Question re. electroplated gold. Thank you!

  1. Hello, I have a question for electrodeposition of gold.

    So I tried to electroplate gold on a Si wafer with gold seed layer on it. I used SU-8 as my photoresist to form a pattern. But my electroplated gold was black and granular.

    Area is 19mm^2 and desired thickness is 50 um. I set the effective current to be 1.9 mA.

    Any ideas?

    Thank you so much!!!!!
     
  2. jcsd
  3. 1. Try to reduce current, 100A/m^2 may be too much for electroplating.
    2. What kind of electrolite do you use? Normally, it should slightly dissolve gold to remove defects of growing layer.
     
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