Question

What is the difference between an intrinsic and extrinsic semi conductor material? What is doping?

Answer 1

Answer on Question #47220, Physics, Atomic Physics

Task:

What is the difference between an intrinsic and extrinsic semiconductor material? What is doping?

Answer:

Intrinsic semiconductor is an un-doped semiconductor, in which there is no impurities added where as extrinsic semiconductor is a doped semiconductor, which has impurities in it.

Doping is a process, involving adding dopant atoms to the intrinsic semiconductor, there by gives different electrical characteristics.

Intrinsic semiconductors:

- Intrinsic semiconductors are the crystals of pure elements like germanium and silicon.

- 2. In intrinsic semiconductor, the number density of electrons is equal to the number density of holes. i.e., $n_e = n_h$.

- The electrical conductivity of intrinsic semiconductors is low.

- The electrical conductivity of intrinsic semiconductors mainly depends on their temperatures.

Extrinsic semiconductors:

- When some impurity is added in the intrinsic semiconductor, we get an extrinsic semiconductors.

- In extrinsic semiconductor, the number density of electrons is not equal to the number density of holes. i.e., $n_e$ is not equal to $n_h$.

- 3. The electrical conductivity of extrinsic semiconductors is high.

- 4. The electrical conductivity of extrinsic semiconductors depends on the temperature as well as the amount of impurity added in them.

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