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Contact Resistance of Thin Film Metal Contacts
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
2006 (English)In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 29, no 2, 371-378 p.Article in journal (Refereed) Published
Abstract [en]

To be able to reduce the size of products having electronic devices, it becomes more and more important to miniaturize the electromechanical parts of the system. The use of micromechanical connectors and contact structures implies the need of methods for estimating the properties of such devices. This work will, by use of finite element modeling, treat the influence of a thin film constituting at least one of the contacting members of an electrical contact. The error introduced by using the traditional Maxwell/Holm contact constriction resistance theory will be investigated. Numerical methods are used to present a way to approximate the total resistance for the thin metal film contact.

Place, publisher, year, edition, pages
2006. Vol. 29, no 2, 371-378 p.
Keyword [sv]
constriction resistance, contact resistance, Holm resistance, Maxwell resistance, microelectromechanical system (MEMS) relay, metal film, microconnector, microrelay, Sharvin resistance
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5466DOI: 10.1109/TCAPT.2006.875891ISI: 000237982600020Scopus ID: 2-s2.0-33744831222OAI: oai:DiVA.org:kth-5466DiVA: diva2:9839
Note
QC 20110114Available from: 2006-03-14 Created: 2006-03-14 Last updated: 2017-11-21Bibliographically approved
In thesis
1. Manufacture and characterization of elastic interconnection microstructures in silicone elastomer
Open this publication in new window or tab >>Manufacture and characterization of elastic interconnection microstructures in silicone elastomer
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The subject of this thesis is a new chip to substrate interconnection technique using self-aligning elastic chip sockets. This work was focused on the technology steps which are necessary to fulfill in order to realize the suggested technique. Elastic chip sockets offer a solution for several assembly and packaging challenges, such a thermo-mechanical mismatch, effortless rework, environmental compatibility, high interconnection density, high frequency signal integrity, etc.

Two of the most challenging technology aspects, metallization and etching of the silicone elastomer were studied, but also, air bubble free casting of the silicone elastomer was taken into consideration. Elastic chip sockets and single elastic micro-bump contacts of different shapes and sizes were manufactured and characterized.

The contact resistance measurements revealed that the elastic micro-bump contacts manufactured by using the developed methods require less than one tenth of the contact force to achieve the same low contact resistance as compared to commercial elastic interconnection structures.

The analysis and measurements of the high frequency properties of the elastic micro-bump structures have shown that they can operate up to several tens of GHz without a serious degradation of the signal quality.

The same methods were applied to manufacture very high density contact area array (approximately 80000 connections/cm2), which until now was achieved only using so called chip-first techniques.

The low contact resistance, the absence of environmentally harmful materials, no need of soldering, easy rework as well as capability of very high interconnecting density and very high frequency compatibility, indicates a high potential of this technique for assembly and packaging.

Moreover, the presented technology of the silicone elastomer micromachining (metallization and RIE in particular) can be used for manufacturing of other microstructures, like chemical or biological micro reactors.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xiv, 47 p.
Series
Trita-EKT, ISSN 1650-8599 ; 2006:1
Keyword
silicone elastomer, packaging, assembly, elastic interconnection, chip socket, metallization, RIE of silicone elastomer
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-3877 (URN)
Public defence
2006-03-23, Sal Q221, Mittuniversitet, Östersund, 13:00
Opponent
Supervisors
Note
QC 20110114Available from: 2006-03-14 Created: 2006-03-14 Last updated: 2011-01-14Bibliographically approved

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