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Silicon
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Silicon
Occurs as silica (SiO2) & other silicates.Hard & Brittle.
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Forms Of Silica
Agate Opal
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Pure Silicon
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Pure Silicon
Intrinsic Silicon.Covalent Bond.Insulator.Resistivity 2.5 x 105 ohms-cm
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Pure Silicon
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Pure Silicon Bonding
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Why Silicon
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Why Silicon
Abundance of SiliconHigher Melting Temperature for Wider
Processing Range.Wider Temperature range of operationNatural growth of SiO2
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Why Silicon
• SiO2 growth is needed for high performance MOS.
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Doped Silicon
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Doping
Adding Certain Elements to Enhance the Conductivity of Semiconductor.
Becomes Extrinsic.Resistivity drops to 0.2 ohms-cm.
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Doping of Silicon
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Dopant Material
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Dopant Material
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n-Type Silicon
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n-Type Silicon
Pentavalent Dopant Used.More Electrons than Valance Band Holes.Need Little Energy for Excess Electron to Go to
Conduction Band.Majority Carrier Electron & Minority Carrier
Hole.
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n-Type Silicon
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p-Type Silicon
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p-Type Silicon
Trivalent Dopant usedMore Valance Band Holes than Conduction
Band Electrons.Majority Carrier Hole & Minority Carrier
Electron.
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p-Type Silicon
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p & n Type Silicon