Bulk Thinning Detector for Semiconductor Security
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Solution Overview
Problem
Modern semiconductor devices are vulnerable to physical attacks and reverse engineering techniques, such as backside thinning, which compromise their security and structural integrity.
Innovation Solution
Incorporating a bulk thinning detector within the semiconductor device, composed of electrical conducting materials, that detects changes in resistance or disconnection from the ground to identify backside thinning, utilizing a circuit that connects the detector to the ground and includes interconnect layers for electronic components to monitor these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If backside thinning is performed to enable optical attack techniques, then optical access to the device is improved, but device security and structural integrity are compromised
Solution Approach 1:
The patent applies preliminary action by embedding the bulk thinning detector into the semiconductor device structure before any thinning operation occurs. The detector is pre-positioned within the bulk material at a specific depth, creating a protective monitoring system in advance that will detect unauthorized thinning attempts before they can compromise the device's optical security.
Solution Approach 2:
The bulk thinning detector acts as an intermediary element between the device structure and potential optical attacks. It mediates the detection function by monitoring the distance to the bulk surface and generating alerts when unauthorized thinning is detected, thereby protecting the device without directly interfering with legitimate optical operations.
2Measurement precision
If bulk thinning detector is embedded deeper in the bulk to improve detection accuracy, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by positioning the bulk thinning detector at a specific optimal depth within the bulk material, rather than uniformly distributing sensing elements throughout. This localized placement at a critical depth provides precise detection capability for unauthorized thinning while maintaining simple overall device structure and manufacturing processes.
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 solution effectively detects backside thinning attempts, enhancing the security and integrity of semiconductor devices by providing real-time monitoring and potential self-protection mechanisms, such as alerting or erasing sensitive data, thereby preventing unauthorized access.
Implementation Method 1
the bulk thinning detector being a section of the bulk that includes one or more electrical conducting materials, wherein the bulk thinning detector is adapted to be connected to the ground when a part of the bulk material is underneath and contiguous with a portion of the one or more electrical conducting materials in the section
Data Source
AI summary
In one embodiment, a semiconductor device comprises: a bulk comprising a bulk material characterized by a potential designated as a ground, and a bulk thinning detector being a section of the bulk that includes one or more conducting materials. The bulk thinning detector is adapted to be connected to the ground when a part of the bulk material is underneath and contiguous with a portion of the one or more conducting materials in the section. The semiconductor device further comprises: one more electronic components in at least one active layer of the semiconductor device, the one or more electronic components and the bulk thinning detector being included in a circuit for detecting whether there is backside thinning of the semiconductor device by detecting whether at least one of: the bulk thinning detector is disconnected from the ground, or there is a change in resistance of the bulk thinning detector.