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AC LEC 16-10 - Temperature Effect on...

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Useful References for Energy Band Theory http://www.allaboutcircuits.com/vol_3/chpt_2/4 .html http://www.owlnet.rice.edu/~hennessy/chem121 /lectures/29oct04.pdf
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Lecture 16 - Extrinsic Semiconductors and Devices Extrinsic Semiconductors pn junctions Rectifier Diodes Zener Diodes pnp or npn junctions Bipolar transistors amplifiers switches
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Electronic Properties of Si and Ge
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Extrinsic Semiconductors Substitutional Solid Solutions Dopants are at low levels (100 to 1000 ppm) n-type dopants: Group VA elements in Group IVA Group VA: N, P, As, Sb ( donors ) Group IVA: C, Si, Ge, Sn p-type dopants: Group IIIA elements in Group IVA Group IIIA: B, Al, Ga, In ( acceptors ) Group IVA: C, Si, Ge, Sn
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P in Si (n- type) E
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Energy Bands in n-type
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B in Si (p-type) E
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Energy Bands in p-type
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Ionization Energies of Impurities donors n-type acceptors p-type
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Carrier Concentrations n-type n ≈ N (donor conc.) p-type
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Carrier Mobility and Concentration
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Electron movement in n- and p-type
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Unformatted text preview: Temperature Effect on Conductivity (n-type) (p-type) (n-type) Saturation Range (p-type) What will the carrier density equal for an extrinsic semiconductor with either donor exhaustion or acceptor saturation? Semiconductor Devices pn Junctions Depletion of Majority Carriers What will happen at the pn junction? a) current will flow b) no current will flow + _ Biasing the pn Junction Rectifier Diode Conversion of AC to DC Zener (avalanche) Diode Bipolar Junction Transistor Charge Carrier Motion Planar Bipolar npn Transistor MOSFET Al Al Poly Poly SiO 2 S D gate gate S D NMOS CMOS Summary - Lecture 16 Adding dopant atoms from column III or V to semiconductors increases the conductivity by increasing the carrier density n-type - majority carriers are negative electrons p-type - majority carriers are positive holes pn junctions are the basic feature of devices...
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