Chamfered Substrate Routing via Plasma Etching
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Solution Overview
Problem
Current methods for recycling chamfered donor substrates in microelectronic and optoelectronic fabrication are costly, complex, and lead to fragile substrates due to excessive material removal, with issues like non-transferred rings causing contamination and defects during annealing and bonding processes.
Innovation Solution
A method involving plasma-based deposition and etching of protective materials on chamfered substrates to create a sharp, perpendicular edge, reducing the peripheral annular zone accessible to plasma, allowing precise removal of material while preserving a protective ring on the front face, thereby enabling efficient routing without increasing defectiveness or costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional recycling methods (grinding and polishing) are used to remove the non-transferred ring and damaged silicon, then the substrate can be reused, but excessive material is removed (close to 5 μm on each face) leading to fragile substrates that become too thin for further recycling
Solution Approach 1:
The patent applies preliminary routing to remove the non-transferred ring and damaged silicon layer BEFORE bonding and layer transfer. This preliminary action eliminates the need for subsequent aggressive material removal during recycling, preserving substrate thickness and integrity for multiple reuse cycles
Solution Approach 2:
The invention extracts and removes only the specific problematic portions (non-transferred ring and damaged silicon) through selective routing, rather than removing large amounts of material through conventional grinding and polishing. This targeted extraction minimizes material loss while achieving the necessary cleaning for substrate reuse
2Manufacturing precision
If double-sided polishing equipment is used to remove material from both faces of the substrate, then more material can be removed uniformly, but the equipment is expensive, bulky, difficult to maintain, and consumes large amounts of polishing slurries and pads
Solution Approach 1:
The patent replaces the mechanical polishing system with a plasma-based routing process. This substitution eliminates the need for expensive, bulky polishing equipment and its consumables (slurries and pads) while achieving precise material removal through controlled plasma etching
Solution Approach 2:
The invention changes the processing parameters from mechanical contact-based removal to plasma-based chemical etching. This parameter change allows for precise, uniform material removal without requiring complex mechanical polishing equipment, reducing both device complexity and operational costs
3Productivity
If the non-transferred ring is left on the substrate after layer transfer, then no additional processing is needed, but the ring causes contamination and defects during annealing and bonding processes
Solution Approach 1:
The patent performs preliminary routing to remove the non-transferred ring before bonding and annealing processes. This preliminary removal prevents the ring from causing contamination and defects during subsequent high-temperature processing, ensuring product quality without sacrificing productivity
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 method results in substrates with sharp, perpendicular edges, reducing material removal and contamination, simplifying recycling, and maintaining substrate integrity and compatibility with SEMI standards, while minimizing equipment and consumable usage.
Implementation Method 1
depositing a layer of a protective material with the aid of a plasma on a peripheral annular zone of a substrate
Implementation Method 2
partially etching the protective material with the aid of a plasma to remove an outer ring of protective material
Implementation Method 3
generating a partial etching plasma, localized at the level of the reduced peripheral annular zone of the substrate, so as to etch the substrate material exposed in the peripheral annular zone
Data Source
AI summary
The invention relates to a method for routing a chamfered substrate, having applications in the field of electronics, optics, or optoelectronics, which involves depositing a layer of a protective material on a peripheral annular zone of the substrate preferably with the aid of a plasma, partially etching the protective material with the aid of a plasma, so as to preserve a protective ring of the deposited material on the front face of the substrate, this ring located at a distance from the edge of the substrate, so as to delimit an accessible peripheral annular zone, etching a thickness of the material constituting the substrate to be routed, preferably with the aid of a plasma that is level with the accessible peripheral annular zone of the substrate, and removing the ring of protective material preferably with the aid of a plasma.