08_Generation+_+recombination

08_Generation+_+recombination - Recombination and...

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EECS-320, L.J. Guo 1 Recombination and Generation What are the roles of recombination and generation processes in semiconductors? What are the mechanisms of R-G? What is the significance of direct and indirect bandgap in R-G processes? How to quantify the thermal R-G ? What is minority carrier lifetime? What determines the lifetime? How to measure the lifetime?
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EECS-320, L.J. Guo 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 Recombination-Generation is nature’s restoring mechanism when a semiconductor is perturbed from the equilibrium state.
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EECS-320, L.J. Guo Generation and Recombination E C E V e - h + * Photogeneration E C E V e - h + * Band-to-Band Recomb. E C E V e - h + * * E T * G-R through Centers (Traps) Other processes : Auger recombination Impact Ionization = i i ττ 1 1 Typically, one mechanism occurs at a much faster rate and is dominant
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EECS-320, L.J. Guo
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This note was uploaded on 07/22/2011 for the course EECS 320 taught by Professor Sun during the Fall '10 term at University of Florida.

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08_Generation+_+recombination - Recombination and...

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