Multiexciton Generation by a Single Photon in Nanocrystals

A. Shabaev, A. L. Efros, Arthur Nozik

Research output: Contribution to journalArticlepeer-review


We have theoretically shown that efficient generation of multi-electron-hole pairs by a single photon observed recently in semiconductor nanocrystals is caused by breaking the single electron approximation for carriers with kinetic energy above the effective energy gap. Due to strong Coulomb interaction, these states form a coherent superposition with charged excitons of the same energy. This concept allows us to define the conditions for dominant two-exciton generations by a single photon: the thermalization rate of a single exciton, initiated by light, should be lower than both the two-exciton state thermalization rate and the rate of Coulomb coupling between single and two exciton states. Possible experimental manifestations of our model are discussed.
Original languageAmerican English
Pages (from-to)2856-2863
Number of pages8
JournalNano Letters
Issue number12
StatePublished - 2006

NREL Publication Number

  • NREL/JA-270-41474


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