7.+Recombination+_2008_

7.+Recombination+_2008_ - MATSCI 302 April 16, 2008...

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Recombination • Radiative • Auger • Recombination through recombination centers • Surface recombination MATSCI 302 April 16, 2008
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Radiative recombination The rate of radiative recombination is np dt dn r α = Fermi’s Golden Rule can be used to calculate α r . For those of you who haven’t taken quantum mechanics, the important things to know are 1.) α r is proportional to the absorption cross section. We can’t, therefore, have materials that absorb well, but have negligible rates of radiative recombination. 2.) α r is small in indirect band gap semiconductors like silicon. Consequently, this type of recombination isn’t an issue in silicon cells. It is more important in GaAs cells.
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Auger recombination A charge carrier gives its energy to another charge carrier, which goes deeper into the band. This carriers then goes back to the band edge, giving off the energy to phonons.
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This note was uploaded on 12/01/2011 for the course MS&E 302 taught by Professor Mcghee during the Spring '08 term at Stanford.

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7.+Recombination+_2008_ - MATSCI 302 April 16, 2008...

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