Sacrificial Substrate for Glass Interposer Metallization
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Solution Overview
Problem
The handling and processing of thin glass interposers for semiconductor devices are challenging due to their thinness, which makes them difficult to handle and process without proper mechanisms, and the existing metallization processes are time-consuming and costly.
Innovation Solution
A method and system that involves attaching a sacrificial wafer to a metallized surface of the glass substrate, which protects and reinforces the substrate during processing, allowing for the metallization of the opposing surface and providing support through the use of through-holes filled with conductive material and under-bump metallization pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sacrificial wafer is attached to a first surface of the thin glass interposer for protection during processing, then the glass substrate is protected from damage and reinforced, but the manufacturing process becomes more complex with additional steps
Solution Approach 1:
The sacrificial wafer is attached to the first surface before metallization processing begins. This preliminary protective action ensures the metallized surface is already protected when subsequent processing steps are performed on the opposing surface, preventing damage without requiring repeated protective measures throughout the process.
Solution Approach 2:
The sacrificial wafer serves as an intermediary protective layer between the processing environment and the delicate metallized surface. It provides mechanical support and protection during handling and processing, allowing the thin glass interposer to be manipulated safely while the metallized first surface remains shielded.
2Ease of operation
If multiple processing steps are performed on thin glass interposers without proper support mechanisms, then processing flexibility is maintained, but the substrates are prone to damage and handling difficulties arise
Solution Approach 1:
The sacrificial wafer is attached in advance to provide structural support before any processing or handling operations begin. This preliminary reinforcement transforms the fragile thin glass interposer into a handleable assembly with sufficient mechanical strength for safe manipulation throughout the manufacturing process.
Solution Approach 2:
The sacrificial wafer acts as a temporary supportive shell that provides the necessary mechanical strength for handling thin substrates. This external support structure allows the thin glass interposer to be processed with standard equipment and techniques without requiring specialized handling mechanisms.
3Ease of manufacture
If traditional metallization processes are used on thin glass interposers, then metallization can be applied to both surfaces, but the manufacturing time is prolonged and production costs increase
Solution Approach 1:
The sacrificial wafer is attached before metallization, enabling the first surface to be metallized in advance while the wafer provides protection. This preliminary metallization step can be performed before the wafer is removed and the second surface is processed, allowing overlapping operations that reduce total manufacturing time compared to sequential processing.
Solution Approach 2:
The sacrificial wafer enables continuous processing by protecting the metallized first surface while allowing uninterrupted work on the opposing second surface. Both surfaces can be processed in parallel sequences without waiting for one to complete before starting the other, maintaining continuous productive action throughout manufacturing.
Data Source
AI summary
A system for backside metallization and reinforcement of glass substrates to provide support and protection during handling and processing of the glass substrates. A sacrificial substrate is removeably attached to a glass substrate comprising through-holes, backside metallized pads, and under-bump metallization (UBM) pads enclosing the backside metallized pads. The sacrificial substrate comprises a sacrificial layer, an opaque film, and an adhesive. The sacrificial substrate protects the backside metallized pads and UBM pads, and reinforces the glass substrate.