Lec10 G-R _ continuity

Lec10 G-R _ continuity - EECS 320 Generation-Recombination,...

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EECS 320 Generation-Recombination, Continuity Equations
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Summer Research Opportunities Summer research program through College of Engineering (look for email announcement) UROP http://www.lsa.umich.edu/urop/summer/fellowship (research at U-M) WIMS http://www.wimserc.org/education/education_undergraduate.php NSF NNIN REU http://reu.nnin.org, apps. due Wed. 2/11!!!!! (nanotechnology, projects at universities around the country) NSF-STC internships www.nsfstc.org (science and technology, universities around the country) NASA USRP http://education.nasa.gov/usrp (summer research at NASA sites)
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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
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Silicon is an indirect bandgap semiconductor What is the value of k associated with a photon? Would you expect radiative recombination (light
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This note was uploaded on 01/31/2011 for the course EECS 320 taught by Professor Philips during the Spring '06 term at University of Michigan.

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Lec10 G-R _ continuity - EECS 320 Generation-Recombination,...

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