There are 3 types of materials used for electronics.. these include: Electrical Conductors, Electrical Insulator and Semi-Conductor.
Electrical Conductors - allows electricity to flow through them easily; low resistivity values.
Electrical Insulator - prevents electrical flow; have very high resistivity values.
Semi-Conductor - exhibit both conducting and insulating properties.
Most common type of Semi-Conductor is Silicon - there is small amounts of other elements such as Boron and Phosphorous added to it - this causes it to be a Semi-Conductor.
The simplest kind is a Diode.In a diode the electrical current can be made to flow in one direction only If the diode is reversed the flow of current is stopped. This behaviour is due to the semi-conducting property of the doped silicon.
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