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Understanding the mechanisms of degradation and failure observed in ESD protection devices under system-level tests
Publikationstyp
Journal Article
Date Issued
2010-06-01
Sprache
English
Author(s)
Pan, Zhihao
Holland, Steffen
Volume
10
Issue
2
Start Page
187
End Page
191
Article Number
5372000
Citation
IEEE Transactions on Device and Materials Reliability 10 (2): 187-191, art. no. 5372000 (2010)
Publisher DOI
Scopus ID
The behavior and the failure mechanism of a monolithic bidirectional ESD protection device under a system-level ESD pulse are investigated. The device is realized by two diffused vertical back-to-back connected diodes. When the bottom p-n junction is stressed with an 18-kV system-level pulse, the device exhibited the typical signature of second thermal breakdown. Surprisingly, no ESD damage could initially be observed by measuring the poststress leakage current, even when the ESD level was further increased to 30 kV. A degrading $IV$ behavior was later found to be associated with the second thermal breakdown. Based on simulations, local crystal defects are proposed to explain the observed degradation of the $IV$ behavior. It is shown that, in this case, leakage-current measurements alone fail to detect such ESD damage. Failure analysis of the device confirms the existence of the crystal damage.
Subjects
Degradation
Electrostatic discharges (ESDs)
DDC Class
621.3: Electrical Engineering, Electronic Engineering