BASIC OF SEMICONDUCTORS

WHAT IS THE SEMICONDUCTORS?
The semiconductor is the material which has conductivity level somewhere in between the extremes of an insulator and a conductor.

HISTORY OF DISCOVERY
Semiconductor was opened by three American scientists John Barden, Walter Brattain and William Shockley. And all of them received the Nobel Prize in 1965.

DIFFERENT TYPES OF SEMICONDUCTORS
Intrinsic semiconductor
This is a pure form of semiconductor crystal.

Extrinsic semiconductor
When the properties of intrinsic semiconducting materials are altered by adding impurities to it, it becomes an extrinsic semiconducting material. Besides, extrinsic semiconductors classified into
N-type
P-type

N-type
N-type semiconductors are produced when a pentavalent impurity such as antimony or phosphorus is added to a pure semiconducting material like silicon or germanium.

P-type
P-type semiconductors are produced when a trivalent impurity such as aluminum or indium is added to a pure semiconducting material like silicon.