lect17 - SEMICONDUCTOR LIGHT SOURCES Basic parameters of...

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SEMICONDUCTOR LIGHT SOURCES Basic parameters of semiconductor light sources Light emitting diodes Semiconductor injection lasers Material considerations and fabrication
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BAND STRUCTURE Electronic band structure - ranges of energy that an electron is "forbidden" or "allowed" to have Band structure electronic and optical properties Wave functions of the first five atomic orbitals, Wikipedia Single free-standing atom: Atomic orbitals – Descrete energy levels Wikipedia Two atoms: Coupled system with 2 ‘new’ levels
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ENERGY BANDS C atoms 1s 2 2s 2 2p 2 1s 2 – filled (core electrons) 2s 2 – filled 2p 2 – partially filled (valence electrons)
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ENERGY BANDS C atoms 1s 2 2s 2 2p 2 2s – 2 states 2p – 6 states For N atoms: 2s line – 2N-fold degenerate 2p line – 6N-fold degenerate
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ENERGY BAND IN CRYSTALS Electron energy E vs wave vector k for a monatomic linear lattice, lattice constant a E k Free electron
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ENERGY BAND DIAGRAMS Insulator Energy Metal Semiconductors
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lect17 - SEMICONDUCTOR LIGHT SOURCES Basic parameters of...

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