiconductor devices, enabling accurate identification and diagnosis of defects, improving device reliability and performance by integrating a fully on-chip built-in-self-test (BIST) capability without the need for additional test pads.
Implementation Method 1
a metal pattern sensor to identify cracks within semiconductor dies or packages
Data Source
AI summary
The present disclosure provides a crack detection unit (CDU), a semiconductor die, and a method of detecting a crack of a semiconductor die. The CDU comprises a switching circuit, a crack sensor, and a logic circuit. The switching circuit is configured to enable the crack sensor. The crack sensor is configured to be electrically connected to the switching circuit, the ground, and an operating voltage. The logic circuit is configured to be electrically connected to the switching circuit and the crack sensor, wherein the CDU is enabled based on an input of the logic circuit. The output of the logic circuit indicates whether the crack sensor contains a crack.