Semiconductors are widely used in electronics to make components such as diodes, transistors, thrusts, integrated circuits as well as semiconductor lasers. A ‘semiconductor’ is a material whose properties lie between conductors and insulators.
The resistance in semiconductor decreases as there is an increase in temperature because as the temperature is increased, the electrons present in the valence band get excited and jumps into the conduction band, which increases the conductance and hence, resistance decreases.
A semiconductor is usually a solid chemical element or compound that can conduct electricity under some conditions, making it a good medium for the control of electrical current. Its conductance varies depending on the current or voltage applied to a control electrode. Semiconductor is use for manufacturing chips.
A semiconductor device can perform the function of a vacuum tube having hundreds of times its volume. A single integrated circuit (IC), such as a microprocessor chip, can do the work of a set of vacuum tubes that would fill a large building and require its own electric generating plant.
