07+G-R - EECS 320 Generation-Recombination Generation and...

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EECS 320 Generation-Recombination
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Generation and Recombination Generation: creation of conducting electrons and holes Recombination: elimination of conducting electrons and holes There are several physical processes where G-R may occur
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Band-to-Band R-G Photogeneration Band-to-Band Recomb. e - E C E V e - h + * E C E V * h + •Band to Band or “direct” (directly across the band) generation •Basis for optoelectronic devices such as light-emitting diodes, photodetectors, solar cells, etc…
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Conservation Of Energy/Momentum Energy and momentum needs to be conserved for generation and recombination events Indirect Bandgap (e.g. Si) Direct Bandgap (e.g. GaAs) a k π 2 85 . 0 = E G k=0 E k Conduction Band Valence Band E G k=0 E k k h p h h = = = λ 2
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Conservation Of Energy/Momentum Silicon is an indirect bandgap semiconductor What is the value of k associated with a photon?
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Optical Generation The momentum of a photon is small Indirect Bandgap (e.g. Si) Direct Bandgap (e.g. GaAs)
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07+G-R - EECS 320 Generation-Recombination Generation and...

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