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Development of a Scalelable Interconnection Technology for Nano Packaging

K.-F. Becker, T. Löher, B. Pahl, O. Wittler, R. Jordan, J. Bauer, R. Aschenbrenner, H. Reichl
Fraunhofer IZM, DE

Keywords:
interconnection technology, reactive interconnect, CNT enhanced

Abstract:
Microelectronics miniaturization is following Moore’s law since the mid sixties and over the years it has always been possible to follow it without meeting fundamental technological limits. This might be in question for future applications, where SIA roadmap shows a red brick wall for the further development of microelectronics without fundamentally new approaches. These new approaches lead to increased interconnect density and thus to a miniaturization of the individual contact. Parallel to the miniaturization of the interconnects the development of scaleable interconnect technology is necessary, providing reliable infrastructure for future packaging needs. At Fraunhofer IZM various approaches towards a scaleable interconnect technology are researched. This paper will describe the development of reactive interconnects, i.e. contacts that need no external energy source, but release the energy for solder interconnect formation by exothermic reaction of a nano-enhanced encapsulant. Potential areas of application are interconnection of thermally sensitive devices as bio sensors or interconnection on low cost substrates, e.g. for the smart card applications or the expanding RF ID tag market. The technological developments for the realization of reactive interconnects are described, including interconnect bumping, reactant application and interconnect formation. These technological processes are backed by thermal simulation. A process flow is given, illustrating the integrateability of this technology into today’s manufacturing lines. Summarized, this paper shows the potential of reactive interconnects being a “drop in” solution that not only allows the cost effective packaging of today’s µscale ICs but also tomorrows nano-scale devices.

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