Initial wafer check

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Proposed initial wafer checks[edit]

[In brackets the results that should go into the process log are given]

  • Microscope check of masks [record irregularities, dirt, etc.]
  • Microscope check of wafers [record pits, cracks, etc.]
  • AFM on SOI wafer [RMS roughness];
  • AFM on III/V wafer [RMS roughness];
  • Verify epitaxial layerstack by wet etch and Dektak [Epi layer thicknesses];
  • ...



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