Assertion: diode's layer | /r/HasProperty | doped with p-type impurities
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text: If the junction was constructed of two separate pieces this would introduce a discontinuity in the crystal lattice, so PN junctions are created in a single crystal of semiconductor by introducing certain impurities called dopants, for example by ion implantation, diffusion, or by epitaxy (growing a layer of crystal doped with n-type impurities on top of a layer of crystal doped with p-type impurities for example).