Influence of direct Au-bump formation on metal oxide semiconductor field effect transistor

Naoya Watanabe, Tanemasa Asano

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Change in the electrical characteristic of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) owing to direct Au bump formation on the MOSFET has been investigated. The investigation was carried out by correlating the spatial distribution of both dynamic strain and residual strain generated by Au bump formation with that of change in the electrical characteristic of the MOSFET. Strain was measured using chains of Si thin film gauges. The bump formation did not significantly affect threshold voltage Vth. However, some change was observed in the transconductance gm of the MOSFET. The observed change in gm was maximum at the center of the bump and its value was less than 3.5%. As the result of dynamic strain and residual strain measurements, it is found that residual strain causes the change in the transconductance gm of MOSFETs, although dynamic strain generated during application of the ultrasonic vibration to the Au bump is much higher than residual strain. It is also found that the direction of g m change (+ or -) is opposite for n-channel and p-channel and that the magnitude of gm change is dependent on the crystallographic orientation.

Original languageEnglish
Pages (from-to)2714-2719
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number4 B
DOIs
Publication statusPublished - Apr 1 2002

Fingerprint

MOSFET devices
metal oxide semiconductors
field effect transistors
transconductance
Transconductance
strain measurement
threshold voltage
spatial distribution
Strain measurement
ultrasonics
Threshold voltage
Spatial distribution
Vibrations (mechanical)
Gages
vibration
causes
Ultrasonics
thin films
Thin films

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Influence of direct Au-bump formation on metal oxide semiconductor field effect transistor. / Watanabe, Naoya; Asano, Tanemasa.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 4 B, 01.04.2002, p. 2714-2719.

Research output: Contribution to journalArticle

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