| 摘要 |
A method for fabricating a packaging substrate includes: stacking two metal layers; encapsulating the two metal layers with assistant dielectric layers; forming built-up structures on the assistant dielectric layers, respectively; and separating the built-up structures along the interface between the two metal layers so as to form two packaging substrates. Owing to the adhesive characteristic of the assistant dielectric layers, the two metal layers are unlikely to separate from each other during formation of the built-up structures. But after portions of the dielectric layer around the periphery of the metal layers are cut and removed, the two metal layers can be readily separated from each other. The two metal layers can be patterned to form wiring layers, metal bumps, or supporting structures to avoid waste of materials. A packaging substrate and a fabrication method thereof are provided.
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