Question

Explain the Process called diffusion in P-type and n-type materials

Answer 1

Answer:

p-type and n-type materials are simply semiconductors, such as silicon (Si) or germanium (Ge), with atomic impurities; the type of impurity present determines the type of the semiconduction

Answer 2

Answer:

Diffusion and drift

concept

Diffusion is the process of movement of charge carriers due to concentration gradient along the semiconductor. In a p-n junction, n-side has excess of electrons and hence electrons diffuse from n-side to p-side. Similarly, holes diffuse from p-side to n-side.

Drift is the process of movement of charge carriers due to the net electric field. In a pn-junction with no external source, electric field is from n-side to p-side and hence electrons drift from p-side to n-side.

Explanation:

Formation of p-n junction

1. p-n junction is formed using the p-type and n-type semiconductor of same material.

2. When the two semiconductors are brought in contact, electrons diffuse from n-side to p-side and holes diffuse from p-side to n-side near the junction.

3. As this happens, the region near the boundary becomes depleted of majority charge carriers and atoms near the junction become ionized. This region is called the space-charge region or depletion region.

4. Ionized donor atoms are positively charged and ionized acceptor atoms are negatively charged.

5. This causes drift of electrons in a direction opposite to the direction of diffusion until the charge flow stops.

Note:

Ionized atoms are immobile because of the crystalline structure unlike charge carriers.

Mark as brainliest