Semiconductor js
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Transcript of Semiconductor js
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Welcome To Our
Presentation
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Submitted ByoMD. Mominuz Zaman
ID#141-15-3103oSharmin Sultana Jeesa
ID#141-15-3219
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Semiconductor
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Semiconductor
oA Semiconductor is a substance which has resistivity 10-4 to 0.5 Ω-m and the resistivity of Semiconductor lies between conductors and insulators.
oThe example of Semiconductor are silicon(si), germanium(Ge) etc.
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Properties of Semiconductors
o The resistivity of Semiconductor lies between insulator and conductor.
o Semiconductor has negative temperature coefficient.
o If metallic impurity is added to the Semiconductor its current carrying properties changes significantly.
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Bonds in Semiconductors
oThe bonds in semiconductor are formed by covalent bond.
oElectron configuration of Silicon is Si(14)-1s22s22p63s23p2.
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Types of Semiconductor
Semiconductor are basically 2 types:oIntrinsic SemiconductoroExtrinsic Semiconductor
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Intrinsic SemiconductoroA semiconductor is an extremely pure form is known as intrinsic semiconductor.
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Extrinsic Semiconductor
oWhen impurity is added with pure semiconductor to increase the current carrying properties then it is called extrinsic semiconductor .
oThis added impurity is very small in amount. Basically, 1 atom is added for 10⁸atoms of pure semiconductor to make extrinsic semiconductor.
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Types of Extrinsic Semiconductor
Depending upon the type of impurity added, extrinsic semiconductor are classified as-on-type Semiconductorop-type Semiconductor
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n-type SemiconductoroWhen a small amount of penta-valent material is added to the semiconductor then it is known as n-type semiconductor.
oElectron Configuration of Arsenic is , As(33)-1s22s22p63s2
3p63d10
4s24p3
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p-type SemiconductoroWhen a small amount of trivalent material is added to the semiconductor then it is called p-type semiconductor.oThe Electron Configuration of Gallium is Ga(31)-1s22s22p63s23p63d104s24p1
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Majority & Minority Carriers
oFor n-type material the free electrons are considered as majority carriers & the holes are minority carriers.
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Majority & Minority Carriers
• For p-type material the holes are considered as majority carriers & the free electrons are minority carriers.
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Thank You