Abstract
This article reviews the mechanisms through which molecules adsorbed to the surfaces of semiconductor nanocrystals, quantum dots (QDs), influence the pathways for and dynamics of intra- and interband exciton relaxation in these nanostructures. In many cases, the surface chemistry of the QDs determines the competition between Auger relaxation and electronic-to-vibrational energy transfer in the intraband cooling of hot carriers, and between electron or hole-trapping processes and radiative recombination in relaxation of band-edge excitons. The latter competition determines the photoluminescence quantum yield of the nanocrystals, which is predictable through a set of mostly phenomenological models that link the surface coverage of ligands with specific chemical properties to the rate constants for nonradiative exciton decay.
| Original language | English |
|---|---|
| Pages (from-to) | 317-339 |
| Number of pages | 23 |
| Journal | Annual Review of Physical Chemistry |
| Volume | 65 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- Auger relaxation
- charge trapping
- electron-to-vibrational energy transfer
- surface chemistry
- transient absorption
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Medicine(all)
Cite this
The role of ligands in determining the exciton relaxation dynamics in semiconductor quantum dots. / Peterson, Mark D.; Cass, Laura C.; Harris, Rachel D.; Edme, Kedy; Sung, Kimberly; Weiss, Emily A.
In: Annual Review of Physical Chemistry, Vol. 65, 2014, p. 317-339.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The role of ligands in determining the exciton relaxation dynamics in semiconductor quantum dots
AU - Peterson, Mark D.
AU - Cass, Laura C.
AU - Harris, Rachel D.
AU - Edme, Kedy
AU - Sung, Kimberly
AU - Weiss, Emily A
PY - 2014
Y1 - 2014
N2 - This article reviews the mechanisms through which molecules adsorbed to the surfaces of semiconductor nanocrystals, quantum dots (QDs), influence the pathways for and dynamics of intra- and interband exciton relaxation in these nanostructures. In many cases, the surface chemistry of the QDs determines the competition between Auger relaxation and electronic-to-vibrational energy transfer in the intraband cooling of hot carriers, and between electron or hole-trapping processes and radiative recombination in relaxation of band-edge excitons. The latter competition determines the photoluminescence quantum yield of the nanocrystals, which is predictable through a set of mostly phenomenological models that link the surface coverage of ligands with specific chemical properties to the rate constants for nonradiative exciton decay.
AB - This article reviews the mechanisms through which molecules adsorbed to the surfaces of semiconductor nanocrystals, quantum dots (QDs), influence the pathways for and dynamics of intra- and interband exciton relaxation in these nanostructures. In many cases, the surface chemistry of the QDs determines the competition between Auger relaxation and electronic-to-vibrational energy transfer in the intraband cooling of hot carriers, and between electron or hole-trapping processes and radiative recombination in relaxation of band-edge excitons. The latter competition determines the photoluminescence quantum yield of the nanocrystals, which is predictable through a set of mostly phenomenological models that link the surface coverage of ligands with specific chemical properties to the rate constants for nonradiative exciton decay.
KW - Auger relaxation
KW - charge trapping
KW - electron-to-vibrational energy transfer
KW - surface chemistry
KW - transient absorption
UR - http://www.scopus.com/inward/record.url?scp=84897494061&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897494061&partnerID=8YFLogxK
U2 - 10.1146/annurev-physchem-040513-103649
DO - 10.1146/annurev-physchem-040513-103649
M3 - Article
VL - 65
SP - 317
EP - 339
JO - Annual Review of Physical Chemistry
JF - Annual Review of Physical Chemistry
SN - 0066-426X
ER -