SEMICONDUCTORS

SEMICONDUCTORS : THEY ARE MATERIALS WHICH HAVE CONDUCTIVITY LYING BETWEEN THOSE OF AN INSULATOR AND A CONDUCTOR.

INTRINSIC (PURE) SEMICONDUCTORS -UNDOPED SEMICONDUCTOR,i-TYPE SEMICONDUCTOR.

EXTRINSIC (IMPURE) SEMICONDUCTORS- A SEMICONDUCTOR WHICH IS DOPED.

DOPING : THE EFFICIENCY OF SEMICONDUCTORS ARE IMPROVING IN TECHNOLOGY BY INTRODUCING A SMALL NO: OF SUITABLE REPLACEMENT ATOMS INTO THE SEMICONDUCTOR LATTICE. IT IS A PROCESS OF CONVERTING AN INTRINSIC SEMICONDUCTOR INTO AN EXTRINSIC SEMICONDUCTOR.THIS PROCESS IS KNOWN AS DOPING.

TYPES OF SEMICONDUCTORS

n-type SEMICONDUCTORS : NO: OF NEGATIVE CHARGE CARRIER IS LARGER THAN THE POSITIVE CHARGE CARRIER.
p-type SEMICONDUCTORS : NO OF POSITIVE CHARGE IS GREATER THAN NEGATIVE CHARGE CARRIER.
p-n junction type