Solar power technologies pros and cons
Controversy over alternative energy (part 2)
Voltaic cells production
In the superior layer of a semiconductor doped N voltaic cell exists a larger quantity of free electrons compared to the intrinsic material (non-doped), hence the name superconductor doping N, for electron negative. The doping N production consisted of increasing the density of electrons in the semiconductor. The atoms or the elements needed generally have 5 valence electrons to participate in the chemical bond, and they are usually in the IV column of the periodic table chart: P, As, Sb, are commonly used in the production… Those atoms embedded in the crystal lattice will present 4 covalent bonds and a free electron. This electron who's weakly bound to the atom can easily be excited toward the conductive band. When the doping N is sufficient, the number of electrons surpass by far the number of holes, and they become majority carriers.