Evaluation of directly bonded silicon wafer interface by the magic mirror method

  • Okabayashi O
  • Shirotori H
  • Sakurazawa H
 et al. 
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The magic mirror method was used to evaluate directly bonded Si wafers. An unbonded region at the silicon-to-silicon interface was detected as a bubble in an optical image by this method. The bubbles at the interface generate a locally convex distortion at the surface and this convex surface is visualized as a dark region using the magic mirror method. A comparison of the resulting effect was made with transmission X-ray topography and ultrasonic flaw detection, and good correspondence was found among the three methods, especially between the magic mirror method and transmission X-ray topography. We applied this method to the observation of changes of interface bubbles before and after thermal annealing. © 1990.

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  • Osamu Okabayashi

  • Haruo Shirotori

  • Hiroyuki Sakurazawa

  • Eizaburo Kanda

  • Takeshi Yokoyama

  • Mitsuo Kawashima

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