Formation process of hole-type semiconductor
Doping trivalent elements (such as boron) in pure silicon crystals to replace the position of silicon atoms in the crystal lattice forms a P-type semiconductor. In P-type semiconductors, holes are multi-children and free electrons are minority children, which mainly conduct electricity by holes. Since the amount of positive charge and the amount of negative charge in the P-type semiconductor are equal, the P-type semiconductor is electrically neutral. Holes are mainly provided by impurity atoms, and free electrons are formed by thermal excitation.