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The addition of a trivalent atom (e.g. Boron) to silicon leads to an empty.Electron state or hole which, positive, can be ionized from the effective single.Negative charge e on the B atom. The ionization energy is again about, 0.01 eVAs might be expected. Therefore the doping of silicon with boron leads to the introduction of acceptor states about 0.01 eV. Above the top of the, valence bandAs shown in Fig. 2.11 and to, p-type semiconductivity. In the case of N - or p-type.Semiconductivity the temperature dependence of the conductivity is similar to.That in Eq. (2.37) with Eg replaced by Ei.