Crystalline Substrate Edge Groove Structure for Thin Wafer Splitting
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Solution Overview
Problem
Current methods for manufacturing crystalline substrates face challenges in reducing substrate thickness for improved device characteristics and cost-effectiveness, while also dealing with edge effects that can lead to chipping and fractures.
Innovation Solution
A method involving a parent substrate with a central region and an edge region, where a detachment layer is formed in the central region parallel to the main surface and a groove is created in the edge region to laterally enclose the central region, allowing for the substrate to be split into device and reclaim substrates with reduced edge effects and improved handling stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the substrate thickness is reduced to improve device characteristics, then the on-state resistance decreases, but the substrate becomes more prone to chipping and fractures at edges
Solution Approach 1:
The substrate is divided into a central region and an edge region with different structural characteristics. The edge region includes a groove structure that segments the continuous substrate material, creating a stepped configuration that reinforces edge stability while allowing the central region to maintain reduced thickness for improved device performance.
Solution Approach 2:
Different regions of the substrate are given different structural qualities: the central region has reduced thickness for optimal electrical characteristics, while the edge region incorporates grooves and stepped structures for enhanced mechanical strength and chip resistance. This local differentiation resolves the contradiction between thinness and edge strength.
2Strength
If standard substrates are used to ensure structural integrity, then edge strength is maintained, but the substrate thickness cannot be reduced for cost-effective thin device manufacturing
Solution Approach 1:
The groove structure segments the substrate into functional zones, allowing the central region to be thinned for cost-effective thin device manufacturing while the edge region maintains structural integrity through the stepped configuration. This enables thin substrate manufacturing without sacrificing edge strength.
Solution Approach 2:
The groove structure is formed in advance during substrate fabrication, creating preliminary structural reinforcement at the edges before the substrate is thinned. This preliminary action ensures edge strength is established before subsequent thinning processes, enabling cost-effective manufacturing of thin substrates.
3Strength
If chamfering is applied to reduce chipping, then edge strength is improved, but additional manufacturing steps are required increasing complexity
Solution Approach 1:
The groove formation and chamfering operations are merged into a single integrated process step. The groove structure inherently provides the chamfered configuration, eliminating the need for separate chamfering steps and reducing manufacturing process complexity while maintaining edge strength enhancement.
Solution Approach 2:
The groove structure segments the edge region to provide both mechanical reinforcement and chamfered geometry simultaneously. This segmentation approach achieves edge strength improvement through structural design rather than additional processing steps, reducing manufacturing complexity.
Data Source
AI summary
Provided is a machining apparatus including a profile sensor unit configured to obtain shape information about a parent substrate; and a laser scan unit configured to direct a laser beam onto the parent substrate, wherein a laser beam axis of the laser beam is tilted to an exposed main surface of the parent substrate, and wherein a track of the laser beam on the parent substrate is controllable as a function of the shape information obtained from the profile sensor unit.