NDLI: Acceleration parameters and reliability of SiGe HBTs during long-term forward-biased operation

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Acceleration parameters and reliability of SiGe HBTs during long-term forward-biased operation

Content Provider	IEEE Xplore Digital Library
Author	Rosenthal, P.A. Paine, B.M. Kubota, N.T. Sunderland, D.A.
Copyright Year	2004
Description	Author affiliation: Boeing Satellite Syst. Inc., El Segundo, CA, USA (Rosenthal, P.A.; Paine, B.M.; Kubota, N.T.; Sunderland, D.A.)
Abstract	We have conducted accelerated lifetesting on discrete HBTs fabricated with the IBM SiGe5HP HBT technology, and determined the dependence of the wear-out on emitter interconnect temperature and current density. The wearout occurred by degradation of DC current gain, /spl beta/, caused by increase of the base current. The characteristics and the parametric dependences of the /spl beta/ degradation were consistent with an electromigration (EM) mechanism originally developed by IBM. EM in the emitter interconnects causes compressive stress on the emitter semiconductor sufficient to alter the semiconductor energy band structure, leading to an increase in base current and associated reduction in /spl beta/. Utilizing our empirically determined acceleration parameters, we have estimated the worst-case expected changes in /spl beta/ during typical use conditions (125 /spl deg/C, J/sub i/=1.0 mA//spl mu/m/sup 2/). The results showed that after 20 years /spl beta/ would degrade by approximately 17/spl plusmn/1%. This degradation is insignificant for most IC applications, and we therefore conclude that this technology is highly reliable during long-term forward-active bias operation.
Sponsorship	JEDEC JC-14.7 Comm. on Gallium Arsenide Reliability and Quality Stand
Starting Page	45
Ending Page	57
File Size	516108
Page Count	13
File Format	PDF
ISBN	0790801051
DOI	10.1109/ROCS.2004.184344
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	JEDEC
Subject Keyword	Acceleration Silicon germanium Germanium silicon alloys Degradation Heterojunction bipolar transistors Temperature dependence Current density Electromigration Compressive stress Lead compounds
Content Type	Text
Resource Type	Article

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