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The main reason semiconductor materials are so useful is that the behavior of a semiconductor can be easily manipulated by the addition of impurities, known as doping. Semiconductor conductivity can be controlled by introduction of an electric or magnetic field, by exposure to light or heat, or by mechanical deformation of a doped mono-crystalline grid; thus, semiconductors can make excellent sensors. Current conduction in a semiconductor occurs via mobile or "free"electrons and holes. collectively known as charge carriers. Doping a semiconductor such as silicon with a small amount of impurity atoms, such as phosphorus or boron. greatly increases the number of free electrons or holes within the semiconductor.

It can be make in very small size and the electronics device are small in size that why the semiconductors are used in electronic devices.

The above explains HOW semi conductors work.

The reason for WHY they are used is, what's the alternative?

The only alternative is thermionic valves (tubes).

Tubes fell out of favour for many reasons.

They run hot

Made of glass and delicate,

Heavy

Large

Consume lots of power

Need high voltages.

Semi conductors are the opposite of all of these.

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12y ago
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11y ago

"As the temperature increases, more covalent bonds are broken, and more free electrons and positive empty states are created... The concentrations (#/cm3) of electrons and holes are important parameters in the characteristics of a semiconductor material, because they directly influence the magnitude of the current. An intrinsic semiconductor is a single-crystal semicon- ductor material with no other types of atoms within the crystal. In an intrinsic semiconductor, the densities of electrons and holes are equal, since the thermally generated electrons and holes are the only source of such particles."

i THINK it's because at room temp there are less free electrons where as when it's extrinsic semiconductors there are more (compared to intrinsic) again: my opinion. I'm looking for the answer as well

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Q: Why intrinsic semiconductors are not used in practice for manufacturing of electronics devices?
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