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Effect of Process Variables on Glass Frit Wafer Bonding in MEMS Wafer Level Packaging

Published online by Cambridge University Press:  01 February 2011

Sid Sridharan ,
Jim Henry ,
John Maloney ,
Bob Gardner ,
Keith Mason ,
Viorel Dragoi ,
Jurgen Burggraf ,
Eric Pabo  and
Erkan Cakmak
Sid Sridharan
Affiliation:
sridharan@ferro.com, Ferro Corporation, Electronic Materials System, Independence, Ohio, United States
Jim Henry
Affiliation:
HenryJ@Ferro.com, Ferro Corporation, EMS, Vista, California, United States
John Maloney
Affiliation:
MaloneJ@Ferro.com, Ferro Corporation, Electronic Materials System, Independence, Ohio, United States
Bob Gardner
Affiliation:
GardnerB@Ferro.com, Ferro Corporation, EMS, Vista, California, United States
Keith Mason
Affiliation:
MasonK@ferro.com, Ferro Corporation, EMS, Vista, California, United States
Viorel Dragoi
Affiliation:
v.dragoi@evgroup.com, EV Group, Florian, Austria
Jurgen Burggraf
Affiliation:
j.burggraf@evgroup.com, EVGroup, Florian, Austria
Eric Pabo
Affiliation:
E.Pabo@EVGroup.com, EV Group, Tempe, Arizona, United States
Erkan Cakmak
Affiliation:
E.Cakmak@EVGroup.com, EV Group, Tempe, Arizona, United States
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Abstract

Among different MEMS wafer level bonding processes glass frit bonding provides reliable vacuum tight seals in volume production. The quality of the seal is a function of both seal glass materials and the processing parameters used in glass frit bonding. Therefore, in this study Taguchi L18 screening Design of Experiment (DOE) was used to study the effect of materials and process variables on the quality of the glass seal in 6” silicon wafers bonded in EVG520IS bonder. Six bonding process variables at three levels and two types of sealing glass pastes were considered. The seals were characterized by Scanning Acoustic Microscopy (SAM), cross sectional Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX). The results were quantified into four responses for DOE analysis. Key results are a) peak temperature has the strongest influence on seal properties, b) hot melt paste has significantly lower defects compared to liquid paste, and c) peak firing temperatures can be as low as 400°C under certain conditions.

Keywords

microelectro-mechanical (MEMS)screen printingmicroelectronics
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1139: Symposium GG – Microelectromechanical Systems–Materials and Devices II , 2008 , 1139-GG03-35
Copyright
Copyright © Materials Research Society 2009

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