ECE474S09_Lecture15 - ECE 474: Principles of Electronic...

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Unformatted text preview: ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University ayresv@msu.edu Lecture 15: Chp. 02: Nanosystems Quantized energy levels: Atomic spectra Wavelike electrons: Davisson-Germer Particle-like photons: Photoelectric effect Wavelike electrons+Unceratinty Principle: What is the average position? What is the average momentum? What is the average kinetic energy? What is the average total energy? Potential energy the physical situation Potential Energy and width of a quantum well Potential Energy and width of a barrier The electron in the quantum well The electron in, yes in, the barrier Finite potential well examples Finite potential barrier examples Energy levels in the infinite potential well Pr. 2.12: Chp. 03 preview: the outermost bonding electrons Lecture 15: Chp. 02: Nanosystems Quantized energy levels: Atomic spectra Wavelike electrons: Davisson-Germer Particle-like photons: Photoelectric effect Wavelike electrons+Unceratinty Principle: What is the average position? What is the average momentum? What is the average kinetic energy? What is the average total energy? Potential energy the physical situation Potential Energy and width of a quantum well Potential Energy and width of a barrier The electron in the quantum well The electron in, yes in, the barrier Finite potential well examples Finite potential barrier examples Energy levels in the infinite potential well Pr. 2.12: Chp. 03 preview: the outermost bonding electrons The electron has: A wave description (x,y,z,t) A total energy E Total (eV) The physical situation has: Available energy levels plotted on the y-axis ..per distance plotted on the x-axis The physical situation is also called the Potential Energy: PE, U, V, etc Example 01: finite potential well: We define a PE physical situation as follows: 0 x< 3 nm, PE = 1 eV 3 x< 5 nm, PE = 4 eV 5 x< 8 nm, PE = 0 eV 8 x< 8.5 nm, PE = 5 eV 8.5 x< 10 nm, PE = 0 eV Plot the available energy levels Example 01: finite potential well: We define a PE physical situation as follows: 0 x< 3 nm, PE = 1 eV 3 x< 5 nm, PE = 4 eV 5 x< 8 nm, PE = 0 eV 8 x< 8.5 nm, PE = 5 eV 8.5 x< 10 nm, PE = 0 eV Example 01: finite potential well: We define a PE physical situation as follows:...
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ECE474S09_Lecture15 - ECE 474: Principles of Electronic...

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