In:
Annual Review of Physical Chemistry, Annual Reviews, Vol. 58, No. 1 ( 2007-05-01), p. 635-673
Abstract:
Because of the strong spatial confinement of electronic wave functions and reduced dielectric screening, the effects of carrier-carrier Coulomb interactions are greatly enhanced in semiconductor nanocrystals (NCs) compared with those in bulk materials. These interactions open a highly efficient decay channel via Auger recombination, which represents a dominant recombination pathway for multiexcitons in NCs. Furthermore, strong Coulomb coupling between charge carriers leads to extremely efficient direct photogeneration of multiexcitons by single photons via carrier (or exciton) multiplication. This review focuses on spectral and dynamical properties of multiexcitons in semiconductor NCs. The specific topics discussed here include the structure of NC electronic states, spectral signatures of multiexcitons in transient absorption and photoluminescence, exciton-exciton interaction energies, Auger recombination, and carrier multiplication. This chapter also briefly reviews the implications of multiexciton effects for practical technologies, such as NC lasing and photovoltaics.
Type of Medium:
Online Resource
ISSN:
0066-426X
,
1545-1593
DOI:
10.1146/physchem.2007.58.issue-1
DOI:
10.1146/annurev.physchem.58.032806.104537
Language:
English
Publisher:
Annual Reviews
Publication Date:
2007
detail.hit.zdb_id:
1470474-2
