P-channel, or P-type semiconductor (P is the first letter of Positive): In a silicon crystal (or germanium crystal) doped with a small amount of impurity boron (or indium), since a semiconductor atom (such as a silicon atom) is substituted by an impurity atom, a boron atom When the three outer electrons of the outer layer form a covalent bond with the surrounding semiconductor atoms, a "hole" is created which may attract the bound electrons to "fill" the boron atoms into negatively charged ions. Thus, such semiconductors become electrically conductive substances due to their high concentration of "holes" ("equivalent to" positive charges).
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