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Two Types of Semiconductors
Electronic Circuit: devices and analysis (ECDA 223)
STI West Negros University
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Two Types of Semiconductors Intrinsic Semiconductor a pure semiconductor every atom in the crystal is a silicon atom at room temperature, a silicon crystal actsapproximately like an insulator because it has onlyfew electrons and holes produced by thermalenergy
Extrinsic Semiconductor a doped semiconductor result of adding impurity atom to an intrinsiccrystal to alter / increase its electrical conductivity
Two Types of Impurities: Trivalent Impurities atoms that have 3 valence electrons this results to 1 electron deficiency (
excess of holes) often called acceptor atoms such as Boron (B) Indium (In) Gallium (Ga)
Types of Extrinsic Semiconductor P-Type Semiconductor net charge is positive produced when Trivalent atoms are added to themolten silicon producing excess of holes Majority carriers are holes (more holes thanelectrons)
Majority Carriers charge particles which are
greater in number within the semiconductive material Minority Carriers charge particles which are
lesser in number within the semiconductive material
N-Type Semiconductor net charge is negative produced when Pentavalent atoms are added tothe molten silicon producing excess of electrons Majority carriers are electrons (more electronsthan holes)
The conductivity of a semiconductor material can becontrolled by the amount of impurity added; that is Lightly doped semiconductor has high resistance Less conductivity Heavily doped semiconductor has low resistance High conductivity
Reasons why Si and Ge are the mostly usedsemiconductors: Can be manufactured to a very high purity level Has the ability to change electrical characteristics(conductivity) from poor conductor to a goodconductor
Two Types of Semiconductors
Course: Electronic Circuit: devices and analysis (ECDA 223)
University: STI West Negros University
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