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3/27/2015PHY 752 Spring 2015 -- Lecture 251 PHY 752 Solid State Physics 11-11:50 AM MWF Olin 107 Plan for Lecture 25: Chap. 18 & 19 in Marder Impurity states Properties of semiconductors Some of the lecture materials are from slides prepared by Marder
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3/27/2015PHY 752 Spring 2015 -- Lecture 252
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3/27/2015PHY 752 Spring 2015 -- Lecture 253 Impurity states due to point defects
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3/27/2015PHY 752 Spring 2015 -- Lecture 254 Impurity states due to point defects -- continued
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3/27/2015PHY 752 Spring 2015 -- Lecture 255 Impurity states due to point defects -- continued Dielectric constant valence charge of impurity relative to that of host lattice
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3/27/2015PHY 752 Spring 2015 -- Lecture 256 Impurity states due to point defects -- continued
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3/27/2015PHY 752 Spring 2015 -- Lecture 257 Semiconductor properties Population of electrons (n) and holes (p) in a pure semiconductor
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3/27/2015PHY 752 Spring 2015 -- Lecture 258 Semiconductor properties -- continued For:
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3/27/2015PHY 752 Spring 2015 -- Lecture 259 Semiconductor properties -- continued multiplicity of conduction band minima
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3/27/2015PHY 752 Spring 2015 -- Lecture 2510 Semiconductor properties -- continued For intrinsic semiconductor, n=p=n i
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3/27/2015PHY 752 Spring 2015 -- Lecture 2511 Semiconductor properties -- continued Effects of impurities: Intrinsic carriers:
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3/27/2015PHY 752 Spring 2015 -- Lecture 2512 Semiconductor properties – continued Typically, the ionized impurities dominate the carrier concentrations
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3/27/2015PHY 752 Spring 2015 -- Lecture 2513 Semiconductor properties – continued For primarily donor doping: For primarily acceptor doping:
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3/27/2015PHY 752 Spring 2015 -- Lecture 2514 Semiconductor junction Before equilibration After equilibration Junction potential
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3/27/2015PHY 752 Spring 2015 -- Lecture 2515 Semiconductor junction
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3/27/2015PHY 752 Spring 2015 -- Lecture 2516 Semiconductor junction
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3/27/2015PHY 752 Spring 2015 -- Lecture 2517 Simplified model: Semiconductor junction
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3/27/2015PHY 752 Spring 2015 -- Lecture 2518 Semiconductor junction
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3/27/2015PHY 752 Spring 2015 -- Lecture 2519 Behavior of ideal diode
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3/27/2015PHY 752 Spring 2015 -- Lecture 2520 Behavior of ideal diode – continued Diffusion of electrons and holes:
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