Thinned Wafer Carrier Support for Breakage Prevention
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Solution Overview
Problem
The manufacturing of thinner semiconductor wafers and components is challenging due to their low thickness, which complicates processing and increases the risk of breakage and warpage, especially when current flows vertically through the wafer.
Innovation Solution
A method involving a layer stack with a carrier and a thinned wafer having a metallization layer, where the wafer is encapsulated and the carrier is thinned from the opposite side, allowing for further processing and reducing the risk of breakage by providing mechanical stability and enabling metallization on both sides of the wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the wafer thickness is reduced to below 20 micrometers, then the component meets the trend for thinner semiconductor components, but the processing difficulty and risk of breakage increase significantly
Solution Approach 1:
A carrier substrate is introduced as an intermediary support structure during the metallization process. The thin wafer is bonded to this carrier, which provides mechanical strength and stability during processing. After metallization is completed on the thin wafer, the carrier can be removed, leaving the thin component intact. This mediator approach enables processing of ultra-thin wafers that would otherwise be too fragile to handle.
Solution Approach 2:
The method applies protective measures in advance by bonding the thin wafer to a carrier substrate before any subsequent processing steps. This pre-established support structure cushions the thin wafer against mechanical stresses, vibrations, and handling damage that would occur during metallization and other manufacturing processes, thereby preventing breakage before it can occur.
2Length of moving object
If the wafer thickness is reduced to below 20 micrometers, then the component achieves the desired thin profile, but warpage and handling difficulty increase
Solution Approach 1:
The carrier substrate serves as a mediator that improves handling ease during manufacturing processes. While the final product remains thin, the carrier provides a robust platform for gripping, transporting, and processing the thin wafer without causing deformation or damage. This temporary support structure makes ultra-thin components as easy to handle as thicker ones during production.
Solution Approach 2:
The effective thickness parameter of the component is dynamically changed during processing. During manufacturing, the component exists as a composite structure with increased effective thickness (wafer + carrier), improving handleability. After processing, the carrier is removed, restoring the original thin profile. This parameter change allows the component to have different mechanical properties at different stages of production.
3Adaptability or versatility
If metallization is applied to both sides of the wafer, then the component functionality is improved, but the processing complexity increases due to the thin thickness
Solution Approach 1:
The carrier substrate enables metallization on both sides of the thin wafer by providing stable support during each metallization step. The wafer is first metallized on one side while supported by the carrier, then the carrier can be temporarily removed or repositioned to allow metallization on the opposite side. This intermediary support makes dual-sided metallization of ultra-thin wafers feasible without excessive complexity.
Solution Approach 2:
The wafer is metallized on one side while still supported by the carrier substrate, before the carrier is removed. This preliminary metallization action is performed when the wafer has maximum mechanical support, making the process simpler and more reliable. Subsequent steps can then proceed with the already-metallized thin wafer, reducing overall processing complexity.
Data Source
AI summary
Various embodiments provide method of manufacturing a semiconductor component, wherein the method comprises providing a layer stack comprising a carrier and a thinned wafer comprising a metallization layer on one side, wherein the thinned wafer is placed on a first side of the carrier; forming an encapsulation encapsulating the layer stack at least partially; and subsequently thinning the carrier from a second side of the carrier, wherein the second side is opposite to the first side of the carrier.