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CAMP Seminar: Phonon-mediated quantum processes in semiconductors

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Emmanouil Kioupakis, University of Michigan
18 March 2014 from 3:30 PM to 4:30 PM
339 Davey Laboratory
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Lattice vibrations enable quantum electronic processes in
semiconductors that would otherwise be forbidden by energy and
momentum conservation. In this talk, I will present results from my
research on the predictive modeling of phonon-assisted electronic
processes in technologically important semiconductors. In particular,
I will discuss how lattice vibrations facilitate non-radiative Auger
recombination in nitride materials, which reduces the efficiency of
commercial LED light bulbs at high power. I will also discuss how
phonons enable the parasitic internal reabsorption of light by free
carriers in lasers and transparent conducting oxides. Last, I will
present our results for the phonon-assisted absorption of visible
light in silicon, which allows the operation of commercial silicon solar cells. These results highlight the impact of predictive modeling
of quantum phenomena for the design of efficient optoelectronic