Phys. Rev. Lett. 96, 097402 (2006) [4 pages]Non-Poissonian Exciton Populations in Semiconductor Nanocrystals via Carrier MultiplicationReceived 19 October 2005; published 7 March 2006 We analyze distributions of exciton populations in PbSe nanocrystal (NC) ensembles as a function of excitation wavelength. For photon energies that result in carrier multiplication, these distributions are non-Poissonian and are characterized by two dominant exciton multiplicities that are determined by the ratio of photon energy to NC energy gap. For certain photon energies, we produce photoexcited NC ensembles with a nearly pure single multiplicity that can be tuned from 1 to 7. This result can find applications ranging from lasing and nonlinear optics to photovoltaics and photocatalysis. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.097402
DOI:
10.1103/PhysRevLett.96.097402
PACS:
78.67.Bf, 71.35.−y, 73.21.La, 78.47.+p
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.