Question

In n type semiconductor, electrons are majority charge carriers but it does not show any negative charge. The reason is

• A. Electrons are stationary
• B. Electrons neutralize with holes
• C. Mobility of electrons is extremely small
• D. Atom is electrically neutral

Answer 1

The correct option is D Atom is electrically neutral

Semiconductors have both free charge (electrons and holes) and immobile charge. When a donor is ionized, it creates a free electron, but also it creates a positively ionized donor atom. The charge on the free electron and the ionized donor are equal and opposite. So as long as the electron doesn't go anywhere, the net charge remains zero.