Journal
NANO LETTERS
Volume 10, Issue 12, Pages 4839-4843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1024485
Keywords
Graphene; carrier multiplication; Auger recombination; impact ionization; relaxation dynamics
Categories
Funding
- Deutsche Forschungsgemeinschaft [SPP 1459]
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Graphene as a zero bandgap semiconductor is an ideal model structure to study the carrier relaxation channels which are inefficient in conventional semiconductors In particular it is of fundamental interest to address the question whether Auger-type processes significantly Influence the carrier dynamics in graphene These scattering channels bridge the valence and conduction band allowing carrier multiplication a process that generates multiple charge carriers from the absorption of a single photon This has been suggested in literature for improving the efficiency of solar cells Here we show based on microscopic calculations within the density matrix formalism that Auger processes do play an unusually strong role for the relaxation dynamics of photoexcited charge carriers in graphene We predict that a considerable carrier multiplication takes place confirming the potential of graphene as a new material for high efficiency photodevices
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