What type of semiconductor is formed when pure silicon is doped with a trivalent impurity like boron or aluminium?

💡 Solution & Explanation

Doping an intrinsic semiconductor like pure silicon with trivalent impurities such as boron, aluminium, or gallium creates electron vacancies known as holes, resulting in a p-type semiconductor where holes act as majority charge carriers. Conversely, pentavalent dopants like phosphorus or arsenic donate excess electrons to form n-type semiconductors. Semiconductor physics forms the foundation of modern electronic devices and is a regular topic in science examinations.