Optoelectronic excitations and photovoltaic effect in strongly correlated materials

@article{Coulter2014OptoelectronicEA,
  title={Optoelectronic excitations and photovoltaic effect in strongly correlated materials},
  author={J. Eric Coulter and Efstratios Manousakis and {\'A}d{\'a}m Gali},
  journal={Physical Review B},
  year={2014},
  volume={90},
  pages={165142}
}
Solar cells based on conventional semiconductors have low efficiency in converting solar energy into electricity because the excess energy beyond the gap of an incident solar photon is converted into heat by phonons. Here we show by ab initio methods that the presence of strong Coulomb interactions in strongly correlated insulators (SCI) causes the highly photo-excited electron-hole pair to decay fast into multiple electron-hole pairs via impact ionization (II). We show that the II rate in the… 

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