A p-type semiconductor has a large number of holes but still it is electrically neutral. Explain.

Explanation

A p-n semiconductor is formed by doping pure germanium or silicon crystal with suitable impurity atoms of valence three. As the impurity atims take the positions of germanium atoms in germanium crystal its three electrons from covalent bonds by sharing electrons with the neighborring three atoms of germanium whereas the fourth covalent bond is left incomplete for want of one electron. This creates a hole. Since the atom on the whole is electrical neutral, the p-type semiconductor is also neutral.