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3-D Thin film interposer based on TGV (Through Glass Vias): An alternative to Si-interposer

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9 Author(s)
Michael Töpper ; Fraunhofer Institute for Reliability and Microintegration (Fraunhofer IZM), Gustav-Meyer-Allee 25, 13355 Berlin/Germany ; Ivan Ndip ; Robert Erxleben ; Lars Brusberg
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Interposers for SiP will become more and more important for advanced electronic systems. But through substrate vias are essential for the 3-D integration. Being a standard for laminate based materials this is much more complex for Si-wafers: High speed etching has to be combined with complex electrical isolation, diffusion barriers and void-free Cu-filling. Without doubt this can be solved in lab-scale but for high production scale cost is a tremendous barrier. Glass wafers with W-plugs have been intensively investigated in this paper. A new acronym has been posted to high-light this technology: TGV for Through Glass Vias. The results of modeling and simulation of TGV at RF/Microwave frequencies showed a very good compromise between wafer thickness, TGV-shape and via diameter for vertical metal plugs with 100 μm diameters in 500 μm thick glass wafer still very stable for thin film wafer processing without costly temporary wafer bonding processes. Therefore the HermeS® from Schott was chosen as the basis for a prototype of a bidirectional 4 × 10 Gbps electro-optical transceiver module. Thin film RDL and bumping of these wafers was possible without any modifications to Si-wafer. First thermal cycles showed very promising results for the reliability of this concept.

Published in:

2010 Proceedings 60th Electronic Components and Technology Conference (ECTC)

Date of Conference:

1-4 June 2010