Etching
In the etching step, a liquid (“wet etching”) or plasma (“dry etching”) chemical agent removes the uppermost layer of the substrate in the areas that are not protected by photo resis
Diffusion
The basic principle underlying this process is that the dopant atoms migrate from a region of high concenfration to the region of low concentration In simple, diffiision is the process of introducing controlled amounts of dopants into the semiconductors.
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