Glossary

p-type

Beginner

Silicon with extra holes, made by mixing in atoms that each have one electron too few.

Novice

Silicon doped with acceptors (usually boron). Holes are the majority carriers and the Fermi level sits closer to the valence band.

Expert

p≈Nap \approx N_{\mathrm{a}}, n=ni2/Nan = n_{\mathrm{i}}^2/N_{\mathrm{a}}, Ei−EF=kTln⁡(Na/ni)=qϕBE_{\mathrm{i}} - E_{\mathrm{F}} = kT \ln(N_{\mathrm{a}}/n_{\mathrm{i}}) = q\phi_{\mathrm{B}}. The body of an NMOS transistor is p-type; ϕB\phi_{\mathrm{B}} sets the 2ϕB2\phi_{\mathrm{B}} band bending needed for inversion.

Explained in Bands, doping and the p-n junction (Transistors).

See also: Doping, n-type.

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