Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 133, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3474576
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Funding
- Office of Basic Energy Sciences, U.S. Department of Energy
- Los Alamos LDRD funds
- CNLS
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The effect of carrier multiplication (CM) in semiconductor nanocrystals is systematically treated by employing an exciton scattering approach. Using projection operators, we reduce the Coulomb coupled multiexciton dynamics to scattering dynamics in the space spanning both single-and biexciton states. We derive a closed set of equations determining the scattering matrix elements. This allows us to interpret CM dynamics as a series of odd-order interband scattering events. Using the time-dependent density matrix formalism, we provide a rigorous description of the CM dynamics induced by a finite-time pump pulse. Within this approach, both processes of single-and biexciton photogeneration and the consequent population relaxation are treated on the same footing. This approach provides a framework for numerical calculations and for comparisons of the quantum efficiencies associated with each process. For applications, the limit of weak interband Coulomb coupling is considered. Finally, we demonstrate that three previously used theoretical models can be recovered as limiting cases of our exciton scattering model. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3474576]
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