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Proceedings Paper

Investigation of electroless Ni(P)/Pd/Au metallization for solder joining of optical assemblies using laser-based solderjet bumping
Author(s): Thomas Burkhardt; Max Mäusezahl; Marcel Hornaff; Oliver de Vries; Jan Kinast; Christoph Damm; Erik Beckert
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Paper Abstract

Solder joining is an all inorganic, adhesive free bonding technique for optical components and support structures of advanced optical systems. We established laser-based Solderjet Bumping for mounting and joining of elements with highest accuracies and stability. It has been proven for optical assemblies operating under harsh environmental conditions, high energetic or ionizing radiation, and for vacuum operation. Spaceborne instrumentation experiencing such conditions and can benefit from inorganic joining to avoid adhesives and optical cements. The metallization of components, necessary to provide solder wetting, mainly relies on well-adhering layer systems provided by physical vapor deposition (PVD). We present the investigation of electroless Ni(P)/Pd/Au plating as a cost-efficient alternative under bump metallization of complex or large components unsuitable for commercially available PVD. The electroless Ni(P)/Pd/Au plating is characterized with respect to layer adherence, solderability, and bond strength using SnAg3Cu0.5 lead-free solder alloy.

Paper Details

Date Published: 22 February 2017
PDF: 8 pages
Proc. SPIE 10097, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI, 100970D (22 February 2017); doi: 10.1117/12.2254752
Show Author Affiliations
Thomas Burkhardt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Max Mäusezahl, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Marcel Hornaff, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Oliver de Vries, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Jan Kinast, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Christoph Damm, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Erik Beckert, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 10097:
High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI
Stefan Kaierle; Stefan W. Heinemann, Editor(s)

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