A Fluxless and Low-Temperature Flip Chip Process Based on Insertion Technique

Manuel Fendler 1, * Cécile Davoine François Marion 1 Damien Saint Patrice 1 Roland Fortunier 2, 3 Herve Ribot 1
* Auteur correspondant
1 CEA-LETI - Laboratoire d'Electronique et des Technologies de l'Information
2 MPM-ENSMSE - Département Microstructures et Propriétés Mécaniques
3 PECM-ENSMSE - Plasticité, Endommagement et Corrosion des Matériaux
Abstract : Abstract: For heterogeneous materials assembly, the thermal expansion mismatch between the chip and the substrate is a roadblock for Hip chip bonding of ultrafine-pitch (<= 10 mu m) and large diagonal devices (>= 20 mm). Residual strains in bumps and device warpage have been calculated to evaluate the thermomechanical limits of a conventional flip chip soldering process using micro bumping. As a solution to overcome these limits, this paper describes a new patented flip-chip technology representing a technological breakthrough compared to conventional methods such as soldering or bonding through conductive adhesives. Electrical connections are performed by the insertion of metallic micro-tips in a ductile material. As a low-temperature process and fluxless technology, this method is adapted to fine-pitch and large devices. As a proof of concept, we present the bonding results obtained on fine-pitch large arrays of daisy chains with 500 x 500 contacts and 30-mu m pitch. The electrical contact has been demonstrated and characterized in terms of resistance and yield.
Keywords : Fine pitch flip chip fluxless insertion interconnection large infrared detector array thermomechanical modeling INTERDIFFUSION
Type de document :
Article dans une revue
Components and Package Technologies, 2009, 32 (1), pp.207-215. 〈10.1109/TCAPT.2008.2005099〉
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https://hal-emse.ccsd.cnrs.fr/emse-00498450
Contributeur : Anna Fraczkiewicz <>
Soumis le : mercredi 7 juillet 2010 - 14:55:22
Dernière modification le : mercredi 14 février 2018 - 14:05:36

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Manuel Fendler, Cécile Davoine, François Marion, Damien Saint Patrice, Roland Fortunier, et al.. A Fluxless and Low-Temperature Flip Chip Process Based on Insertion Technique. Components and Package Technologies, 2009, 32 (1), pp.207-215. 〈10.1109/TCAPT.2008.2005099〉. 〈emse-00498450〉

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