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Dr. Kyle Bushick and Professor Emmanouil Kioupakis present a consistent first-principles methodology to study both direct and phonon-assisted Auger-Meitner recombination (AMR) in indirect-gap semiconductors that we apply to investigate the microscopic origin of AMR processes in silicon. Their results are in excellent agreement with experimental measurements and show that phonon-assisted contributions dominate the recombination rate in both n-type and p-type silicon, demonstrating the critical role of phonons in enabling AMR. They also decompose the overall rates into contributions from specific phonons and electronic valleys to further elucidate the microscopic origins of AMR. Their results highlight potential pathways to modify the AMR rate in silicon via strain engineering.

United statesKyle bushickLise meitnerPatriciaj betzEmmanouil kioupakisLawrence berkeley national labOffice of advanced scientific computing researchUniversity of michiganInternational energy agencyNational energy research scientific computing centerOffice of scienceUs department of energyEnergy sciences under award noMethod of researchLawrence berkeley national laboratoryComputational materials sciences program